Geology of the Mount Rogers area, revisited: Evidence of Neoproterozoic continental rifting, glaciation, and the opening and closing of the Iapetus Ocean, Blue Ridge, VA–NC–TN
Arthur J. Merschat, Ryan J. McAleer, Christopher S. Holm-Denoma, C. Scott Southworth
2023, Conference Paper
Recent field and geochronological studies in eight 7.5-minute quadrangles near Mount Rogers in Virginia, North Carolina and Tennessee recognize (1) important stratigraphic and structural relationships for the Neoproterozoic Mount Rogers and Konnarock Formations, and the northeast end of the Mountain City window; (2) the separation of Mesoproterozoic rocks of the...
Resistivity imaging over porphyry copper systems in the Red Mountain district, southwest Colorado, USA
Eric D. Anderson, Maryla Deszcz-Pan, Douglas Yager, Kyle Eastman, Bennett Eugene Hoogenboom
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
The Red Mountain district in southwestern Colorado produced base and precious metals hosted in breccia pipes and vein structures related to an extensive lithocap that overlies pervasive quartz-sericite-pyrite alteration. A helicopter-borne time-domain electromagnetic survey flown over the district yielded resistivity values that range from tens to thousand or more ohm-m,...
Reconnaissance mineral and cathodoluminescence studies of gold occurrences in the Pogo-Black Mountain area, eastern interior Alaska, USA
Garth E. Graham, Erin E. Marsh, Heather A. Lowers, Ryan D. Taylor
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
The Pogo Au deposit is the largest of a number of gold occurrences in eastern interior Alaska, that occur along a broad trend from west of Pogo to Black Mountain. Some of these occurrences are hosted in amphibolite facies gneisses and others in mid-Cretaceous igneous rocks that intruded the older...
Critical minerals: Germanium and cobalt in the Bornite deposit, southwestern Brooks Range, Alaska
Katharina Pfaff, Garth E. Graham, Alex Jones, Karen D. Kelley
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
Increasing demand for Ge and Co has led to a renewed interest and focus on advancing our understanding of the occurrence, distribution, and sequestration of these critical elements in known ore deposits. A workflow using a variety of analytical techniques and co-registered datasets has been developed and was applied to...
National- to continental-scale governmental geophysical efforts for critical mineral mapping, USA
Anne E. McCafferty, Chelsea Morgan Amaral, Garth E. Graham
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
The U.S. Geological Survey (USGS) has established robust collaborations with domestic state and international geological surveys to provide geophysical and other types of earth science data that act to underpin critical mineral research efforts across the United States, Canada, and Australia. The Earth Mapping Resource Initiative (EMRI) is a...
The Mount Weld rare earth element deposit, Western Australia: A carbonatite-derived laterite
Philip Verplanck, Heather A. Lowers, Adam Boehlke, Jay M. Thompson, Ganesh Bhat, Cameron Mark Mercer
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
Carbonatite-hosted rare earth element (REE) deposits are the primary source of the world’s light REEs and have the potential to be a source of heavy REEs. The Mount Weld REE deposit in Western Australia is hosted in a lateritic sequence that reflects supergene enrichment of the underlying carbonatite complex. Similar...
Critical minerals in Climax-type magmatic-hydrothermal systems
Celestine N. Mercer, Mario A Guzman, Albert H. Hofstra, Joshua Mark Rosera
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
Today’s global economy is challenged to meet the growing demand for commodities used in existing and emerging advanced technologies. Critical minerals are commodities found in a wide variety of ore deposits that are vital to the economic or national security of individual nations that are vulnerable to supply disruption. The...
James Tributary summary: A summary of trends in tidal water quality and associated factors, 1985-2021
Breck Maura Sullivan, Kaylyn Gootman, Alex Gunnerson, Cindy Johnson, Christopher A. Mason, Elgin Perry, Gopal Bhatt, Jennifer L. Keisman, James S. Webber, Jon Harcum, Mike Lane, Olivia Devereux, Qian Zhang, Rebecca Murphy, Renee Karrh, Tom Butler, Vanessa Van Note, Zhaoying Wei
2023, Report
The James Tributary Summary outlines change over time for a suite of monitored tidal water quality parameters and associated potential drivers of those trends for the period 1985 – 2021 and provides a brief description of the current state of knowledge explaining these observed changes. Water quality parameters described include...
Preliminary documentation of coseismic ground failure triggered by the February 6, 2023 Türkiye earthquake sequence
Tolga Gorum, Hakan Tanyas, Furkan Karabacak, Abdussamet Yilmaz, Serkan Girgin, Kate E. Allstadt, M. Lutfi Suzen, Paula Madeline Burgi
2023, Engineering Geology (327)
The devastating Kahramanmaraş earthquake sequence occurred on February 6, 2023. Two main events, Mw 7.8 and Mw 7.5 occurred 9 hours apart, affected 11 cities in Turkey, and subjected an area of ∼90,000 km2 to shaking levels known to trigger landslides (peak ground acceleration > 0.08 g). Extensive landsliding was expected given the hilly terrain affected by...
Increasing ocean wave energy observed in Earth’s seismic wavefield since the late 20th century
Richard C. Aster, Adam T. Ringler, Robert E. Anthony, Thomas A. Lee
2023, Nature Communications (14)
Ocean waves excite continuous globally observable seismic signals. We use data from 52 globally distributed seismographs to analyze the vertical component primary microseism wavefield at 14–20 s period between the late 1980s and August 2022. This signal is principally composed of Rayleigh waves generated by ocean wave seafloor tractions at...
Developing a stochastic hydrological model for informing lake water level drawdown management
Xinchen He, Konstantinos Andreadisa, Allison H. Roy, Abhiskek Kumar, Caitlyn Butler
2023, Journal of Environmental Management (345)
Winter drawdown (WD) is a common lake management tool for multiple purposes such as flood control, aquatic vegetation reduction, and lake infrastructure maintenance. To minimize adverse impacts to a lake’s ecosystem, regulatory agencies may provide managers with general guidelines for drawdown and refill timing, drawdown magnitude, and outflow limitations. However,...
Spatially interactive modeling of land change identifies location-specific adaptations most likely to lower future flood risk
Georgina M. Sanchez, Anna Petrasova, Megan M. Skrip, Elyssa Collins, Margaret A. Lawrimore, John B. Vogler, Adam Terando, Jelena Vukomanovic, Helena Mitasova, Ross K. Meentemeyer
2023, Scientific Reports (13)
Impacts of sea level rise will last for centuries; therefore, flood risk modeling must transition from identifying risky locations to assessing how populations can best cope. We present the first spatially interactive (i.e., what happens at one location affects another) land change model (FUTURES 3.0) that can probabilistically predict urban...
Importance of understanding bottom-up control when characterizing geothermal systems
Jared R. Peacock, Paul A. Bedrosian
2023, Conference Paper, Using the Earth to save the Earth (GRC transactions)
Methods designed to identify favorable areas for geothermal resources have traditionally been focused on near-surface information, namely data that can be compiled into a 2D map. However, these methods fail to account for the third dimension: depth. As a result, they do not incorporate deep crustal and mantle features like...
Geophysical logging For hydrogeology
John Williams, Frederick L. Paillet
2023, Book
Geophysical logging is the measurement and analysis of electrical, acoustic, nuclear, and other physical properties in a borehole using wireline or direct push technology. Geophysical logging is one of the primary methods of collecting subsurface information for hydrogeologic investigations. Groundwater scientists and engineers should have a basic understanding of borehole geophysics...
Exploring centennial barrier-inlet evolution: Insights from undeveloped and developed phases at Barnegat Inlet, New Jersey
Shane Nichols-O’Neill, Jorge Lorenzo-Trueba, Daniel J. Ciarletta, Jennifer L. Miselis
2023, Conference Paper, The Proceedings of the Coastal Sediments 2023
This study aims to identify the natural processes and the subsequent responses to coastal engineering and development on the alongshore evolution of the IB-BI-LBI inlet-barrier system. The primary focus will be the quantification of barrier island and inlet sediment partitioning at decadal to centennial timescales, from 1839-1941. We analyze historical...
Vital sign monitoring is good medicine for parks
Andrew M. Ray, David P. Thoma, Kristin L. Legg, Robert H. Diehl, Adam Sepulveda, Mike Tercek, Robert Al-Chokhachy
2023, Yellowstone Science
Nearly 70 years ago a young ranger naturalist working in Yellowstone National Park (YNP), Frederick B. Turner, became fascinated with the abundance of frogs next to his cabin at “Soldier Creek” (known as Lodge Creek today). This interest blossomed into Turner’s PhD research and his publication in 1960 about the...
The Arctic Rivers Project: Using an equitable co-production framework for integrating meaningful community engagement and science to understand climate impacts
Nicole M. Herman-Mercer, Alestine Andre, Victoria Buschman, Dylan Blaskey, Cassandra M. Brooks, Yifan Cheng, Evelynn Combs, Karen Cozzetto, Serena Fitka, Joshua C. Koch, Aine Lawlor, Elizabeth Moses, Emily Murray, Edda A. Mutter, Andrew Newman, Charles Prince, Patricia Salmon, Jenessa Tlen, Ryan C. Toohey, Michael L. Williams, Keith Musselman
2023, Community Science (2)
As the Arctic and its rivers continue to warm, a better understanding of the possible future impacts on people would benefit from close partnership with Indigenous communities and scientists from diverse fields of study. We present efforts by the Arctic Rivers Project to conduct community-engaged research to...
Evaluating a tandem human-machine approach to labelling of wildlife in remote camera monitoring
Laurence A. Clarfeld, Alexej P.K. Sirén, Brendan M. Mulhall, Tammy L. Wilson, Elena Bernier, John Farrell, Gus Lunde, Nicole Hardy, Katherine D. Gieder, Robert Abrams, Sue Staats, Scott McLellan, Therese M. Donovan
2023, Ecological Informatics (77)
Remote cameras (“trail cameras”) are a popular tool for non-invasive, continuous wildlife monitoring, and as they become more prevalent in wildlife research, machine learning (ML) is increasingly used to automate or accelerate the labor-intensive process of labelling (i.e., tagging) photos. Human-machine hybrid tagging approaches have been shown to greatly increase...
A novel boat-based field application of a high-frequency conductometric ammonium analyzer to characterize spatial variation in aquatic ecosystems
Emily T. Richardson, Angela Hansen, Tamara E. C. Kraus, Bryan D. Downing, Don Forsberg, John Stillian, Katy O’Donnell, Crystal Lee Sturgeon, Brian A. Bergamaschi
2023, Limnology and Oceanography Methods (21) 761-774
Documenting dissolved inorganic nitrogen (DIN) concentration and form at appropriate temporal and spatial scales is key to understanding aquatic ecosystem health, particularly as DIN fuels primary productivity. In addition to point and non-point source nutrient inputs, factors such as hydrology, geomorphology, temperature, light, and biogeochemical transformations influence nutrient dynamics in...
Development of small uncrewed aerial systems for multi-instrument geophysical data acquisition in active geothermal systems
Grant Harold Rea-Downing, Claire Bouligand, Jonathan M.G. Glen, Tait E. Earney, Laurie A. Zielinski, Jacob Elliott Anderson, Peter J. Kelly
2023, Conference Paper, 2023 Summit on Drone Geophysics program book
Small Uncrewed Aerial Systems (sUAS) serve as critical platforms for geophysical data collection at an intermediate scale between lower resolution, regional datasets collected via crewed aerial surveys, and high resolution, but spatially sparse sampling of ground-based data collection methods. Advances in sensor design and sUAS capabilities have led to rapid...
U.S. Geological Survey risk research community of practice 2021 workshop report—Workshop on considering equitable engagement in research design
Emily Brooks, Alice Pennaz, Matthew Jurjonas
2023, Open-File Report 2023-1072
The U.S. Geological Survey (USGS) Risk Research and Applications Community of Practice (Risk CoP) is a bureau-wide forum to share resources and discuss issues relevant to “conducting and applying scientific research in hazards—the dangerous processes or phenomena that may cause damage—to enhance the reduction of risk—the potential for societally relevant...
Decadal shifts in the population growth, regeneration, and health of Taxodium distichum in swamps of the Cache River Watershed, Illinois
Beth Middleton, Darren Johnson
2023, Journal for Nature Conservation (76)
Population projection models based on long-term trends in regeneration and tree survival can be used to predict the future stability of swamp forest species using water management. Population growth and regeneration of a foundational tree species in North American cypress swamps (Taxodium distichum) were compared...
Trade-offs in adapting to changes in climate, land use, and water availability in California
Nathan D. Van Schmidt, Tamara Wilson, Lorraine E. Flint, R. Langridge
2023, Ecology and Society (28)
Changes in land use and land cover, water systems, and climate are inextricably linked, and their combined stresses have had severe impacts in many regions worldwide. Integrated adaptation planning can support adaptive capacity by helping institutions manage land and water resources at regional to local scales. Linkages between these stressors...
The dynamic influence of subsurface geological processes on the assembly and diversification of thermophilic microbial communities in continental hydrothermal systems
Kenneth W.W. Sims, Cole M. Messa, Sean R Scott, Andrew D Parsekian, Andrew Miller, Abraham L. Role, Timothy P. Moloney, Everett L. Shock, Jacob B. Lowenstern, R. Blaine McCleskey, Matthew A. Charette, Bradley Carr, Sylvain Pasquet, Henry Heasler, Cheryl Jaworowski, W. Steven Holbrook, Melody R. Lindsay, Daniel R. Colman, Eric S. Boyd
2023, Geochimica et Cosmochimica Acta (362) 77-103
An accepted paradigm of hydrothermal systems is the process of phase separation, or boiling, of a deep, homogeneous hydrothermal fluid as it ascends through the subsurface resulting in gas rich and gas poor fluids. While phase separation helps to explain first-order patterns in the chemistry and biology of a hot...
Incremental evolution of modeling a prognosis for polar bears in a rapidly changing Arctic
Bruce G. Marcot, Todd C. Atwood, David C. Douglas, Jeffrey F. Bromaghin, Anthony M. Pagano, Steven C. Amstrup
2023, Ecological Indicators (156)
Updating predictions of the response of high-profile, at-risk species to climate change and anthropogenic stressors is vital for informing effective conservation action. Here, we review two prior generations of Bayesian network probability models predicting changes in global polar bear (Ursus maritimus) population status, and provide...
