{"pageNumber":"37","pageRowStart":"900","pageSize":"25","recordCount":184582,"records":[{"id":70273247,"text":"70273247 - 2025 - Variation and controls of sediment oxygen demand in backwater lakes of the Upper Mississippi River during winter","interactions":[],"lastModifiedDate":"2025-12-23T15:09:19.316964","indexId":"70273247","displayToPublicDate":"2025-09-17T08:02:00","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3301,"text":"River Research and Applications","active":true,"publicationSubtype":{"id":10}},"title":"Variation and controls of sediment oxygen demand in backwater lakes of the Upper Mississippi River during winter","docAbstract":"Many ecological processes affect the availability of winter dissolved oxygen (DO) concentrations in rivers, a key feature of overwintering fish habitat. Sediment oxygen demand (SOD) contributes to DO depletion, particularly during ice-covered periods, and may cause hypoxic conditions in backwater lakes, affecting the availability of suitable overwintering habitat. Understanding the drivers of SOD on habitat conditions during winter is critical for the management of the Upper Mississippi River System (UMRS). We measured SOD rates in three different habitat types (shallow, non-vegetated; deep, non-vegetated; and vegetated) within 12 backwater lakes in Pools 4, Pool 8, and Pool 13 of the UMRS in January and February 2022. Sediment physicochemical characteristics were measured to identify potential drivers of winter SOD rates. Measured SOD rates ranged from 0.04–0.44 g O2/(m2d) at in situ temperatures, and 0.14–1.46 g O2/(m2d) when corrected to 20°C. There were no statistically significant relations between in situ SOD and most sediment characteristics. SOD was positively associated with aquatic vegetation presence and negatively associated with sediment pH, water depth, flow velocity, and ice depth. SOD was typically higher at vegetated sites with lower flow velocity, with four of the five highest SOD rates measured at vegetated sites. Vegetation presence, depth, and flow velocity played greater roles in controlling SOD rates than sediment characteristics. Additionally, DO concentrations near the sediment–water interface at deep sites (> 1.5 m) were much lower than DO concentrations 0.2 m under the water surface, indicating that SOD was influencing DO concentrations and may be affecting overwintering habitat in backwater lakes.
","language":"English","publisher":"Wiley","doi":"10.1002/rra.70011","usgsCitation":"Perner, P.M., Kreiling, R.M., Jankowski, K.J., and Strauss, E.A., 2025, Variation and controls of sediment oxygen demand in backwater lakes of the Upper Mississippi River during winter: River Research and Applications, v. 41, no. 10, p. 2189-2204, https://doi.org/10.1002/rra.70011.","productDescription":"16 p.","startPage":"2189","endPage":"2204","ipdsId":"IP-170589","costCenters":[{"id":37947,"text":"Upper Midwest Water Science Center","active":true,"usgs":true}],"links":[{"id":498054,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/rra.70011","text":"Publisher Index Page"},{"id":497936,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Illinois, Iowa, Minnesota, Missouri, Wisconsin","otherGeospatial":"Upper Mississippi River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -93.10097042912157,\n 44.97281290065325\n ],\n [\n -91.759506701898,\n 43.740062945434715\n ],\n [\n -90.9674401636216,\n 42.01556148014882\n ],\n [\n -91.743596973701,\n 39.81261700824835\n ],\n [\n -90.48342253124173,\n 38.34168124893585\n ],\n [\n -89.22324808878244,\n 36.870745489623346\n ],\n [\n -90.81905145778899,\n 40.275434086550305\n ],\n [\n -89.87713786574906,\n 41.79816956524569\n ],\n [\n -90.01573449349698,\n 42.334520209936784\n ],\n [\n -91.1511012598934,\n 43.92329321891202\n ],\n [\n -92.65275956586878,\n 45.089302207190485\n ],\n [\n -93.10097042912157,\n 44.97281290065325\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"41","issue":"10","noUsgsAuthors":false,"publicationDate":"2025-09-17","publicationStatus":"PW","contributors":{"authors":[{"text":"Perner, Patrik Mathis 0000-0002-6142-518X","orcid":"https://orcid.org/0000-0002-6142-518X","contributorId":261675,"corporation":false,"usgs":true,"family":"Perner","given":"Patrik","email":"","middleInitial":"Mathis","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":952847,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kreiling, Rebecca M. 0000-0002-9295-4156","orcid":"https://orcid.org/0000-0002-9295-4156","contributorId":202193,"corporation":false,"usgs":true,"family":"Kreiling","given":"Rebecca","middleInitial":"M.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":952848,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jankowski, Kathi Jo 0000-0002-3292-4182","orcid":"https://orcid.org/0000-0002-3292-4182","contributorId":207429,"corporation":false,"usgs":true,"family":"Jankowski","given":"Kathi","email":"","middleInitial":"Jo","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":952849,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Strauss, Eric A. 0000-0002-3134-2535","orcid":"https://orcid.org/0000-0002-3134-2535","contributorId":364544,"corporation":false,"usgs":false,"family":"Strauss","given":"Eric","middleInitial":"A.","affiliations":[{"id":47908,"text":"University of Wisconsin - La Crosse","active":true,"usgs":false}],"preferred":false,"id":952850,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70272270,"text":"70272270 - 2025 - Hydrologic connectivity in floodplain systems: A multiscale review of concepts, metrics and management","interactions":[],"lastModifiedDate":"2025-11-20T16:06:54.982885","indexId":"70272270","displayToPublicDate":"2025-09-16T10:03:43","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1924,"text":"Hydrological Processes","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic connectivity in floodplain systems: A multiscale review of concepts, metrics and management","docAbstract":"Hydrologic connectivity (HC), particularly in floodplain systems, is pivotal in regulating ecosystem services by facilitating the movement of nutrients, sediments, chemicals, and biota. However, human interventions such as dam construction, levee installation, water management practices, and alterations in vegetation have significantly disrupted natural HC patterns globally. To provide a structured entry into the growing body of HC research, we conducted a systematic literature review of 1920 studies, analysing diverse definitions, influencing factors, quantification approaches, spatial and temporal scales, and management strategies. In addition to traditional review methods, our approach integrates keyword and cluster analysis to elucidate dominant research themes and trends across the literature. Our review reveals that the literature is heavily skewed towards research in North America and Europe (accounting for 72% of studies) and predominantly utilises field investigations, simulation modelling, and remote sensing integrated with geographic information systems. Although these methodologies have advanced our understanding, most studies focus on restricted spatial scales such as individual hillslopes, catchments, or stream networks and short temporal intervals, including single precipitation events or seasonal cycles. A narrow focus becomes a limitation when such studies do not contribute to broader efforts aimed at scaling insights across larger domains. These limitations highlight the potential benefits of innovative conceptual frameworks and quantification methods to better capture HC across broader environments and extended temporal scales. We conclude by discussing challenges in defining and quantifying floodplain HC and outlining potential future research directions to advance connectivity science and management, particularly in floodplain systems characterised by frequent hydrologic fluctuations, such as seasonal inundation and changing flow paths.
","language":"English","publisher":"Wiley","doi":"10.1002/hyp.70260","usgsCitation":"Hafez Ahmad, Miranda, L.E., Dunn, C.G., Melanie R. Boudreau, and Colvin, M.E., 2025, Hydrologic connectivity in floodplain systems: A multiscale review of concepts, metrics and management: Hydrological Processes, v. 39, no. 9, e70260, 23 p., https://doi.org/10.1002/hyp.70260.","productDescription":"e70260, 23 p.","ipdsId":"IP-177204","costCenters":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"links":[{"id":496691,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"39","issue":"9","noUsgsAuthors":false,"publicationDate":"2025-09-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Hafez Ahmad","contributorId":362594,"corporation":false,"usgs":false,"family":"Hafez Ahmad","affiliations":[{"id":17848,"text":"Mississippi State University","active":true,"usgs":false}],"preferred":false,"id":950631,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Miranda, Leandro E. 0000-0002-2138-7924 smiranda@usgs.gov","orcid":"https://orcid.org/0000-0002-2138-7924","contributorId":531,"corporation":false,"usgs":true,"family":"Miranda","given":"Leandro","email":"smiranda@usgs.gov","middleInitial":"E.","affiliations":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":950632,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dunn, Corey Garland 0000-0002-7102-2165","orcid":"https://orcid.org/0000-0002-7102-2165","contributorId":288691,"corporation":false,"usgs":true,"family":"Dunn","given":"Corey","email":"","middleInitial":"Garland","affiliations":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":950633,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Melanie R. Boudreau","contributorId":362597,"corporation":false,"usgs":false,"family":"Melanie R. Boudreau","affiliations":[{"id":17848,"text":"Mississippi State University","active":true,"usgs":false}],"preferred":false,"id":950634,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Colvin, Michael E. 0000-0002-6581-4764","orcid":"https://orcid.org/0000-0002-6581-4764","contributorId":331490,"corporation":false,"usgs":true,"family":"Colvin","given":"Michael","email":"","middleInitial":"E.","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":950735,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70271379,"text":"sir20255074 - 2025 - Using satellite imagery and soil data to understand occurrences and migration of soil conditions harmful to archaeological sites on Jamestown Island, Virginia","interactions":[],"lastModifiedDate":"2026-02-03T15:25:33.505229","indexId":"sir20255074","displayToPublicDate":"2025-09-16T10:00:00","publicationYear":"2025","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2025-5074","displayTitle":"Using Satellite Imagery and Soil Data To Understand Occurrences and Migration of Soil Conditions Harmful to Archaeological Sites on Jamestown Island, Virginia","title":"Using satellite imagery and soil data to understand occurrences and migration of soil conditions harmful to archaeological sites on Jamestown Island, Virginia","docAbstract":"Many know Jamestown Island, Virginia, hereafter referred to as “the Island,” located near the mouth of the James River into the Chesapeake Bay, as the home of the first permanent English settlement in North America. However, the Island is home to 15,000 years’ worth of cultural artifacts and archaeological sites. In addition to its rich history, the Island is home to a variety of native plants and animals, including many rare, threatened, and endangered species. Preserving historical and natural resources is part of Colonial National Historic Park’s (COLO) enabling legislation. To this end, COLO has been seeking data to inform management decisions on how to prioritize resources to preserve archaeological sites and anticipate changes to natural systems from sea-level rise and other effects of climate change. The U.S. Geological Survey (USGS), in partnership with COLO, collected and analyzed data to help determine soil conditions detrimental to archaeological sites across the Island using a combination of soil samples and assessments of vegetative health as a proxy for soil conditions. This study combined normalized difference vegetative index raster grids spanning 8 years, 2010 to 2018, and soil data from 50 sites sampled in dry (June 2021) and wet months (March 2022) at two different soil horizons to investigate potential hazards to plant health and corrosive conditions in the unsaturated subsurface. The data suggest that access to the James River drives soil pH and soil conductivity. Areas of the Island that are subject to frequent inundation were observed to have both higher soil conductivity (as high as 4,845 millisiemens per meter [mS/m]) and lower pH (as low as 3.84). Higher soil conductivity, or salinity, and more acidity create corrosive environment, which can destroy buried artifacts and are detrimental to vegetative health. These conditions were not limited to the edges of the Island, like Black Point. Inland locations, such as the Pitch and Tar Swamp, were observed to have some of the highest conductivity values, which were likely caused by from a combination of inflow of James River water along Back Creek into the Pitch and Tar Swamp and proximity to the Visitor Center and other high-traffic areas of the Island. A difference of normalized difference vegetative index values from 2010 to 2018 raster grid appears to support this, showing an apparent loss of vegetative health in marsh grass in the Pitch and Tar Swamp. These data may inform COLO about areas of the Island that are currently most threatened by corrosive conditions and how those conditions are likely to migrate in the future.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20255074","isbn":"978-1-4113-4629-1","collaboration":"Prepared in cooperation with the National Park Service","usgsCitation":"Caldwell, S.H., 2025, Using satellite imagery and soil data to understand occurrences and migration of soil conditions harmful to archaeological sites on Jamestown Island, Virginia (ver. 1.1, November 2025): U.S. Geological Survey Scientific Investigations Report 2025–5074, 22 p., https://doi.org/10.3133/sir20255074.","productDescription":"Report: vii, 22 p.; Data Release","numberOfPages":"22","onlineOnly":"N","additionalOnlineFiles":"N","ipdsId":"IP-167335","costCenters":[{"id":37280,"text":"Virginia and West Virginia Water Science Center ","active":true,"usgs":true}],"links":[{"id":497790,"rank":8,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_118874.htm"},{"id":496292,"rank":7,"type":{"id":25,"text":"Version History"},"url":"https://pubs.usgs.gov/sir/2025/5074/versionHist.txt","size":"632 B","linkFileType":{"id":2,"text":"txt"}},{"id":495295,"rank":6,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P13J32J4","text":"USGS data release","linkHelpText":"Satellite imagery products from 2010, 2011, 2018 and soil data from 2021–22 on Jamestown Island, Va."},{"id":495294,"rank":5,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/sir/2025/5074/images/"},{"id":495293,"rank":4,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/sir/2025/5074/sir20255074.XML","linkFileType":{"id":8,"text":"xml"},"description":"SIR 2025-5074 XML"},{"id":495292,"rank":3,"type":{"id":39,"text":"HTML Document"},"url":"https://pubs.usgs.gov/publication/sir20255074/full","linkFileType":{"id":5,"text":"html"},"description":"SIR 2025-5074 HTML"},{"id":495291,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/sir/2025/5074/sir20255074.pdf","text":"Report","size":"4.19 MB","linkFileType":{"id":1,"text":"pdf"},"description":"SIR 2025-5074 PDF"},{"id":495290,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/sir/2025/5074/coverthb3.jpg"}],"country":"United States","state":"Virginia","otherGeospatial":"Jamestown Island","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -76.785,\n 37.22\n ],\n [\n -76.785,\n 37.19007232242731\n ],\n [\n -76.73168289008015,\n 37.19007232242731\n ],\n [\n -76.73168289008015,\n 37.22\n ],\n [\n -76.785,\n 37.22\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","edition":"Version 1.0: September 16, 2025; Version 1.1: September 30, 2025","contact":"Director, Virginia and West Virginia Water Science Center
U.S. Geological Survey
1730 East Parham Road
Richmond, Virginia 23228
","tableOfContents":"- Abstract
- Introduction
- Purpose and Scope
- Study Area Description
- Methods
- Results
- Summary
- Acknowledgments
- References Cited
","publishingServiceCenter":{"id":10,"text":"Baltimore PSC"},"publishedDate":"2025-09-16","revisedDate":"2025-11-17","noUsgsAuthors":false,"publicationDate":"2025-09-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Caldwell, Samuel H. 0000-0002-4444-7002","orcid":"https://orcid.org/0000-0002-4444-7002","contributorId":292520,"corporation":false,"usgs":true,"family":"Caldwell","given":"Samuel","email":"","middleInitial":"H.","affiliations":[{"id":37280,"text":"Virginia and West Virginia Water Science Center ","active":true,"usgs":true}],"preferred":true,"id":948327,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70271504,"text":"70271504 - 2025 - To heal or not to heal?: 2. The moment-recurrence time behavior of repeating earthquakes in the 2011 Prague, Oklahoma aftershock sequence is consistent with laboratory healing rates","interactions":[],"lastModifiedDate":"2025-09-18T14:38:35.152792","indexId":"70271504","displayToPublicDate":"2025-09-16T09:27:03","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":7501,"text":"JGR Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"To heal or not to heal?: 2. The moment-recurrence time behavior of repeating earthquakes in the 2011 Prague, Oklahoma aftershock sequence is consistent with laboratory healing rates","docAbstract":"The timing and failure conditions of an earthquake are governed by the interplay between fault reloading and restrengthening. The moment-recurrence time behavior of repeating earthquakes can give observational estimates of fault healing rates; however, it is difficult to link these observed healing rates to laboratory studies of frictional healing in part because of uncertainty in lithology. Here, we study the 2011 Prague earthquake sequence, which includes repeating earthquakes in the Arbuckle group and the granitic basement, and compare them to laboratory experiments on samples of the Arbuckle and Troy granite (representative of the basement rock) (Okamoto et al., 2025, https://doi.org/10.1029/2024JB030573). We find three spatially distinct groups of repeating earthquakes with different moment-recurrence behavior: (a) constant moment-recurrence time in the Arbuckle group, (b) scattered moment-recurrence time at the intersection of the foreshock-mainshock fault in the granitic basement, and (c) moment-predictable behavior outside of the foreshock-mainshock fault intersection also in the granitic basement. Our observation of stagnant healing for repeating sequences in the Arbuckle group is consistent with laboratory observations of low healing rates for moderately high pore fluid pressures in Arbuckle samples. For the moment-predictable group, the source radius that is required in order to match healing rates is consistent with source radius estimations when taking into account reasonable attenuation of the P-pulse width. Overall, we observe diverse healing behaviors in the seismic families that are consistent with laboratory healing rates, providing seismic evidence that contact-scale frictional mechanisms are relevant to large-scale earthquake dynamics.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2024JB030548","usgsCitation":"Okamoto, K., Savage, H., Cochran, E.S., Brodsky, E., and Abercrombie, R., 2025, To heal or not to heal?: 2. The moment-recurrence time behavior of repeating earthquakes in the 2011 Prague, Oklahoma aftershock sequence is consistent with laboratory healing rates: JGR Solid Earth, v. 130, no. 9, e2024JB030548, 18 p., https://doi.org/10.1029/2024JB030548.","productDescription":"e2024JB030548, 18 p.","ipdsId":"IP-172199","costCenters":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"links":[{"id":495743,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2024jb030548","text":"Publisher Index Page"},{"id":495707,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Oklahoma","city":"Prague","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -96.7,\n 35.6\n ],\n [\n -96.9,\n 35.6\n ],\n [\n -96.9,\n 35.4\n ],\n [\n -96.7,\n 35.4\n ],\n [\n -96.7,\n 35.6\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"130","issue":"9","noUsgsAuthors":false,"publicationDate":"2025-09-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Okamoto, Kristina","contributorId":296586,"corporation":false,"usgs":false,"family":"Okamoto","given":"Kristina","email":"","affiliations":[{"id":6948,"text":"UC Santa Cruz","active":true,"usgs":false}],"preferred":false,"id":948974,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Savage, Heather","contributorId":296588,"corporation":false,"usgs":false,"family":"Savage","given":"Heather","affiliations":[{"id":6948,"text":"UC Santa Cruz","active":true,"usgs":false}],"preferred":false,"id":948975,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Cochran, Elizabeth S. 0000-0003-2485-4484 ecochran@usgs.gov","orcid":"https://orcid.org/0000-0003-2485-4484","contributorId":2025,"corporation":false,"usgs":true,"family":"Cochran","given":"Elizabeth","email":"ecochran@usgs.gov","middleInitial":"S.","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"preferred":true,"id":948976,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Brodsky, Emily","contributorId":299735,"corporation":false,"usgs":false,"family":"Brodsky","given":"Emily","affiliations":[{"id":27155,"text":"University of California Santa Cruz","active":true,"usgs":false}],"preferred":false,"id":948977,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Abercrombie, Rachel E.","contributorId":293131,"corporation":false,"usgs":false,"family":"Abercrombie","given":"Rachel E.","affiliations":[{"id":7208,"text":"Department of Earth and Environment, Boston University","active":true,"usgs":false}],"preferred":false,"id":948978,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70271923,"text":"70271923 - 2025 - Environmental drivers of Greater Sage-grouse population trends over 25 years in Idaho, USA","interactions":[],"lastModifiedDate":"2025-09-24T15:36:30.070481","indexId":"70271923","displayToPublicDate":"2025-09-16T08:31:12","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1475,"text":"Ecosphere","active":true,"publicationSubtype":{"id":10}},"title":"Environmental drivers of Greater Sage-grouse population trends over 25 years in Idaho, USA","docAbstract":"Greater Sage-grouse (Centrocercus urophasianus) populations have been in decline for decades across much of the US Intermountain West. However, findings from 25 years of lek counts in Idaho indicate that some populations are stable or even increasing. After accounting for potential biases in past lek count data, we sought to explain the variability in population trends among all 70 lek clusters (i.e., populations) we identified in the state. For each population, we identified lek count troughs, or low-point years, that occurred between the mid-1990s and 2021 and used a regression slope of those abundance low points to quantify each population's trend over the 25-year time span. We related the 70 populations' slopes to climate, fire, topographic, vegetation, and landcover variables. Our analyses revealed that populations with negative trends tend to occur toward the ends of climate gradients (i.e., extremes of occupied habitats) and in locations with more wildfire, agriculture, and riparian landcover. Populations with positive trends generally occur in landscapes toward the middle of the climate gradient, with high amounts of low sagebrush (Artemisia arbuscula) landcover and intermediate amounts of riparian and agricultural landcover. Post hoc analysis indicated that the latter two drivers were strongly associated with high raven occupancy rates, which may contribute to the negative sage-grouse population trends we observed in areas with high riparian or agricultural landcover. When modeled separately for different regions however, various region-specific drivers were identified, including tree cover, annual herbaceous cover, and human development. This information can help guide sage-grouse habitat management decisions and set expectations for population recovery, given the diversity of habitats occupied by the species and the cyclic nature of sage-grouse populations.
","language":"English","publisher":"Ecological Society of America","doi":"10.1002/ecs2.70331","usgsCitation":"Arkle, R.S., Pilliod, D.S., Jeffries, M.I., Welty, J.L., Moser, A., Ellsworth, E.A., and Major, D.J., 2025, Environmental drivers of Greater Sage-grouse population trends over 25 years in Idaho, USA: Ecosphere, v. 16, no. 9, e70331, 20 p., https://doi.org/10.1002/ecs2.70331.","productDescription":"e70331, 20 p.","ipdsId":"IP-156975","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":496159,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/ecs2.70331","text":"Publisher Index Page"},{"id":496016,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Idaho","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -117.51050707303654,\n 44.996426283603455\n ],\n [\n -117.51050707303654,\n 41.98536993997118\n ],\n [\n -110.93279337585523,\n 41.98536993997118\n ],\n [\n -110.93279337585523,\n 44.996426283603455\n ],\n [\n -117.51050707303654,\n 44.996426283603455\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"16","issue":"9","noUsgsAuthors":false,"publicationDate":"2025-09-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Arkle, Robert S. 0000-0003-3021-1389","orcid":"https://orcid.org/0000-0003-3021-1389","contributorId":218006,"corporation":false,"usgs":true,"family":"Arkle","given":"Robert","middleInitial":"S.","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":true,"id":949392,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pilliod, David S. 0000-0003-4207-3518","orcid":"https://orcid.org/0000-0003-4207-3518","contributorId":216342,"corporation":false,"usgs":true,"family":"Pilliod","given":"David","middleInitial":"S.","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":true,"id":949393,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jeffries, Michelle I. 0000-0003-1146-1331","orcid":"https://orcid.org/0000-0003-1146-1331","contributorId":202734,"corporation":false,"usgs":true,"family":"Jeffries","given":"Michelle","middleInitial":"I.","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":true,"id":949394,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Welty, Justin L. 0000-0001-7829-7324 jwelty@usgs.gov","orcid":"https://orcid.org/0000-0001-7829-7324","contributorId":216345,"corporation":false,"usgs":true,"family":"Welty","given":"Justin","email":"jwelty@usgs.gov","middleInitial":"L.","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":true,"id":949395,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Moser, Ann","contributorId":201657,"corporation":false,"usgs":false,"family":"Moser","given":"Ann","affiliations":[{"id":36224,"text":"Idaho Department of Fish and Game","active":true,"usgs":false}],"preferred":false,"id":949396,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Ellsworth, Ethan A.","contributorId":201653,"corporation":false,"usgs":false,"family":"Ellsworth","given":"Ethan","email":"","middleInitial":"A.","affiliations":[{"id":7217,"text":"Bureau of Land Management","active":true,"usgs":false}],"preferred":false,"id":949397,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Major, Donald J.","contributorId":361757,"corporation":false,"usgs":false,"family":"Major","given":"Donald","middleInitial":"J.","affiliations":[{"id":7217,"text":"Bureau of Land Management","active":true,"usgs":false}],"preferred":false,"id":949398,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}}
,{"id":70272260,"text":"70272260 - 2025 - Spatial regimes provide ample early warning of tipping points","interactions":[],"lastModifiedDate":"2025-11-20T15:25:12.703711","indexId":"70272260","displayToPublicDate":"2025-09-16T08:21:56","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5217,"text":"Advances in Ecological Research","active":true,"publicationSubtype":{"id":10}},"title":"Spatial regimes provide ample early warning of tipping points","docAbstract":"Accelerating global change is a hallmark of the Anthropocene, and the interaction of rapid change in climate, land use and land cover makes understanding the response of social-ecological systems to global change difficult to predict. Global change directly and indirectly affects both social-ecological systems and the landscapes in which they are embedded. Spatial heterogeneity in the location, manifestation of, and responses to global change makes spatially explicit approaches to management and conservation necessary. Spatial regimes, a concept derived from resilience theory, are at the forefront of attempts to operationalize and quantify resilience of dynamic landscapes. Spatial regimes are defined as dynamic landscape units that are shaped by a self-organizing set of processes and structures. They have identifiable spatial extents with discrete boundaries at a given scale that exhibit relative homogeneity in process, structure and composition maintained by feedback mechanisms. Here, we describe the concept of, evidence for, and applications of spatial regimes and how spatial regimes relate to scale and telecoupling of change across social-ecological systems. We emphasize the utility of the concept as an early warning of regime change, one that can provide ample early warning. We discuss methods that can be used to detect spatial regimes and uses of the concept for understanding and managing the spatio-temporal response of social-ecological systems to global change.
","language":"English","publisher":"Elsevier","doi":"10.1016/bs.aecr.2025.08.001","usgsCitation":"Allen, C.R., Garmestani, A., Angeler, D.G., Gunderson, L., Roberts, C.P., Sundstrom, S., Uden, D.R., and Liu, J., 2025, Spatial regimes provide ample early warning of tipping points: Advances in Ecological Research, v. 73, p. 151-167, https://doi.org/10.1016/bs.aecr.2025.08.001.","productDescription":"17 p.","startPage":"151","endPage":"167","ipdsId":"IP-179805","costCenters":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"links":[{"id":496683,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"73","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Allen, Craig R.","contributorId":362564,"corporation":false,"usgs":false,"family":"Allen","given":"Craig","middleInitial":"R.","affiliations":[{"id":86532,"text":"University of Nebraska – Lincoln","active":true,"usgs":false}],"preferred":false,"id":950596,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Garmestani, Ahjond","contributorId":362565,"corporation":false,"usgs":false,"family":"Garmestani","given":"Ahjond","affiliations":[{"id":6914,"text":"U.S. Environmental Protection Agency","active":true,"usgs":false}],"preferred":false,"id":950597,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Angeler, David G.","contributorId":362566,"corporation":false,"usgs":false,"family":"Angeler","given":"David","middleInitial":"G.","affiliations":[{"id":86532,"text":"University of Nebraska – Lincoln","active":true,"usgs":false}],"preferred":false,"id":950598,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gunderson, Lance","contributorId":362567,"corporation":false,"usgs":false,"family":"Gunderson","given":"Lance","affiliations":[{"id":40432,"text":"Emory University","active":true,"usgs":false}],"preferred":false,"id":950599,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Roberts, Caleb Powell 0000-0002-8716-0423","orcid":"https://orcid.org/0000-0002-8716-0423","contributorId":288567,"corporation":false,"usgs":true,"family":"Roberts","given":"Caleb","email":"","middleInitial":"Powell","affiliations":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":950600,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Sundstrom, S.M.","contributorId":362568,"corporation":false,"usgs":false,"family":"Sundstrom","given":"S.M.","affiliations":[{"id":86532,"text":"University of Nebraska – Lincoln","active":true,"usgs":false}],"preferred":false,"id":950601,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Uden, Daniel R.","contributorId":362569,"corporation":false,"usgs":false,"family":"Uden","given":"Daniel","middleInitial":"R.","affiliations":[{"id":86532,"text":"University of Nebraska – Lincoln","active":true,"usgs":false}],"preferred":false,"id":950602,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Liu, Jianguo 0000-0002-6058-5472","orcid":"https://orcid.org/0000-0002-6058-5472","contributorId":202620,"corporation":false,"usgs":false,"family":"Liu","given":"Jianguo","email":"","affiliations":[{"id":6601,"text":"Michigan State University","active":true,"usgs":false}],"preferred":false,"id":950603,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}}
,{"id":70272213,"text":"70272213 - 2025 - Sand provenance boundary in the Mu Us Sandy Land of northern China","interactions":[],"lastModifiedDate":"2025-11-19T15:16:22.762176","indexId":"70272213","displayToPublicDate":"2025-09-16T08:10:17","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1801,"text":"Geomorphology","active":true,"publicationSubtype":{"id":10}},"title":"Sand provenance boundary in the Mu Us Sandy Land of northern China","docAbstract":"Desert dunes are often assumed to have uniform mineral compositions due to extensive mixing during lateral transport, which complicates provenance studies. The Mu Us Sandy Land in north-central China, near the East Asian summer monsoon precipitation boundary, experiences a wetter climate than most deserts. Climate wetting as a result of a warming climate, and the ‘Sand Control Project’ implemented by the Chinese government to decrease the lateral movement of sand dunes in this area provide an opportunity to study surface processes of sand production and transport. Previous studies using zircon U![\"single](\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\")
Pb geochronology and heavy mineral composition indicate distinct sand sources for the Mu Us Sandy Land: local basement-derived middle Yellow River sediments and recycled dried-up lacustrine sediments for the eastern part, and northeastern Tibetan Plateau-derived upper Yellow River sediments for the western part. However, zircons and heavy minerals only represent trace amounts of the bulk mineralogy within a sand dune, so broader provenance analysis targeting common minerals is essential. We focus on the area near the proposed provenance difference boundary between the western and eastern Mu Us Sandy Land, using comprehensive sampling and provenance techniques to confirm distinct provenance characteristics and delineate the provenance boundary. Our findings reveal that sand from most of the Mu Us Sandy Land originated from the erosion of local basement by the middle Yellow River and recycled local dried-up lacustrine sediments, whereas the southwestern corner and the neighboring western-central Chinese Loess Plateau received sediments from the distal northeastern Tibetan Plateau.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.geomorph.2025.110005","usgsCitation":"Li, M., Nie, J., Zhang, H., Pfaff, K.I., and Zhang, Z., 2025, Sand provenance boundary in the Mu Us Sandy Land of northern China: Geomorphology, v. 490, 110005, 12 p., https://doi.org/10.1016/j.geomorph.2025.110005.","productDescription":"110005, 12 p.","ipdsId":"IP-174615","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":496631,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"China","otherGeospatial":"Mu Us Sandy Land","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n 99.15372125788178,\n 42.092298158578245\n ],\n [\n 99.15372125788178,\n 37.26174832930788\n ],\n [\n 107.2705734716717,\n 37.26174832930788\n ],\n [\n 107.2705734716717,\n 42.092298158578245\n ],\n [\n 99.15372125788178,\n 42.092298158578245\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"490","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Li, Maotong 0009-0002-9753-6540","orcid":"https://orcid.org/0009-0002-9753-6540","contributorId":362427,"corporation":false,"usgs":false,"family":"Li","given":"Maotong","affiliations":[{"id":86518,"text":"Key Laboratory of Western China’s Environment Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China","active":true,"usgs":false}],"preferred":false,"id":950456,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Nie, Junsheng 0000-0002-1700-7116","orcid":"https://orcid.org/0000-0002-1700-7116","contributorId":362428,"corporation":false,"usgs":false,"family":"Nie","given":"Junsheng","affiliations":[{"id":86519,"text":"School of Earth Sciences, Lanzhou University, Lanzhou 730000, China","active":true,"usgs":false}],"preferred":false,"id":950457,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Zhang, Haobo 0000-0003-0086-4856","orcid":"https://orcid.org/0000-0003-0086-4856","contributorId":362429,"corporation":false,"usgs":false,"family":"Zhang","given":"Haobo","affiliations":[{"id":86519,"text":"School of Earth Sciences, Lanzhou University, Lanzhou 730000, China","active":true,"usgs":false}],"preferred":false,"id":950458,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Pfaff, Katharina I. 0000-0002-6605-2722","orcid":"https://orcid.org/0000-0002-6605-2722","contributorId":362430,"corporation":false,"usgs":true,"family":"Pfaff","given":"Katharina","middleInitial":"I.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":950459,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Zhang, Zengjie 0000-0001-7627-9480","orcid":"https://orcid.org/0000-0001-7627-9480","contributorId":362431,"corporation":false,"usgs":false,"family":"Zhang","given":"Zengjie","affiliations":[{"id":86521,"text":"Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Zhuhai, China","active":true,"usgs":false}],"preferred":false,"id":950460,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70272037,"text":"70272037 - 2025 - Warming induces unexpectedly high soil respiration in a wet tropical forest","interactions":[],"lastModifiedDate":"2025-11-13T15:05:02.373977","indexId":"70272037","displayToPublicDate":"2025-09-16T07:55:10","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2842,"text":"Nature Communications","active":true,"publicationSubtype":{"id":10}},"title":"Warming induces unexpectedly high soil respiration in a wet tropical forest","docAbstract":"Tropical forests are a dominant regulator of the global carbon cycle, exchanging more carbon dioxide with the atmosphere than any other terrestrial biome. Climate models predict unprecedented climatic warming in tropical regions in the coming decades; however, in situ field warming studies are severely lacking in tropical forests. Here we present results from an in situ warming experiment in Puerto Rico, where soil respiration responses to +4 oC warming were assessed half-hourly for a year. Soil respiration rates were 42-204% higher in warmed relative to ambient plots, representing some of the highest soil respiration rates reported for any terrestrial ecosystem. While respiration rates were significantly higher in the warmed plots, the temperature sensitivity (Q10) was 71.7% lower, pointing to a mechanistic shift. Even with reduced Q10, if observed soil respiration rates persist in a warmer world, the feedback to future climate could be considerably greater than previously predicted or observed.
","language":"English","publisher":"Nature Portfolio","doi":"10.1038/s41467-025-62065-6","usgsCitation":"Wood, T.E., Tucker, C., Alonso-Rodríguez, A.M., Loza, M.I., Grullón-Penkova, I.F., Cavaleri, M.A., O'Connell, C.S., and Reed, S.C., 2025, Warming induces unexpectedly high soil respiration in a wet tropical forest: Nature Communications, v. 16, 8222, 9 p., https://doi.org/10.1038/s41467-025-62065-6.","productDescription":"8222, 9 p.","ipdsId":"IP-117238","costCenters":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"links":[{"id":496418,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1038/s41467-025-62065-6","text":"Publisher Index Page"},{"id":496399,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Puerto Rico","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -67.33248602902812,\n 18.57253360250462\n ],\n [\n -67.33248602902812,\n 17.89902135327496\n ],\n [\n -65.21418202034315,\n 17.89902135327496\n ],\n [\n -65.21418202034315,\n 18.57253360250462\n ],\n [\n -67.33248602902812,\n 18.57253360250462\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"16","noUsgsAuthors":false,"publicationDate":"2025-09-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Wood, Tana E.","contributorId":362002,"corporation":false,"usgs":false,"family":"Wood","given":"Tana","middleInitial":"E.","affiliations":[{"id":86414,"text":"USDA Forest Service International Institute of Tropical Forestry, Río Piedras, Puerto Rico, 00926, USA","active":true,"usgs":false}],"preferred":false,"id":949799,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tucker, Colin Lee 0000-0002-4539-7780","orcid":"https://orcid.org/0000-0002-4539-7780","contributorId":292579,"corporation":false,"usgs":false,"family":"Tucker","given":"Colin Lee","affiliations":[{"id":62942,"text":"U.S. Geological Survey, Southwest Biological Science Center, Moab, UT; US Forest Service, Northern Research Station, Houghton, MI","active":true,"usgs":false}],"preferred":false,"id":949800,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Alonso-Rodríguez, Aura M.","contributorId":362003,"corporation":false,"usgs":false,"family":"Alonso-Rodríguez","given":"Aura","middleInitial":"M.","affiliations":[{"id":86414,"text":"USDA Forest Service International Institute of Tropical Forestry, Río Piedras, Puerto Rico, 00926, USA","active":true,"usgs":false}],"preferred":false,"id":949801,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Loza, M. Isabel","contributorId":362004,"corporation":false,"usgs":false,"family":"Loza","given":"M.","middleInitial":"Isabel","affiliations":[{"id":86415,"text":"Center for Tree Science, Morton Arboretum, Lisle, IL 60532 USA","active":true,"usgs":false}],"preferred":false,"id":949802,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Grullón-Penkova, Iana F.","contributorId":362005,"corporation":false,"usgs":false,"family":"Grullón-Penkova","given":"Iana","middleInitial":"F.","affiliations":[{"id":86414,"text":"USDA Forest Service International Institute of Tropical Forestry, Río Piedras, Puerto Rico, 00926, USA","active":true,"usgs":false}],"preferred":false,"id":949804,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Cavaleri, Molly A.","contributorId":362006,"corporation":false,"usgs":false,"family":"Cavaleri","given":"Molly","middleInitial":"A.","affiliations":[{"id":86416,"text":"College of Forest Resources & Environmental Science, Michigan Technological University, Houghton, Michigan, 49931, USA","active":true,"usgs":false}],"preferred":false,"id":949805,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"O'Connell, Christine S.","contributorId":362007,"corporation":false,"usgs":false,"family":"O'Connell","given":"Christine","middleInitial":"S.","affiliations":[{"id":86417,"text":"Department of Environmental Studies, Macalester College, St. Paul, Minnesota, 55105, USA","active":true,"usgs":false}],"preferred":false,"id":949806,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Reed, Sasha C. 0000-0002-8597-8619 screed@usgs.gov","orcid":"https://orcid.org/0000-0002-8597-8619","contributorId":217604,"corporation":false,"usgs":true,"family":"Reed","given":"Sasha","email":"screed@usgs.gov","middleInitial":"C.","affiliations":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"preferred":true,"id":949807,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}}
,{"id":70272995,"text":"70272995 - 2025 - Model‐based decomposition of spatially varying temporal shifts in seasonal streamflow across north temperate US rivers.","interactions":[],"lastModifiedDate":"2025-12-15T14:20:44.203219","indexId":"70272995","displayToPublicDate":"2025-09-16T07:54:44","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Model‐based decomposition of spatially varying temporal shifts in seasonal streamflow across north temperate US rivers.","docAbstract":"Anthropogenically forced climate shifts disrupt the seasonal behavior of climatic and hydrologic processes. The seasonality of streamflow has significant implications for the ecology of riverine ecosystems and for meeting societal demands for water resources. We develop a hierarchical Bayesian model of daily streamflow to quantify how the shape of annual hydrographs are changing and to evaluate temporal trends in model-based hydrologic indices related to flow timing and magnitude shifts. We apply this model to 1,112 gages across the Northern US over the years 1965–2022. We identify large-scale patterns in temporal changes to streamflow profiles that are consistent with regional changes in hydroclimate, including decreasing seasonal flow variability in the Pacific Northwest and increasing winter flows in the northeastern United States. Within these regions we also observe fine-scale heterogeneity in streamflow timing and magnitude shifts, both of which have potentially significant implications for riverine ecosystem function and the ecosystem services they provide.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2024wr039500","usgsCitation":"Collins, K.M., Schliep, E.M., Wagner, T., and Wikle, C.K., 2025, Model‐based decomposition of spatially varying temporal shifts in seasonal streamflow across north temperate US rivers.: Water Resources Research, v. 61, no. 9, e2024WR039500, 18 p., https://doi.org/10.1029/2024wr039500.","productDescription":"e2024WR039500, 18 p.","ipdsId":"IP-168920","costCenters":[{"id":199,"text":"Coop Res Unit Leetown","active":true,"usgs":true}],"links":[{"id":497714,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2024wr039500","text":"Publisher Index Page"},{"id":497463,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"northern United States","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -125.3458881096503,\n 49.29487267098142\n ],\n [\n -124.25341557040164,\n 42.38037865705249\n ],\n [\n -102.843031226844,\n 40.798858382917174\n ],\n [\n -102.32686478374309,\n 37.18541829571534\n ],\n [\n -93.79657291209023,\n 36.66945873456485\n ],\n [\n -90.39402222420446,\n 36.67882840785393\n ],\n [\n -82.35133965032877,\n 36.98587435527764\n ],\n [\n -75.04054116668894,\n 39.21009303966319\n ],\n [\n -68.1268180477979,\n 47.34769099450737\n ],\n [\n -80.2238519745004,\n 46.533866149748945\n ],\n [\n -91.9752488122572,\n 49.10266455472649\n ],\n [\n -125.3458881096503,\n 49.29487267098142\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"61","issue":"9","noUsgsAuthors":false,"publicationDate":"2025-09-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Collins, Kevin M.","contributorId":363830,"corporation":false,"usgs":false,"family":"Collins","given":"Kevin","middleInitial":"M.","affiliations":[{"id":7091,"text":"North Carolina State University","active":true,"usgs":false}],"preferred":false,"id":952061,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schliep, Erin M.","contributorId":363831,"corporation":false,"usgs":false,"family":"Schliep","given":"Erin","middleInitial":"M.","affiliations":[{"id":7091,"text":"North Carolina State University","active":true,"usgs":false}],"preferred":false,"id":952062,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wagner, Tyler 0000-0003-1726-016X twagner@usgs.gov","orcid":"https://orcid.org/0000-0003-1726-016X","contributorId":218091,"corporation":false,"usgs":true,"family":"Wagner","given":"Tyler","email":"twagner@usgs.gov","affiliations":[{"id":199,"text":"Coop Res Unit Leetown","active":true,"usgs":true}],"preferred":true,"id":952063,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wikle, Christopher K.","contributorId":363836,"corporation":false,"usgs":false,"family":"Wikle","given":"Christopher","middleInitial":"K.","affiliations":[{"id":6754,"text":"University of Missouri","active":true,"usgs":false}],"preferred":false,"id":952064,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70272443,"text":"70272443 - 2025 - Potential for hydroacoustic technology to describe physical habitat for imperilled native freshwater mussels","interactions":[],"lastModifiedDate":"2025-11-21T19:16:54.700022","indexId":"70272443","displayToPublicDate":"2025-09-15T12:08:13","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1447,"text":"Ecohydrology","active":true,"publicationSubtype":{"id":10}},"title":"Potential for hydroacoustic technology to describe physical habitat for imperilled native freshwater mussels","docAbstract":"The lack of information on what constitutes suitable habitat for native freshwater mussels can limit restoration efforts. While many species reside in silt–sand–gravel substrates, species such as the Spectaclecase (Cumberlandia monodonta) and Salamander (Simpsonaias ambigua) mussels are thought to be associated with rock structures (e.g., wing dams and rock outcrops) in rivers. Our objective was to assess if hydroacoustic technology could be used to quantify physical habitat features for C. monodonta and S. ambigua. Multibeam echosounder, acoustic Doppler current profiler, sidescan sonar and underwater videography were used to quantify water depth, substrate hardness, bed roughness and bed slope of the riverbed, water velocity, shear velocity and the degree of rock clustering at six sites in the Saint Croix River, Minnesota. The sites varied in type of rock structures and relative abundances of both species. The strength of the associations among physical habitat features and mussel abundance was weak; R2 values were typically < 0.5. However, species-specific differences in microhabitat were observed. For example, C. monodonta was typically observed at sites with higher velocity and shear velocity compared to S. ambigua. Mussel abundance was greatest at sites that contained crevices of sand surrounded by boulders and bedrock. Future refinements in hydroacoustic methods and post-processing computations could improve predictions. Information on habitat features from occupied and unoccupied sites could help resource managers characterize existing occupied habitats, identify potential reintroduction areas and implement restoration programmes.
","language":"English","publisher":"Wiley","doi":"10.1002/eco.70081","usgsCitation":"Hanson, J.L., Stone, J., Kitchel, L., Weinzinger, J., and Newton, T.J., 2025, Potential for hydroacoustic technology to describe physical habitat for imperilled native freshwater mussels: Ecohydrology, v. 18, no. 6, e70081, 15 p., https://doi.org/10.1002/eco.70081.","productDescription":"e70081, 15 p.","ipdsId":"IP-160742","costCenters":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"links":[{"id":496793,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Minnesota, Wisconsin","otherGeospatial":"Saint Croix River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -92.62547203487303,\n 45.45770852010466\n ],\n [\n -92.77823906523427,\n 45.316776479418536\n ],\n [\n -92.78303275449902,\n 45.11481575379119\n ],\n [\n -92.74006801870277,\n 45.11481575379119\n ],\n [\n -92.72271624093813,\n 45.12507537508348\n ],\n [\n -92.68037840773216,\n 45.28795875844952\n ],\n [\n -92.62547203487303,\n 45.45770852010466\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"18","issue":"6","noUsgsAuthors":false,"publicationDate":"2025-09-15","publicationStatus":"PW","contributors":{"authors":[{"text":"Hanson, Jenny L. 0000-0001-8353-6908 jhanson@usgs.gov","orcid":"https://orcid.org/0000-0001-8353-6908","contributorId":461,"corporation":false,"usgs":true,"family":"Hanson","given":"Jenny","email":"jhanson@usgs.gov","middleInitial":"L.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":950742,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stone, Jayme 0000-0002-0512-3072","orcid":"https://orcid.org/0000-0002-0512-3072","contributorId":251712,"corporation":false,"usgs":false,"family":"Stone","given":"Jayme","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":false,"id":950743,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kitchel, Lisie","contributorId":362829,"corporation":false,"usgs":false,"family":"Kitchel","given":"Lisie","affiliations":[{"id":82352,"text":"Wisconsin Department of Natural Resources (WI DNR)","active":true,"usgs":false}],"preferred":false,"id":950744,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Weinzinger, Jesse","contributorId":339829,"corporation":false,"usgs":false,"family":"Weinzinger","given":"Jesse","affiliations":[{"id":38155,"text":"WI DNR","active":true,"usgs":false}],"preferred":false,"id":950745,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Newton, Teresa J. 0000-0001-9351-5852","orcid":"https://orcid.org/0000-0001-9351-5852","contributorId":361878,"corporation":false,"usgs":false,"family":"Newton","given":"Teresa","middleInitial":"J.","affiliations":[{"id":85472,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":false}],"preferred":false,"id":950746,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70272748,"text":"70272748 - 2025 - The influence of nodule versus crust morphology on the composition of seamount-hosted ferromanganese minerals","interactions":[],"lastModifiedDate":"2025-12-08T17:10:43.692547","indexId":"70272748","displayToPublicDate":"2025-09-15T11:09:45","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"The influence of nodule versus crust morphology on the composition of seamount-hosted ferromanganese minerals","docAbstract":"Ferromanganese mineral precipitation in the global oceans is ubiquitous, occurring in the form of both crusts and nodules at a broad range of depths and seafloor terrains. Although ferromanganese crusts and nodules are both composed of ferromanganese minerals, mineralogy and mean element concentrations compiled for regional crust versus nodule occurrences differ. Notably, most published compilations compare nodules from abyssal plain sediments to crusts forming on seamounts, and do not address the question as to whether mineral morphology may affect the composition of crusts and nodules in addition to environmental factors. To address this, we have compiled a dataset of co-located hydrogenetic (seawater sourced) open-ocean ferromanganese crusts and seamount-hosted nodules. The preliminary data presented here support our hypothesis that co-located crusts and nodules exhibit similar compositions, both in terms of their mineralogy and mean element concentrations, as well as overall variance in concentrations for any given element. These data indicate that local processes influence sample-to-sample variation in both crusts and nodules, in contrast to broader ferromanganese variation reported between open-ocean seamounts- hosted crusts and abyssal plain-hosted nodules.","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Mizell, K., Piper, E., Blackburn, T., and Gartman, A., 2025, The influence of nodule versus crust morphology on the composition of seamount-hosted ferromanganese minerals, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1051-1054.","productDescription":"4 p.","startPage":"1051","endPage":"1054","ipdsId":"IP-176874","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":497238,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":497166,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Mizell, Kira 0000-0002-5066-787X kmizell@usgs.gov","orcid":"https://orcid.org/0000-0002-5066-787X","contributorId":4914,"corporation":false,"usgs":true,"family":"Mizell","given":"Kira","email":"kmizell@usgs.gov","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":951594,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Piper, Emily","contributorId":363392,"corporation":false,"usgs":false,"family":"Piper","given":"Emily","affiliations":[{"id":6948,"text":"UC Santa Cruz","active":true,"usgs":false}],"preferred":false,"id":951595,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Blackburn, Terrence 0000-0003-0029-0709","orcid":"https://orcid.org/0000-0003-0029-0709","contributorId":259241,"corporation":false,"usgs":false,"family":"Blackburn","given":"Terrence","email":"","affiliations":[{"id":6949,"text":"University of California, Santa Cruz","active":true,"usgs":false}],"preferred":false,"id":951596,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gartman, Amy 0000-0001-9307-3062 agartman@usgs.gov","orcid":"https://orcid.org/0000-0001-9307-3062","contributorId":215546,"corporation":false,"usgs":true,"family":"Gartman","given":"Amy","email":"agartman@usgs.gov","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":951597,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70272744,"text":"70272744 - 2025 - Fluid evolution and timing of the Stibnite-Yellow Pine district, Idaho","interactions":[],"lastModifiedDate":"2025-12-09T14:14:38.760473","indexId":"70272744","displayToPublicDate":"2025-09-15T11:04:02","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Fluid evolution and timing of the Stibnite-Yellow Pine district, Idaho","docAbstract":"Gold, antimony, and tungsten resources of the Stibnite-Yellow Pine district, Idaho, are hosted in complexly faulted Late Cretaceous Atlanta Lobe of the Idaho batholith and surrounding Neoproterozoic-Paleozoic metamorphic rocks. This study utilizes detailed petrography and trace element chemistry of quartz to establish relative timing relationships between successive ore forming events and provide textural constraints for the interpretation of geochronologic data. Textures are discussed in the context of fluid inclusion populations that provide evidence into the P-T-X evolution of the hydrothermal system. Results reveal that the deposits contain multiple overprinting generations of hydrothermal quartz, each with distinct cathodoluminescence (CL) signature, trace element chemistry, and fluid inclusion populations. Quartz textures record a complex history of recrystallization, dissolution, and successive overgrowth as fluids evolved towards lower temperatures and CO2 contents. Quartz associated with the main stage of Au deposition contains relatively high concentrations of Ti, with low concentrations of all other elements measured. Later quartz generations are depleted in Ti, but show elevated Al concentrations, with significant concentrations of Sb measured in quartz associated with stibnite. Textural and geochemical evidence suggests that the system evolved from deeper mesozonal Au-W deposition towards more shallow epizonal Sb-(Ag) deposition during a period of rapid uplift.","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Bennett, M.M., Marsh, E.E., and Lowers, H.A., 2025, Fluid evolution and timing of the Stibnite-Yellow Pine district, Idaho, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 987-990.","productDescription":"4 p.","startPage":"987","endPage":"990","ipdsId":"IP-176482","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":497209,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":497272,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"country":"United States","state":"Idaho","otherGeospatial":"Stibnite-Yellow Pine district","volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Bennett, Mitchell M. 0000-0001-9533-9557 mbennett@usgs.gov","orcid":"https://orcid.org/0000-0001-9533-9557","contributorId":199379,"corporation":false,"usgs":true,"family":"Bennett","given":"Mitchell","email":"mbennett@usgs.gov","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":951591,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Marsh, Erin E. 0000-0001-5245-9532 emarsh@usgs.gov","orcid":"https://orcid.org/0000-0001-5245-9532","contributorId":1250,"corporation":false,"usgs":true,"family":"Marsh","given":"Erin","email":"emarsh@usgs.gov","middleInitial":"E.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":951592,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lowers, Heather A. 0000-0001-5360-9264 hlowers@usgs.gov","orcid":"https://orcid.org/0000-0001-5360-9264","contributorId":191307,"corporation":false,"usgs":true,"family":"Lowers","given":"Heather","email":"hlowers@usgs.gov","middleInitial":"A.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":951593,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70265755,"text":"70265755 - 2025 - Utilizing downhole datasets for modelling the aeromagnetic signature of the Iron Creek Co-Cu deposit in the Idaho Cobalt Belt","interactions":[],"lastModifiedDate":"2026-02-04T17:10:06.353748","indexId":"70265755","displayToPublicDate":"2025-09-15T11:01:06","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Utilizing downhole datasets for modelling the aeromagnetic signature of the Iron Creek Co-Cu deposit in the Idaho Cobalt Belt","docAbstract":"The Idaho Cobalt Belt in east-central Idaho is host to some of the largest domestic Co resources, including the informal Iron Creek deposit. The two main ore zones of this deposit, the Iron Creek and the Ruby, are hosted in greenschist-grade interbedded argillite/siltstone and quartz-rich units of the Mesoproterozoic Apple Creek Formation of Lemhi Group. The primary ore mineral is cobalt-bearing pyrite, which occurs with pyrrhotite, chalcopyrite, and magnetite. This study integrates mineralogical and core-scale geophysical measurements with regional-scale aeromagnetic surveys. The high magnetite content within the Ruby zone produces elevated magnetic susceptibility, but the relatively limited spatial footprint of the ore zone would produce a small-scale anomaly that may be overlooked in regional surveys. The low magnetite content in the Iron Creek zone results in low magnetic susceptibility, creating a relatively low amplitude geophysical response. By characterizing the magnetic properties and mineralogy of these ore zones, this study enhances the interpretation of aeromagnetic data, enabling the identification of small or faint anomalies as potential Co targets. These findings improve can improve exploration strategies, both within the Idaho Cobalt Belt as well as for similar deposit types globally.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Schmidt, D., Phelps, G., Pfaff, K.I., and Monecke, T., 2025, Utilizing downhole datasets for modelling the aeromagnetic signature of the Iron Creek Co-Cu deposit in the Idaho Cobalt Belt, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 955-958.","productDescription":"4 p.","startPage":"955","endPage":"958","ipdsId":"IP-176598","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":484558,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://e-sga.org/home"},{"id":499516,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Idaho","volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Schmidt, Daniel","contributorId":353374,"corporation":false,"usgs":false,"family":"Schmidt","given":"Daniel","affiliations":[{"id":6606,"text":"Colorado School of Mines","active":true,"usgs":false}],"preferred":false,"id":933423,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Phelps, Geoffrey 0000-0003-1958-2736 gphelps@usgs.gov","orcid":"https://orcid.org/0000-0003-1958-2736","contributorId":127489,"corporation":false,"usgs":true,"family":"Phelps","given":"Geoffrey","email":"gphelps@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":933424,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Pfaff, Katharina I. 0000-0002-6605-2722","orcid":"https://orcid.org/0000-0002-6605-2722","contributorId":362430,"corporation":false,"usgs":true,"family":"Pfaff","given":"Katharina","middleInitial":"I.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":933425,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Monecke, Thomas","contributorId":50423,"corporation":false,"usgs":true,"family":"Monecke","given":"Thomas","affiliations":[],"preferred":false,"id":933426,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70267778,"text":"70267778 - 2025 - Fingerprinting magmatic REE deposit sources with zircon petrochronology","interactions":[],"lastModifiedDate":"2026-01-20T15:25:25.027285","indexId":"70267778","displayToPublicDate":"2025-09-15T10:57:23","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Fingerprinting magmatic REE deposit sources with zircon petrochronology","docAbstract":"Carbonatites and associated alkaline silicate rocks are of considerable economic interest due to their enrichments in rare earth elements. The petrogenesis and source(s) of these complexes, however, are poorly understood. Models propose either mantle plume-derived carbon-rich melts or a mantle source enriched by subduction-related metasomatism. We use zircon trace elements to fingerprint carbonatite-alkaline complex sources, focusing on the economically significant 1.4 Ga Mountain Pass intrusive suite (MPIS). Autocrystic zircon from MPIS alkaline silicate rocks are enriched in Th and U relative to Nb suggesting a subduction influenced, oxidized source region. Lower Sc/Yb, higher Ti concentrations, and the absence of Eu anomalies in autocrystic zircon suggest derivation from a less hydrous, hotter, and deeper mantle source relative to arc-related 1.8–1.6 Ga inherited zircon. These data are best explained by syn- to post-collisional Mesoproterozoic reactivation of a subduction-metasomatized mantle source. The source and tectonic setting of the MPIS contrasts with Mesoproterozoic Gifford Creek and Bayan Obo carbonatites which exhibit plume-like compositions and are associated with rifts, suggesting different sources and tectonic settings for these economically significant deposits. We demonstrate that zircon petrochronology is a robust method for distinguishing carbonatite sources and can inform more targeted exploration strategies for critical mineral resources.","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society of Geology Applied to Mineral Deposits","usgsCitation":"Hillenbrand, I.W., Benson, E.K., Watts, K., and Thompson, J.M., 2025, Fingerprinting magmatic REE deposit sources with zircon petrochronology, 18th SGA Biennial Meeting, v. 2, Golden, CO, August 3-7, 2025, p. 647-650.","productDescription":"4 p.","startPage":"647","endPage":"650","ipdsId":"IP-175464","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":498749,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"},{"id":498750,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"2","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Hillenbrand, Ian William 0000-0003-2801-3674","orcid":"https://orcid.org/0000-0003-2801-3674","contributorId":299032,"corporation":false,"usgs":true,"family":"Hillenbrand","given":"Ian","email":"","middleInitial":"William","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":938828,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Benson, Erin Kay 0000-0003-3166-6043","orcid":"https://orcid.org/0000-0003-3166-6043","contributorId":346098,"corporation":false,"usgs":true,"family":"Benson","given":"Erin","email":"","middleInitial":"Kay","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":938829,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Watts, Kathryn E. 0000-0002-6110-7499","orcid":"https://orcid.org/0000-0002-6110-7499","contributorId":204344,"corporation":false,"usgs":true,"family":"Watts","given":"Kathryn E.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":938830,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Thompson, Jay M. 0000-0003-3322-0870","orcid":"https://orcid.org/0000-0003-3322-0870","contributorId":329664,"corporation":false,"usgs":true,"family":"Thompson","given":"Jay","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":938831,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70265907,"text":"70265907 - 2025 - Geochemistry and thermometry of magnetite veins and replacements in iron ore deposits from the Iron Springs district, SW Utah, USA: Relation to magmatic and hydrothermal processes","interactions":[],"lastModifiedDate":"2026-02-04T17:00:26.790588","indexId":"70265907","displayToPublicDate":"2025-09-15T10:56:03","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Geochemistry and thermometry of magnetite veins and replacements in iron ore deposits from the Iron Springs district, SW Utah, USA: Relation to magmatic and hydrothermal processes","docAbstract":"Ore-genesis, texture, chemical compositions, and thermometry of magnetite were used to better evaluate the origins of iron ore deposits across the Iron Spring district, Utah. Trace element compositions, determined by LA-ICP-MS, were used to calculate temperatures based on XMg numbers and characterize the trace element signatures of magmatic and hydrothermal magnetite. Magnetite occurs as coarser crystalline grains within veins, breccias, and cavities along with finer crystalline replacements. Magnetite is most commonly intergrown with apatite, phlogopite, and carbonate in veins, breccias, and cavities where apatite occurs separately from the other gangue minerals. The results using empirical trace element discrimination diagrams generally suggest that the magnetite is overall of hydrothermal origin regardless of textural variations or field relationships. The XMg numbers of the magnetite in the magnetite-apatite ores, however, are suggestive of high temperature magmatic conditions; whereas those of vein, breccia, and replacement occurrences containing other gangue minerals are suggestive of lower temperature hydrothermal processes.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits (SGA)","usgsCitation":"Meighan, C.J., Taylor, R.D., Hofstra, A.H., and Thompson, J.M., 2025, Geochemistry and thermometry of magnetite veins and replacements in iron ore deposits from the Iron Springs district, SW Utah, USA: Relation to magmatic and hydrothermal processes, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1043-1046.","productDescription":"4 p.","startPage":"1043","endPage":"1046","ipdsId":"IP-176507","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":499515,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":499514,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"country":"United States","state":"Utah","otherGeospatial":"Iron Springs district","volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Meighan, Corey J. 0000-0002-5668-1621 cmeighan@usgs.gov","orcid":"https://orcid.org/0000-0002-5668-1621","contributorId":5892,"corporation":false,"usgs":true,"family":"Meighan","given":"Corey","email":"cmeighan@usgs.gov","middleInitial":"J.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":933884,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Taylor, Ryan D. 0000-0002-8845-5290 rtaylor@usgs.gov","orcid":"https://orcid.org/0000-0002-8845-5290","contributorId":3412,"corporation":false,"usgs":true,"family":"Taylor","given":"Ryan","email":"rtaylor@usgs.gov","middleInitial":"D.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":933885,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hofstra, Albert H. 0000-0002-2450-1593 ahofstra@usgs.gov","orcid":"https://orcid.org/0000-0002-2450-1593","contributorId":1302,"corporation":false,"usgs":true,"family":"Hofstra","given":"Albert","email":"ahofstra@usgs.gov","middleInitial":"H.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":933886,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Thompson, Jay M. 0000-0003-3322-0870","orcid":"https://orcid.org/0000-0003-3322-0870","contributorId":329664,"corporation":false,"usgs":true,"family":"Thompson","given":"Jay","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":933887,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70272741,"text":"70272741 - 2025 - Paleoproterozoic vein graphite mineralization caused by decarbonation in the Ruby Range, Montana, USA","interactions":[],"lastModifiedDate":"2025-12-08T17:01:10.120498","indexId":"70272741","displayToPublicDate":"2025-09-15T10:55:32","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Paleoproterozoic vein graphite mineralization caused by decarbonation in the Ruby Range, Montana, USA","docAbstract":"Hydrothermal graphite veins are a possible source for modern battery materials and require better understanding of their carbon source(s) and absolute timing to develop mapable criteria for exploration models. We present new observations of graphite vein and alteration paragenesis and U-Pb LA-ICP-MS titanite age data from the Ruby prospect, Montana, USA, that constrain mineralization timing and source. The graphite veins cut high-temperature metamorphic rocks of the lower Christensen Range suite and are associated with intense diopside (Di0.69Hd0.27Jo0.04) alteration of marble. The oldest titanite ages in fresh marble and partially altered calc-silicate gneiss are ca. 2,500 – 2,450 Ma, show elevated REE values, and Eu/Eu* <1.5, consistent with growth during early regional metamorphism. Titanite in diopside-graphite alteration, interpreted as part of the hydrothermal vein-forming episode, cluster around 1,750 Ma, are characterized by lower REE values, and show Eu/Eu* >2; suggesting a low fO2 fluid generated from metamorphism during the Big Sky orogeny. Our paragenetic observations and titanite ages indicate graphite vein formation via skarnoid decarbonation reactions in marble late in regional orogenesis. Granulite-facies, carbonate-bearing, supracrustal rock terranes are thus favorable for hydrothermal graphite vein deposits.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Case, G.N., Thompson, J.M., and Regan, S.P., 2025, Paleoproterozoic vein graphite mineralization caused by decarbonation in the Ruby Range, Montana, USA, 18th SGA Biennial Meeting, v. 1, Golden, CO, August 3-7, 2025, p. 197-200.","productDescription":"4 p.","startPage":"197","endPage":"200","ipdsId":"IP-175952","costCenters":[{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true},{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":497205,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"},{"id":497206,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United STates","state":"Montana","otherGeospatial":"Ruby Range","volume":"1","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Case, George N.D. 0000-0001-9826-5661 gcase@usgs.gov","orcid":"https://orcid.org/0000-0001-9826-5661","contributorId":224941,"corporation":false,"usgs":true,"family":"Case","given":"George","email":"gcase@usgs.gov","middleInitial":"N.D.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":951588,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thompson, Jay M. 0000-0003-3322-0870","orcid":"https://orcid.org/0000-0003-3322-0870","contributorId":329664,"corporation":false,"usgs":true,"family":"Thompson","given":"Jay","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":951589,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Regan, Sean P. 0000-0002-8445-5138","orcid":"https://orcid.org/0000-0002-8445-5138","contributorId":360816,"corporation":false,"usgs":false,"family":"Regan","given":"Sean","middleInitial":"P.","affiliations":[{"id":7211,"text":"University of Alaska, Fairbanks","active":true,"usgs":false}],"preferred":false,"id":951590,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70265964,"text":"70265964 - 2025 - Re-Os geochronology of molybdenite by LA-ICP-MS/MS","interactions":[],"lastModifiedDate":"2026-02-04T16:55:11.024495","indexId":"70265964","displayToPublicDate":"2025-09-15T10:51:36","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Re-Os geochronology of molybdenite by LA-ICP-MS/MS","docAbstract":"Re-Os geochronology is a powerful tool to directly date sulphide mineralisation using phases such as molybdenite, pyrite and chalcopyrite. We present a snapshot of a method in development utilizing laser ablation inductively coupled-plasma ‘triple quad’ mass spectrometry (LA-ICP-MS/MS) for Re-Os geochronology of molybdenite. While traditional LA-(MC)-ICP-MS measurements are limited by the >90% isobaric interference correction of parent radioactive 187Re on radiogenic daughter 187Os, the MS/MS technology minimizes this correction through careful instrument tuning and use of a (CH4 + H2 + He) reaction gas mixture to mass shift 187Os away from 187Re. We demonstrate the potential of the MS/MS technique by presenting robust Re-Os dates for three different molybdenite samples ranging in age from ~28 to 1520 Ma.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits (SGA)","usgsCitation":"Souders, A., and Thompson, J.M., 2025, Re-Os geochronology of molybdenite by LA-ICP-MS/MS, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1169-1172.","productDescription":"4 p.","startPage":"1169","endPage":"1172","ipdsId":"IP-176706","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":499512,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":499510,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Souders, Amanda 0000-0002-1367-8924","orcid":"https://orcid.org/0000-0002-1367-8924","contributorId":296423,"corporation":false,"usgs":true,"family":"Souders","given":"Amanda","email":"","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":934174,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thompson, Jay M. 0000-0003-3322-0870","orcid":"https://orcid.org/0000-0003-3322-0870","contributorId":329664,"corporation":false,"usgs":true,"family":"Thompson","given":"Jay","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":934175,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70266124,"text":"70266124 - 2025 - Assessing United States gallium and germanium resources in basin-hosted deposits – The good and bad","interactions":[],"lastModifiedDate":"2026-02-05T14:34:55.032351","indexId":"70266124","displayToPublicDate":"2025-09-15T10:45:43","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Assessing United States gallium and germanium resources in basin-hosted deposits – The good and bad","docAbstract":"Basin-hosted Zn-Pb deposits, including MVT and clastic-dominated (CD or “Sedex”) Zn-Pb deposits are major sources of Zn and Pb, as well as other critical elements. We examined available whole rock and sphalerite chemistry data to understand the apparent variation of Ga and Ge among major current and historical districts of the United States (US). Robust data from the Central Tennessee district demonstrate Ga and Ge enrichment. Limited historical data suggesting anomalous concentrations in the nearby Central Kentucky and Illinois-Kentucky districts imply a possible similar fluid chemistry for Ga and Ge transport. The deposits of the Red Dog district, Alaska, also have anomalous concentrations of Ge, but not Ga. Our work demonstrates the utility of whole rock geochemistry to identify potential critical element resources. Highly qualitative estimates, based on geochemical data, indicate that these basin-hosted deposits contain Ge (and in the case of Central Tennessee, Ge and Ga) resources of potentially sufficient size to provide decades of resources if appropriate domestic processing is developed.","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Ore Deposits","usgsCitation":"Graham, G.E., and Tharalson, E., 2025, Assessing United States gallium and germanium resources in basin-hosted deposits – The good and bad, 18th SGA Biennial Meeting, v. 1, Golden, CO, August 3-7, 2025, p. 134-137.","productDescription":"4 p.","startPage":"134","endPage":"137","ipdsId":"IP-176763","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":499508,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"},{"id":499509,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","volume":"1","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Graham, Garth E. 0000-0003-0657-0365 ggraham@usgs.gov","orcid":"https://orcid.org/0000-0003-0657-0365","contributorId":1031,"corporation":false,"usgs":true,"family":"Graham","given":"Garth","email":"ggraham@usgs.gov","middleInitial":"E.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true},{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":934664,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tharalson, Erik Roger 0000-0002-3892-4458","orcid":"https://orcid.org/0000-0002-3892-4458","contributorId":353883,"corporation":false,"usgs":true,"family":"Tharalson","given":"Erik Roger","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":934665,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70272703,"text":"70272703 - 2025 - 40Ar/39Ar geochronology supporting mineral resources research at USGS Denver","interactions":[],"lastModifiedDate":"2025-12-05T16:45:20.687997","indexId":"70272703","displayToPublicDate":"2025-09-15T10:40:28","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"displayTitle":"40Ar/39Ar geochronology supporting mineral resources research at USGS Denver","title":"40Ar/39Ar geochronology supporting mineral resources research at USGS Denver","docAbstract":"The 40Ar/39Ar geochronology method is used to date potassium-bearing rocks and minerals, based on the decay of 40K to 40Ar, which provides important temporal constraints for geological events. The USGS Denver Argon Geochronology Laboratory dates samples from a variety of projects, mainly in the USGS Mineral Resource Program and the National Cooperative Geologic Mapping Program, facilitating in-depth research into the timing of geological events and processes. Recent applications of this method include geochronological studies in the Yellow Pine district, revealing mineralization ages that range from 51 to 70 Ma, and investigations into the Bear Lodge alkaline complex, providing insights into the timing of REE carbonatite formation. Additionally, studies at Alunite Ridge highlight the method's potential for understanding concealed mineral deposits. Ongoing projects continue to leverage 40Ar/39Ar data to enhance understanding of geologic frameworks and mineral resources, underpinning its importance in modern geochronology and mineral resource assessment.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Morgan, L.E., and Mercer, C.M., 2025, 40Ar/39Ar geochronology supporting mineral resources research at USGS Denver, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1150-1152.","productDescription":"3 p.","startPage":"1150","endPage":"1152","ipdsId":"IP-175512","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":497151,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"},{"id":497150,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Morgan, Leah E. 0000-0001-9930-524X lemorgan@usgs.gov","orcid":"https://orcid.org/0000-0001-9930-524X","contributorId":176174,"corporation":false,"usgs":true,"family":"Morgan","given":"Leah","email":"lemorgan@usgs.gov","middleInitial":"E.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":951375,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mercer, Cameron Mark 0000-0003-0534-848X","orcid":"https://orcid.org/0000-0003-0534-848X","contributorId":301880,"corporation":false,"usgs":true,"family":"Mercer","given":"Cameron","email":"","middleInitial":"Mark","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":951376,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70266156,"text":"70266156 - 2025 - Seamless Geologic Map Database for the Intermountain West, United States: A foundational dataset for mineral systems analysis","interactions":[],"lastModifiedDate":"2026-02-04T16:44:01.554627","indexId":"70266156","displayToPublicDate":"2025-09-15T10:39:09","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Seamless Geologic Map Database for the Intermountain West, United States: A foundational dataset for mineral systems analysis","docAbstract":"The Intermountain West has a complex geologic history, resulting in the formation of a diverse array of mineral deposits. Effective mineral exploration requires understanding the spatial and temporal relationships among geologic processes and events, a key focus of the mineral systems approach to exploration. This paper presents the Intermountain West Seamless Geologic Map Database, a unified dataset designed to support mineral exploration. Integrating geologic provinces, structural settings, and hydrothermal alteration, the database leverages the Seamless Integrated Geologic Mapping (SIGMa) extension to the USGS Geologic Map Schema (GeMS) to standardize geologic data from varied sources. SIGMa's hierarchical stratigraphic organization and feature-level metadata enhance data interoperability and reusability, enabling seamless query, analysis, and visualization of lithology, structural features, mineral deposits, geochronology, hydrothermal alteration. volcanic activity, and By providing a regionally consistent and dynamically evolving geologic map, this database provides a foundational framework for mineral exploration and geologic research. It also allows for an efficient workflow that expedites the publication of integrated geologic map databases.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society of Geology Applied to Mineral Deposits (SGA)","usgsCitation":"Gilmer, A.K., Turner, K.J., Workman, J.B., Thompson, R.A., Schwartz, T.M., and Ruleman, C.A., 2025, Seamless Geologic Map Database for the Intermountain West, United States: A foundational dataset for mineral systems analysis, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1110-1113.","productDescription":"4 p.","startPage":"1110","endPage":"1113","ipdsId":"IP-176090","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":499507,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":499506,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Gilmer, Amy K. 0000-0001-5038-8136","orcid":"https://orcid.org/0000-0001-5038-8136","contributorId":218307,"corporation":false,"usgs":true,"family":"Gilmer","given":"Amy","email":"","middleInitial":"K.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":934759,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Turner, Kenzie J. 0000-0002-4940-3981 kturner@usgs.gov","orcid":"https://orcid.org/0000-0002-4940-3981","contributorId":496,"corporation":false,"usgs":true,"family":"Turner","given":"Kenzie","email":"kturner@usgs.gov","middleInitial":"J.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":934760,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Workman, Jeremiah B. 0000-0001-7816-6420 jworkman@usgs.gov","orcid":"https://orcid.org/0000-0001-7816-6420","contributorId":714,"corporation":false,"usgs":true,"family":"Workman","given":"Jeremiah","email":"jworkman@usgs.gov","middleInitial":"B.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":934761,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Thompson, Ren A. 0000-0002-3044-3043 rathomps@usgs.gov","orcid":"https://orcid.org/0000-0002-3044-3043","contributorId":1265,"corporation":false,"usgs":true,"family":"Thompson","given":"Ren","email":"rathomps@usgs.gov","middleInitial":"A.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":934762,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Schwartz, Theresa Maude 0000-0001-6606-4072","orcid":"https://orcid.org/0000-0001-6606-4072","contributorId":245180,"corporation":false,"usgs":true,"family":"Schwartz","given":"Theresa","email":"","middleInitial":"Maude","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":934763,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Ruleman, Chester A. 0000-0002-1503-4591 cruleman@usgs.gov","orcid":"https://orcid.org/0000-0002-1503-4591","contributorId":1264,"corporation":false,"usgs":true,"family":"Ruleman","given":"Chester","email":"cruleman@usgs.gov","middleInitial":"A.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":934764,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70266182,"text":"70266182 - 2025 - Ages and trace element fertility of porphyry-related mineralization in the Philipsburg polymetallic district, Montana, with a comparison to Butte","interactions":[],"lastModifiedDate":"2026-02-04T16:37:48.754779","indexId":"70266182","displayToPublicDate":"2025-09-15T10:27:11","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Ages and trace element fertility of porphyry-related mineralization in the Philipsburg polymetallic district, Montana, with a comparison to Butte","docAbstract":"The Philipsburg mining district is a Mo-Cu porphyry system with associated Cordilleran polymetallic veins. Geochronology was employed to date the porphyry (~66 Ma, U/Pb in zircon) and molybdenite mineralization from the veins (~76 Ma, Re-Os). Age results suggest that the two-mineralization events model proposed by Lund et al. (2018) for the Butte district can be applied to the Philipsburg deposit. Furthermore, common fertility indicators from zircon trace elements were analyzed with variable success to characterize the existing Mo-Cu mineralization of the Philipsburg porphyry. This raises concerns about the benefits of this method and/or the importance of sampling, which could impact exploration for similar porphyry deposits.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits (SGA)","usgsCitation":"Beaucamp, C.M., Gammons, C.H., Thompson, J.M., and Stein, H.J., 2025, Ages and trace element fertility of porphyry-related mineralization in the Philipsburg polymetallic district, Montana, with a comparison to Butte, 18th SGA Biennial Meeting, v. 2, Golden, CO, August 3-7, 2025, p. 356-359.","productDescription":"4 p.","startPage":"356","endPage":"359","ipdsId":"IP-173924","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":499505,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":499504,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"country":"United States","state":"Montana","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -111,\n 47\n ],\n [\n -114.5,\n 47\n ],\n [\n -114.5,\n 45.25\n ],\n [\n -111,\n 45.25\n ],\n [\n -111,\n 47\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"2","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Beaucamp, Celine M.E.","contributorId":353952,"corporation":false,"usgs":false,"family":"Beaucamp","given":"Celine","middleInitial":"M.E.","affiliations":[{"id":84532,"text":"Montana Technological University, Butte, MT, USA","active":true,"usgs":false}],"preferred":false,"id":934813,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gammons, Chris","contributorId":140801,"corporation":false,"usgs":false,"family":"Gammons","given":"Chris","affiliations":[{"id":13574,"text":"Montana Tech of the University of Montana, Butte, MT","active":true,"usgs":false}],"preferred":false,"id":934814,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thompson, Jay M. 0000-0003-3322-0870","orcid":"https://orcid.org/0000-0003-3322-0870","contributorId":329664,"corporation":false,"usgs":true,"family":"Thompson","given":"Jay","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":934815,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stein, Holly J. 0000-0002-9709-7165","orcid":"https://orcid.org/0000-0002-9709-7165","contributorId":210107,"corporation":false,"usgs":false,"family":"Stein","given":"Holly","email":"","middleInitial":"J.","affiliations":[{"id":6621,"text":"Colorado State University","active":true,"usgs":false}],"preferred":true,"id":934816,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70273118,"text":"70273118 - 2025 - Pre- and post-eruptive geochemical and isotopic fingerprints of rhyolites parental to volcano-sedimentary lithium brine and clay resources in the western USA & central Andes","interactions":[],"lastModifiedDate":"2025-12-16T16:37:07.010825","indexId":"70273118","displayToPublicDate":"2025-09-15T10:21:38","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Pre- and post-eruptive geochemical and isotopic fingerprints of rhyolites parental to volcano-sedimentary lithium brine and clay resources in the western USA & central Andes","docAbstract":"Lithium is a high-demand, critical element used not only in lightweight rechargeable lithium-ion batteries, but also in nuclear applications and industries producing ceramics, aluminum, and medical products. It is extracted primarily from pegmatites and volcano-sedimentary brines and clays in arid, closed lacustrine or caldera basins. Lithium brines of the central Andean salars in the AltiplanoPuna Plateau contain around ~70% of the world’s lithium resources. In contrast, Clayton Valley, Nevada is the only current producer of lithium brines in the United States and accounts for ~6% of current global lithium production. Clayton Valley hosts a newly defined Li-clay resource where locally exposed rhyolite tuffs have been proposed as a lithium source. Identifying magma evolution processes and determining the importance of syn- and post-eruptive processes on the source, mobility, and distribution of lithium is an ongoing area of research. These two regions illustrate distinctive magmatic-tectonic regimes for volcano-sedimentary lithium enrichment and therefore represent ideal regions to explore the key geological processes critical to the enrichment of lithium resources.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Mercer, C.N., Khoury, R., Roberge, J., and Myers, M., 2025, Pre- and post-eruptive geochemical and isotopic fingerprints of rhyolites parental to volcano-sedimentary lithium brine and clay resources in the western USA & central Andes, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 920-923.","productDescription":"4 p.","startPage":"920","endPage":"923","ipdsId":"IP-176570","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":497577,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":497550,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings"}],"country":"Argentina, United States","otherGeospatial":"Clayton Valley, Puna Plateau","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -68.75,\n -20.4\n ],\n [\n -68.75,\n -26.343616243239154\n ],\n [\n -65.5,\n -26.343616243239154\n ],\n [\n -65.55,\n -20.4\n ],\n [\n -68.75,\n -20.4\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -118.30571551681487,\n 38.694527191606056\n ],\n [\n -118.30571551681487,\n 37.05639235345086\n ],\n [\n -116.15868820221229,\n 37.05639235345086\n ],\n [\n -116.15868820221229,\n 38.694527191606056\n ],\n [\n -118.30571551681487,\n 38.694527191606056\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Mercer, Celestine N. 0000-0001-8359-4147 cmercer@usgs.gov","orcid":"https://orcid.org/0000-0001-8359-4147","contributorId":4006,"corporation":false,"usgs":true,"family":"Mercer","given":"Celestine","email":"cmercer@usgs.gov","middleInitial":"N.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":952381,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Khoury, Regina Marie 0000-0003-2421-986X","orcid":"https://orcid.org/0000-0003-2421-986X","contributorId":294769,"corporation":false,"usgs":true,"family":"Khoury","given":"Regina Marie","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":952382,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Roberge, Julie","contributorId":152268,"corporation":false,"usgs":false,"family":"Roberge","given":"Julie","email":"","affiliations":[{"id":18893,"text":"Instituto Politecnico Nacional, ESIA-Ticoman","active":true,"usgs":false}],"preferred":false,"id":952383,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Myers, Madison 0000-0003-2271-4445","orcid":"https://orcid.org/0000-0003-2271-4445","contributorId":331812,"corporation":false,"usgs":false,"family":"Myers","given":"Madison","email":"","affiliations":[{"id":36555,"text":"Montana State University","active":true,"usgs":false}],"preferred":false,"id":952384,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70271485,"text":"70271485 - 2025 - Water temperature regimes and thermal drivers in semi-natural and flow-regulated rivers of the northern Great Plains","interactions":[],"lastModifiedDate":"2025-12-15T16:35:21.447687","indexId":"70271485","displayToPublicDate":"2025-09-15T09:39:41","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3301,"text":"River Research and Applications","active":true,"publicationSubtype":{"id":10}},"title":"Water temperature regimes and thermal drivers in semi-natural and flow-regulated rivers of the northern Great Plains","docAbstract":"Rivers of the northern Great Plains have lacked long-term, continuous water temperature assessments, and there is limited information on thermal regimes of these systems and factors driving water temperature. We collected and assembled 2001–2022 water temperature data from 18 sites on four reaches of three rivers that differ in anthropogenic impacts: semi-natural Yellowstone River (YR), flow-impacted Milk River (MK), 351-km of the Missouri River affected by hypolimnetic releases from Fort Peck Dam (FPD), and the semi-natural Missouri River (MR3093) upstream from FPD. Objectives were to: (1) compare May–September mean daily water temperature (Tw), day of year of maximum water temperature (Tmaxdoy), and maximum water temperature (Twmax) among reaches, (2) evaluate air temperature (Ta), river discharge (Qw), and dam-release water temperature (Twdam) as Tw drivers, and (3) model longitudinal recovery of Tw downstream from FPD. Mean Tw and Twmax were greatest at the YR, MR3093 and MK sites, and significantly less through 291-km downstream from FPD. Tmaxdoy at initial sites downstream from FPD was delayed 43–69 days relative to the semi-natural reach upstream from FPD. Ta was the primary correlate of Tw for the semi-natural sites; whereas, Twdam and Ta varied inversely as primary drivers for sites downstream from FPD. Thermal recovery from hypolimnetic releases was incomplete 291-km downstream from FPD and warming persisted 351-km downstream. Results quantify the varied water temperature regimes of rivers in the northern Great Plains and improve understanding of controls affecting Tw among reaches. Water temperature attributes of semi-natural reaches could be used as restoration targets for 300-km of Missouri River presently impacted by hypolimnetic releases.
","language":"English","publisher":"Wiley","doi":"10.1002/rra.70040","usgsCitation":"Braaten, P., Ritter, T.D., Haddix, T.M., Fuller, D.B., Hunziker, J.R., and Hargrave, J.G., 2025, Water temperature regimes and thermal drivers in semi-natural and flow-regulated rivers of the northern Great Plains: River Research and Applications, v. 41, no. 10, p. 2073-2091, https://doi.org/10.1002/rra.70040.","productDescription":"19 p.","startPage":"2073","endPage":"2091","ipdsId":"IP-173819","costCenters":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"links":[{"id":495744,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/rra.70040","text":"Publisher Index Page"},{"id":495708,"rank":2,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Montana, North Dakota","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -109.74009289929737,\n 48.87888526247494\n ],\n [\n -109.74009289929737,\n 46.45771203249336\n ],\n [\n -103.34512548963949,\n 46.45771203249336\n ],\n [\n -103.34512548963949,\n 48.87888526247494\n ],\n [\n -109.74009289929737,\n 48.87888526247494\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"41","issue":"10","noUsgsAuthors":false,"publicationDate":"2025-09-15","publicationStatus":"PW","contributors":{"authors":[{"text":"Braaten, Patrick 0000-0003-3362-420X pbraaten@usgs.gov","orcid":"https://orcid.org/0000-0003-3362-420X","contributorId":152682,"corporation":false,"usgs":true,"family":"Braaten","given":"Patrick","email":"pbraaten@usgs.gov","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":948921,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ritter, T. David","contributorId":361493,"corporation":false,"usgs":false,"family":"Ritter","given":"T.","middleInitial":"David","affiliations":[{"id":78382,"text":"formerly Columbia Environmental Research Center","active":true,"usgs":false}],"preferred":false,"id":948922,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Haddix, Tyler M.","contributorId":361495,"corporation":false,"usgs":false,"family":"Haddix","given":"Tyler","middleInitial":"M.","affiliations":[{"id":37431,"text":"Montana Fish, Wildlife and Parks","active":true,"usgs":false}],"preferred":false,"id":948923,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Fuller, David B.","contributorId":361497,"corporation":false,"usgs":false,"family":"Fuller","given":"David","middleInitial":"B.","affiliations":[{"id":37431,"text":"Montana Fish, Wildlife and Parks","active":true,"usgs":false}],"preferred":false,"id":948924,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hunziker, John R.","contributorId":361499,"corporation":false,"usgs":false,"family":"Hunziker","given":"John","middleInitial":"R.","affiliations":[{"id":37431,"text":"Montana Fish, Wildlife and Parks","active":true,"usgs":false}],"preferred":false,"id":948925,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hargrave, John G.","contributorId":361501,"corporation":false,"usgs":false,"family":"Hargrave","given":"John","middleInitial":"G.","affiliations":[{"id":13502,"text":"US Army Corps of Engineers","active":true,"usgs":false}],"preferred":false,"id":948926,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70273382,"text":"70273382 - 2025 - Stable isotope composition and geochemistry of calcite and dolomite in the Mountain Pass carbonatite: A lens into petrogenesis","interactions":[],"lastModifiedDate":"2026-01-09T15:33:40.211421","indexId":"70273382","displayToPublicDate":"2025-09-15T09:27:45","publicationYear":"2025","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Stable isotope composition and geochemistry of calcite and dolomite in the Mountain Pass carbonatite: A lens into petrogenesis","docAbstract":"Carbonatites host most of the global rare earth element (REE) deposits. The petrogenesis of these rocks, including magmatic and post-magmatic processes, are poorly understood but critical in forming and upgrading these deposits. The Mountain Pass carbonatite, which hosts the only active REE mine in North America, is lithologically variable but consistently contains >50% calcite and/or dolomite. Multiple generations of carbonates are evident, suggesting bulk analysis of carbonate minerals would generate a mixed isotopic and geochemical signature. In-situ stable carbon and oxygen isotopes, combined with geochemical analysis and petrography, distinguish carbonate generations, trace the source region of the carbonatite magma, and link carbonate genesis to REE mineralization throughout the intrusion. Primary carbon and oxygen isotope values outside the accepted mantle range may suggest a subduction-related carbon and oxygen source in the mantle. Deformation textures in primary calcite indicate syn- or post-crystallization ductile flow. Carbonates with secondary textures and heavy δ13C and δ18O values are associated with ore mineralization, suggesting fluid mobilization was important in concentrating REE and upgrading of the Mountain Pass deposit.
","conferenceTitle":"18th SGA Biennial Meeting","conferenceDate":"August 3-7, 2025","conferenceLocation":"Golden, CO","language":"English","publisher":"Society for Geology Applied to Mineral Deposits","usgsCitation":"Benson, E.K., Watts, K., Thompson, J.M., and Lowers, H.A., 2025, Stable isotope composition and geochemistry of calcite and dolomite in the Mountain Pass carbonatite: A lens into petrogenesis, 18th SGA Biennial Meeting, v. 2, Golden, CO, August 3-7, 2025, p. 623-626.","productDescription":"4 p.","startPage":"623","endPage":"626","ipdsId":"IP-175628","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true},{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":498506,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":498485,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.e-sga.org/publications/conference-proceedings","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"California","otherGeospatial":"Mountain Pass Intrusive Suite","volume":"2","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Benson, Erin Kay 0000-0003-3166-6043","orcid":"https://orcid.org/0000-0003-3166-6043","contributorId":346098,"corporation":false,"usgs":true,"family":"Benson","given":"Erin","email":"","middleInitial":"Kay","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":953525,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Watts, Kathryn E. 0000-0002-6110-7499","orcid":"https://orcid.org/0000-0002-6110-7499","contributorId":204344,"corporation":false,"usgs":true,"family":"Watts","given":"Kathryn E.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":953526,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thompson, Jay M. 0000-0003-3322-0870","orcid":"https://orcid.org/0000-0003-3322-0870","contributorId":329664,"corporation":false,"usgs":true,"family":"Thompson","given":"Jay","middleInitial":"M.","affiliations":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":953527,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lowers, Heather A. 0000-0001-5360-9264 hlowers@usgs.gov","orcid":"https://orcid.org/0000-0001-5360-9264","contributorId":191307,"corporation":false,"usgs":true,"family":"Lowers","given":"Heather","email":"hlowers@usgs.gov","middleInitial":"A.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":953528,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70271446,"text":"70271446 - 2025 - Hyperspectral imaging of river bathymetry using an ensemble of regression trees","interactions":[],"lastModifiedDate":"2025-09-16T14:29:31.078808","indexId":"70271446","displayToPublicDate":"2025-09-15T09:20:35","publicationYear":"2025","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1425,"text":"Earth Surface Processes and Landforms","active":true,"publicationSubtype":{"id":10}},"title":"Hyperspectral imaging of river bathymetry using an ensemble of regression trees","docAbstract":"Remote sensing has emerged as an effective tool for characterizing river systems, and machine learning (ML) techniques could make this approach even more powerful. To explore this possibility, we developed an ML-based workflow for hyperspectral imaging of river bathymetry using an ensemble of regression trees (HIRBERT). This approach involves using paired observations of depth and reflectance to select wavelength bands as predictors and then train a depth retrieval model; applying the model to the image yields a spatially continuous bathymetric map. We used data from five rivers with diverse morphologies and optical characteristics to assess whether HIRBERT can (1) provide more accurate depth estimates than a band ratio-based algorithm and (2) extend the range of depths detectable via remote sensing. Relative to single band combinations identified via optimal band ratio analysis (OBRA), regression tree ensembles improved depth retrieval performance, with observed versus predicted (OP) regression R2 values increasing for all five sites. Similarly, HIRBERT provided more reliable depth estimates than OBRA over the full range of depths present along each river. These results suggest that by incorporating additional spectral information from multiple wavelength bands, ML could enhance bathymetric mapping across a range of river environments. In addition, we show how graphical tools can facilitate interpretation of ML-based depth retrieval models and yield insight regarding relationships between depth and reflectance. The HIRBERT workflow is packaged in free, standalone software developed to support applications in river research and management. Although ML can enhance remote sensing of river bathymetry, the limitations of this approach must also be acknowledged: Field measurements of water depth are required to train a depth retrieval model and the resulting model should only be applied to the image from which the training data were derived. The inherently image-specific nature of this approach implies that developing generalized regression tree ensembles that could be applied at larger scales would require additional research.
","language":"English","publisher":"Wiley","doi":"10.1002/esp.70155","usgsCitation":"Legleiter, C.J., Kinzel, P.J., Overstreet, B., and Harrison, L.R., 2025, Hyperspectral imaging of river bathymetry using an ensemble of regression trees: Earth Surface Processes and Landforms, v. 50, no. 12, e70155, 20 p., https://doi.org/10.1002/esp.70155.","productDescription":"e70155, 20 p.","ipdsId":"IP-176358","costCenters":[{"id":518,"text":"Oregon Water Science Center","active":true,"usgs":true},{"id":37786,"text":"WMA - Observing Systems Division","active":true,"usgs":true}],"links":[{"id":495594,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California, Idaho, Nebraska, Oregon, Wyoming","otherGeospatial":"Deschutes River, Kootenai River, Niobrara River, Sacramento River, Snake River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -126.50208043183841,\n 49\n ],\n [\n -126.50208043183841,\n 38.571428742902185\n ],\n [\n -99.8528658799654,\n 38.571428742902185\n ],\n [\n -99.8528658799654,\n 49\n ],\n [\n -126.50208043183841,\n 49\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"50","issue":"12","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Legleiter, Carl J. 0000-0003-0940-8013 cjl@usgs.gov","orcid":"https://orcid.org/0000-0003-0940-8013","contributorId":169002,"corporation":false,"usgs":true,"family":"Legleiter","given":"Carl","email":"cjl@usgs.gov","middleInitial":"J.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37778,"text":"WMA - Integrated Modeling and Prediction Division","active":true,"usgs":true}],"preferred":true,"id":948790,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kinzel, Paul J. 0000-0002-6076-9730 pjkinzel@usgs.gov","orcid":"https://orcid.org/0000-0002-6076-9730","contributorId":743,"corporation":false,"usgs":true,"family":"Kinzel","given":"Paul","email":"pjkinzel@usgs.gov","middleInitial":"J.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37778,"text":"WMA - Integrated Modeling and Prediction Division","active":true,"usgs":true},{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":948791,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Overstreet, Brandon 0000-0001-7845-6671 boverstreet@usgs.gov","orcid":"https://orcid.org/0000-0001-7845-6671","contributorId":169201,"corporation":false,"usgs":true,"family":"Overstreet","given":"Brandon","email":"boverstreet@usgs.gov","affiliations":[{"id":518,"text":"Oregon Water Science Center","active":true,"usgs":true}],"preferred":true,"id":948792,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Harrison, Lee R. 0000-0002-5219-9280","orcid":"https://orcid.org/0000-0002-5219-9280","contributorId":361416,"corporation":false,"usgs":false,"family":"Harrison","given":"Lee","middleInitial":"R.","affiliations":[{"id":18933,"text":"NOAA Southwest Fisheries Science Center","active":true,"usgs":false}],"preferred":false,"id":948793,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
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