A preliminary appraisal was conducted in and near the ancestral Missouri River valley in northeastern Montana to describe the groundwater resources and to establish a data base for the area. The data base then could be used for future evaluation of possible changes in water levels or water quality. In this area, consolidated aquifers are the Upper Cretaceous Fox Hills-lower Hell Creek aquifer and the overlying Paleocene Fort Union Formation. Unconsolidated aquifers are Pleistocene terrace gravel and glacial deposits and Holocene alluvial deposits. Aquifers are recharged by precipitation, infiltration of streamflow, and possibly leakage from lakes and potholes. Groundwater moves from topographically higher areas to the ancestral valley, then along the ancestral valley to the southwest. Water is discharged from aquifers by evapotranspiration, springs and seeps, movement directly into streams and lakes, and from pumping wells. Average well yields are greatest for irrigation wells completed in outwash gravel (886 gallons/min). Eighteen wells were completed in various aquifers to monitor potential long-term changes in water levels and water quality. Measured water levels declined about 2 ft. or less during the study (1982-85). Chemical analysis of groundwater samples indicated that concentrations of some dissolved constituents exceeded U.S. Environmental Protection Agency standards for drinking water.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri864138","usgsCitation":"Levings, G.W., 1986, Preliminary appraisal of ground water in and near the ancestral Missouri River Valley, northeastern Montana: U.S. Geological Survey Water-Resources Investigations Report 86-4138, Report: iv, 41 p.; 4 Plates: 12.46 x 19.92 inches or smaller, https://doi.org/10.3133/wri864138.","productDescription":"Report: iv, 41 p.; 4 Plates: 12.46 x 19.92 inches or smaller","costCenters":[],"links":[{"id":415087,"rank":7,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_36570.htm","linkFileType":{"id":5,"text":"html"}},{"id":57144,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1986/4138/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":57143,"rank":6,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/wri/1986/4138/plate-4.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":57142,"rank":5,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/wri/1986/4138/plate-3.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":57141,"rank":4,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/wri/1986/4138/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":57140,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/wri/1986/4138/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":158494,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1986/4138/report-thumb.jpg"}],"country":"United States","state":"Montana","otherGeospatial":"Missouri River Valley","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -104.624,\n 48.911\n ],\n [\n -104.624,\n 48.373\n ],\n [\n -104.054,\n 48.373\n ],\n [\n -104.054,\n 48.911\n ],\n [\n -104.624,\n 48.911\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac9e4b07f02db67ca7b","contributors":{"authors":[{"text":"Levings, G. W.","contributorId":12485,"corporation":false,"usgs":true,"family":"Levings","given":"G.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":199610,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":26661,"text":"wri844213 - 1986 - Hydrogeology and ground-water quality of Lannon-Sussex area, northeastern Waukesha County, Wisconsin","interactions":[],"lastModifiedDate":"2023-03-14T18:15:21.378931","indexId":"wri844213","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"84-4213","title":"Hydrogeology and ground-water quality of Lannon-Sussex area, northeastern Waukesha County, Wisconsin","docAbstract":"The Silurian dolomite aquifer in the Lannon-Sussex area of southeastern Wisconsin is overlain by glacial deposits, but is within 8 ft of the land surface over 15% of the study area. The proximity of the dolomite aquifer to the land surface makes it susceptible to contamination from man 's activities. Water from the aquifer was analyzed and several characteristics were monitored in a 30-sq-mi area of Waukesha County, including: water temperature, calcium, magnesium, potassium, strontium, alkalinity, chlorides, fluorides, sulfates, nitrites, nitrates, nitrogen, iron, manganese, hardness, and pH.
The water is hard, commonly having a hardness of more than 350 mg/L as CaCO3, and high in iron, commonly containing more than 0.3 mg/L. However, nutrient concentrations are not high; nitrogen, greater than 8 mg/L; phosphorus, none detected; and potassium, greater than 4 mg/L. The chloride content of the water averages more than 50 mg/L indicating contamination probably from septic systems. The water quality varies over a time. High concentrations of chloride and, occasionally, of bacteria correlate with periods of groundwater recharge over a period of 17 months. Chloride concentrations were highest in water from wells where housing density is high.
An attempt was made to relate water quality changes with depth to beds of cherty dolomite that are identified in geologic logs; it was postulated that these zones might be confining beds. Although the beds appear to extend over the area, no evidence was found that they are confining beds, other than reports of a few artesian wells. Water quality, indicated by chloride content, showed no significant relation to well bottom altitudes, casing bottom altitude, or well depth.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri844213","collaboration":"Prepared in cooperation with the University of Wisconsin-Extension, Geological and Natural History Survey and the Wisconsin Department of Natural Resoources","usgsCitation":"Cotter, R.D., 1986, Hydrogeology and ground-water quality of Lannon-Sussex area, northeastern Waukesha County, Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 84-4213, 28 p., https://doi.org/10.3133/wri844213.","productDescription":"28 p.","numberOfPages":"27","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":677,"text":"Wisconsin Water Science Center","active":true,"usgs":true}],"links":[{"id":55532,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1984/4213/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":123385,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1984/4213/report-thumb.jpg"},{"id":414108,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_36070.htm","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Wisconsin","county":"Waukesha County","otherGeospatial":"Lannon-Sussex area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -88.275,\n 43.083\n ],\n [\n -88.275,\n 43.193\n ],\n [\n -88.14,\n 43.193\n ],\n [\n -88.14,\n 43.083\n ],\n [\n -88.275,\n 43.083\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a4de4b07f02db6276cb","contributors":{"authors":[{"text":"Cotter, R. D.","contributorId":89874,"corporation":false,"usgs":true,"family":"Cotter","given":"R.","email":"","middleInitial":"D.","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":196792,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":28149,"text":"wri854068 - 1986 - Effects of urbanization on streamflow, sediment loads, and channel morphology in Pheasant Branch basin near Middleton, Wisconsin","interactions":[],"lastModifiedDate":"2023-04-07T21:11:33.502893","indexId":"wri854068","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"85-4068","title":"Effects of urbanization on streamflow, sediment loads, and channel morphology in Pheasant Branch basin near Middleton, Wisconsin","docAbstract":"A 5-year, data-collection and modeling study was conducted on Pheasant Branch basin in and near Middleton, Wisconsin. The objectives of the study were to: (1) describe the streamflow characteristics, sediment transport, and stream-channel morphology in the Pheasant Branch basin; and (2) relate the above factors to changes caused by urbanization and project the effect of urbanization on the hydrology and channel morphology of the study area.
\n\n
Streamflow data were collected at five sites for 4 years in the basin to defme present streamflow conditions. Suspended-sediment data also were collected at these sites. In addition, periodic surveys of monumented channel cross sections were made and compared with a survey from an earlier study to document changes in the channel over a period of 10 years.
\nThe suspended-sediment data show a decrease in suspended-sediment load through the fully urbanized reach of the stream in 3 of the 4 years studied. This corresponds with the slight net decrease in cross-section area in this reach for the same period. Possible explanations for the decrease in suspended-sediment loads through this reach include (1) sediment being trapped at the five drop structures and the Park Street erosion-control structure and (2) sediment being deposited in overbank areas throughout the reach. Farther downstream, the suspended-sediment load decreased through the Pheasant Branch marsh during a year of high flow but increased through the marsh in 2 of the 3 years for which complete data are available. The marsh is not acting as a net sediment trap in some years.
\nA rainfall-runoff model was calibrated and verified for the basin upstream from U.S. Highway 12. This model was used to simulate 68 years of summer flood hydrographs for three conditions: Current land use, projected urban development, and complete urban development of all lands in the basin. Analysis of simulated flood flows indicates that projected urban development would double the mean annual flood peaks at U.S. Highway 12. Complete development of the basin would increase the mean annual flood peak by a factor of 2.4.
\nFrom 1971 to 1977, the mean streambed elevation lowered by almost 2 feet, and the mean channel width increased by more than 35 percent in the reach downstream from the fully urbanized part of the basin. In other reaches, the mean streambed elevation lowered by more than a foot. Changes in channel cross sections after 1977 were smaller.
\nIncreases in flood flow would tend to enlarge the channel. An increase in the mean annual flood by a factor of 2. 0 to 2.4 will cause a 40 to 50 percent increase in channel width and a 30 to 40 percent increase in channel depth.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri854068","collaboration":"Prepared in cooperation with the University of Wisconsin-Extension, Geological and Natural History Survey and the City of Middleton","usgsCitation":"Krug, W., and Goddard, G.L., 1986, Effects of urbanization on streamflow, sediment loads, and channel morphology in Pheasant Branch basin near Middleton, Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 85-4068, vi, 82 p., https://doi.org/10.3133/wri854068.","productDescription":"vi, 82 p.","numberOfPages":"94","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":677,"text":"Wisconsin Water Science Center","active":true,"usgs":true}],"links":[{"id":415474,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_36247.htm","linkFileType":{"id":5,"text":"html"}},{"id":123391,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1985/4068/report-thumb.jpg"},{"id":56979,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1985/4068/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Wisconsin","county":"Dane County","city":"Middleton","otherGeospatial":"Pheasant Branch","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -89.589,\n 43.049\n ],\n [\n -89.589,\n 43.16\n ],\n [\n -89.469,\n 43.16\n ],\n [\n -89.469,\n 43.049\n ],\n [\n -89.589,\n 43.049\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a26e4b07f02db60fd46","contributors":{"authors":[{"text":"Krug, W.R.","contributorId":23147,"corporation":false,"usgs":true,"family":"Krug","given":"W.R.","email":"","affiliations":[],"preferred":false,"id":199300,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Goddard, G. L.","contributorId":10442,"corporation":false,"usgs":true,"family":"Goddard","given":"G.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":199299,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70015330,"text":"70015330 - 1986 - Determination of Ca, Mg, Na, Cd, Cu, Fe, K, Li and Zn in acid mine and reference water samples by inductively coupled plasma atomic fluorescence spectrometry","interactions":[],"lastModifiedDate":"2025-09-23T15:55:39.638845","indexId":"70015330","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3541,"text":"The Analyst","active":true,"publicationSubtype":{"id":10}},"title":"Determination of Ca, Mg, Na, Cd, Cu, Fe, K, Li and Zn in acid mine and reference water samples by inductively coupled plasma atomic fluorescence spectrometry","docAbstract":"An inductively coupled plasma atomic fluorescence spectrometric (ICP-AFS) method was used for the determination of nine elements in natural water. Reference and acid mine water samples were analysed by this method to demonstrate its usefulness for hydrogeochemical exploration. The elements were determined in two groups based on the compatibility of operating conditions and consideration of element abundance levels in natural water. Ca, Mg and Na were determined as a group using one set of instrumental conditions and a 1 + 99 dilution of the sample, and Cd, Cu, Fe, K, Li and Zn were determined using another set of conditions and the undiluted sample. The detection limits for the elements are as follows: Ca, 1.4; Mg, 1.7; Na, 2.0; Cd, 1.8; Cu, 6.2; Fe, 15.8; K, 3.5; Li, 0.3; and Zn, 1.2 ng ml–1. Each element has a linear range spanning about four orders of magnitude. The method has good precision and accuracy, as shown by statistics on replicate analyses and by the agreement between values obtained and those recommended for the reference water samples, and also those obtained by atomic absorption spectrometry for the acid mine water samples.
","language":"English","publisher":"Royal Society of Chemistry","doi":"10.1039/AN9861100645","issn":"00032654","usgsCitation":"Sanzolone, R.F., and Meier, A.L., 1986, Determination of Ca, Mg, Na, Cd, Cu, Fe, K, Li and Zn in acid mine and reference water samples by inductively coupled plasma atomic fluorescence spectrometry: The Analyst, v. 111, no. 6, p. 645-649, https://doi.org/10.1039/AN9861100645.","productDescription":"5 p.","startPage":"645","endPage":"649","numberOfPages":"5","costCenters":[],"links":[{"id":223928,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"111","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ff87e4b0c8380cd4f23f","contributors":{"authors":[{"text":"Sanzolone, R. F.","contributorId":64199,"corporation":false,"usgs":true,"family":"Sanzolone","given":"R.","middleInitial":"F.","affiliations":[],"preferred":false,"id":370656,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Meier, A. L.","contributorId":81480,"corporation":false,"usgs":true,"family":"Meier","given":"A.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":370657,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014897,"text":"70014897 - 1986 - EFFECTS OF ARTIFICIAL RECHARGE ON GROUND-WATER QUALITY, LONG ISLAND, NEW YORK.","interactions":[],"lastModifiedDate":"2012-03-12T17:19:28","indexId":"70014897","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"EFFECTS OF ARTIFICIAL RECHARGE ON GROUND-WATER QUALITY, LONG ISLAND, NEW YORK.","docAbstract":"Artificial-recharge experiments were conducted at East Meadow in central Nassau County, Long Island, N. Y. , from October 1982 through January 1984, to evaluate the degree of ground-water mounding and chemical effects of artificially replenishing the ground-water system with tertiary-treated wastewater. Reclaimed water was provided by the Cedar Creek wastewater-treatment plant in Wantagh. Recharge with reclaimed water increased the concentration of sodium and chloride in ground water but lowered the concentrations of total nitrogen (nitrate plus nitrite) and some low-molecular-weight hydrocarbons. Reclaimed water was well within the New York State effluent standards for ground-water recharge. Specific-conductance measurements and Stiff diagrams of chemical analyses were used to help define the extent and shape of the plume formed by reclaimed water.","conferenceTitle":"Water Forum '86: World Water Issues in Evolution, Proceedings of the Conference.","conferenceLocation":"Long Beach, CA, USA","language":"English","publisher":"ASCE","publisherLocation":"New York, NY, USA","isbn":"0872625451","usgsCitation":"Schneider, B.J., Ku, H.F., and Oaksford, E.T., 1986, EFFECTS OF ARTIFICIAL RECHARGE ON GROUND-WATER QUALITY, LONG ISLAND, NEW YORK., Water Forum '86: World Water Issues in Evolution, Proceedings of the Conference., Long Beach, CA, USA, p. 628-636.","startPage":"628","endPage":"636","numberOfPages":"9","costCenters":[],"links":[{"id":225283,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0458e4b0c8380cd5090d","contributors":{"authors":[{"text":"Schneider, Brian J.","contributorId":55580,"corporation":false,"usgs":true,"family":"Schneider","given":"Brian","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":369554,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ku, Henry F. H.","contributorId":11258,"corporation":false,"usgs":true,"family":"Ku","given":"Henry","email":"","middleInitial":"F. H.","affiliations":[],"preferred":false,"id":369553,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Oaksford, Edward T.","contributorId":82693,"corporation":false,"usgs":true,"family":"Oaksford","given":"Edward","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":369555,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014896,"text":"70014896 - 1986 - FLOOD REDUCTION EFFICIENCY OF THE WATER-MANAGEMENT SYSTEM IN DADE COUNTY (MIAMI), FLORIDA.","interactions":[],"lastModifiedDate":"2012-03-12T17:19:28","indexId":"70014896","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"FLOOD REDUCTION EFFICIENCY OF THE WATER-MANAGEMENT SYSTEM IN DADE COUNTY (MIAMI), FLORIDA.","docAbstract":"Two tropical weather systems, Hurricane Donna (1960) and Tropical Storm Dennis (1981), produced nearly equivalent amounts of rainfall in a 48-hour period south of the Miami (Florida) area. These two systems caused extensive flooding over a 600-square mile area, which is primarily agricultural and low density residential. The 1960 and 1981 storms caused the highest water levels recorded in south Dade County since flood-control measures were initiated for south Florida in 1949. Ground-water levels during both storms rose 4 to 8 feet over most of the area causing widespread inundation. Operation of the water-management system in 1981 provided flood protection and rapid recession of ground-water levels thereby minimizing damage.","conferenceTitle":"Water Forum '86: World Water Issues in Evolution, Proceedings of the Conference.","conferenceLocation":"Long Beach, CA, USA","language":"English","publisher":"ASCE","publisherLocation":"New York, NY, USA","isbn":"0872625451","usgsCitation":"Waller, B.G., 1986, FLOOD REDUCTION EFFICIENCY OF THE WATER-MANAGEMENT SYSTEM IN DADE COUNTY (MIAMI), FLORIDA., Water Forum '86: World Water Issues in Evolution, Proceedings of the Conference., Long Beach, CA, USA, p. 897-902.","startPage":"897","endPage":"902","numberOfPages":"6","costCenters":[],"links":[{"id":225282,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0e7ae4b0c8380cd53491","contributors":{"authors":[{"text":"Waller, Bradley G.","contributorId":83492,"corporation":false,"usgs":true,"family":"Waller","given":"Bradley","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":369552,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014894,"text":"70014894 - 1986 - Regression approximations for transport model constraint sets in combined aquifer simulation-optimization studies","interactions":[],"lastModifiedDate":"2018-02-14T08:42:15","indexId":"70014894","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","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":"Regression approximations for transport model constraint sets in combined aquifer simulation-optimization studies","docAbstract":"Problems involving the combined use of contaminant transport models and nonlinear optimization schemes can be very expensive to solve. This paper explores the use of transport models with ordinary regression and regression on ranks to develop approximate response functions of concentrations at critical locations as a function of pumping and recharge at decision wells. These response functions combined with other constraints can often be solved very easily and may suggest reasonable starting points for combined simulation-management modeling or even relatively efficient operating schemes in themselves.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/WR022i004p00581","usgsCitation":"Alley, W.M., 1986, Regression approximations for transport model constraint sets in combined aquifer simulation-optimization studies: Water Resources Research, v. 22, no. 4, p. 581-586, https://doi.org/10.1029/WR022i004p00581.","productDescription":"6 p.","startPage":"581","endPage":"586","costCenters":[],"links":[{"id":225280,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"22","issue":"4","noUsgsAuthors":false,"publicationDate":"2010-07-09","publicationStatus":"PW","scienceBaseUri":"505a933fe4b0c8380cd80cdc","contributors":{"authors":[{"text":"Alley, William M. walley@usgs.gov","contributorId":1661,"corporation":false,"usgs":true,"family":"Alley","given":"William","email":"walley@usgs.gov","middleInitial":"M.","affiliations":[{"id":502,"text":"Office of Surface Water","active":true,"usgs":true}],"preferred":false,"id":369549,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014892,"text":"70014892 - 1986 - Dissolved organic matter in anoxic pore waters from Mangrove Lake, Bermuda","interactions":[],"lastModifiedDate":"2024-04-03T14:51:35.55465","indexId":"70014892","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Dissolved organic matter in anoxic pore waters from Mangrove Lake, Bermuda","docAbstract":"Dissolved organic matter and dissolved inorganic chemical species in anoxic pore water from Mangrove Lake, Bermuda sediments were studied to evaluate the role of pore water in the early diagenesis of organic matter. Dissolved sulphate, titration alkalinity, phosphate, and ammonia concentration versus depth profiles were typical of many nearshore clastic sediments and indicated sulphate reduction in the upper 100 cm of sediment. The dissolved organic matter in the pore water was made up predominantly of large molecules, was concentrated from large quantities of pore water by using ultrafiltration and was extensively tudied by using elemental and stable carbon isotope analysis and high-resolution, solid state 13C nuclear magnetic resonance and infrared spectroscopy. The results indicate that this material has a predominantly polysaccharide-like structure and in addition contains a large amount of oxygen-containing functional groups (e.g., carboxyl groups). The 13C nulcear magnetic resonance spectra of the high-molecular-weight dissolved organic matter resemble those of the organic matter in the surface sediments of Mangrove Lake. We propose that this high-molecular-weight organic matter in pore waters represents the partially degraded, labile organic components of the sedimentary organic matter and that pore waters serve as a conduit for removal of these labile organic components from the sediments. The more refractory components are, thus, selectively preserved in the sediments as humic substances (primarily humin).
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(86)90109-2","issn":"00167037","usgsCitation":"Orem, W., Hatcher, P.G., Spiker, E., Szeverenyi, N., and Maciel, G., 1986, Dissolved organic matter in anoxic pore waters from Mangrove Lake, Bermuda: Geochimica et Cosmochimica Acta, v. 50, no. 4, p. 609-618, https://doi.org/10.1016/0016-7037(86)90109-2.","productDescription":"10 p.","startPage":"609","endPage":"618","numberOfPages":"10","costCenters":[],"links":[{"id":226254,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"50","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0239e4b0c8380cd4ff5e","contributors":{"authors":[{"text":"Orem, W. H. 0000-0003-4990-0539","orcid":"https://orcid.org/0000-0003-4990-0539","contributorId":93084,"corporation":false,"usgs":true,"family":"Orem","given":"W. H.","affiliations":[],"preferred":false,"id":369545,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hatcher, Patrick G.","contributorId":93625,"corporation":false,"usgs":true,"family":"Hatcher","given":"Patrick","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":369546,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Spiker, E.C.","contributorId":103275,"corporation":false,"usgs":true,"family":"Spiker","given":"E.C.","affiliations":[],"preferred":false,"id":369547,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Szeverenyi, N.M.","contributorId":83663,"corporation":false,"usgs":true,"family":"Szeverenyi","given":"N.M.","email":"","affiliations":[],"preferred":false,"id":369544,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Maciel, G.E.","contributorId":43910,"corporation":false,"usgs":true,"family":"Maciel","given":"G.E.","email":"","affiliations":[],"preferred":false,"id":369543,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70014869,"text":"70014869 - 1986 - Seismically induced landslides: current research by the US Geological Survey.","interactions":[],"lastModifiedDate":"2012-03-12T17:19:34","indexId":"70014869","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1774,"text":"Geologia Applicata e Idrogeologia","active":true,"publicationSubtype":{"id":10}},"title":"Seismically induced landslides: current research by the US Geological Survey.","docAbstract":"We have produced a regional seismic slope-stability map and a probabilistic prediction of landslide distribution from a postulated earthquake. For liquefaction-induced landslides, in situ measurements of seismically induced pore-water pressures have been used to establish an elastic model of pore pressure generation. -from Authors","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geologia Applicata e Idrogeologia","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"04353870","usgsCitation":"Harp, E.L., Wilson, R.C., Keefer, D.K., and Wieczorek, G.F., 1986, Seismically induced landslides: current research by the US Geological Survey.: Geologia Applicata e Idrogeologia, v. 21, no. 2, p. 159-173.","startPage":"159","endPage":"173","numberOfPages":"15","costCenters":[],"links":[{"id":225857,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"21","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8b88e4b08c986b3178df","contributors":{"authors":[{"text":"Harp, E. L.","contributorId":59026,"corporation":false,"usgs":true,"family":"Harp","given":"E.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":369484,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wilson, R. C.","contributorId":50889,"corporation":false,"usgs":true,"family":"Wilson","given":"R.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":369483,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Keefer, D. K.","contributorId":21176,"corporation":false,"usgs":true,"family":"Keefer","given":"D.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":369481,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wieczorek, G. F.","contributorId":50143,"corporation":false,"usgs":true,"family":"Wieczorek","given":"G.","middleInitial":"F.","affiliations":[],"preferred":false,"id":369482,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70014867,"text":"70014867 - 1986 - The Schwarzwalder uranium deposit, III: Alteration, vein mineralization, light stable isotopes, and genesis of the deposit","interactions":[],"lastModifiedDate":"2024-01-05T17:53:56.035825","indexId":"70014867","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"The Schwarzwalder uranium deposit, III: Alteration, vein mineralization, light stable isotopes, and genesis of the deposit","docAbstract":"The Schwartzwalder uranium deposit formed at 69.3 + or - 1.1 m.y. in a complex fracture system during the inception of Laramide uplift of the Front Range in Colorado. Geologic and isotopic evidence demonstrates that the ore-forming fluids were in chemical equilibrium with the Proterozoic metavolcanic and metasedimentary host-rock terrane at depth and that the metals, sulfur, and carbonate deposited in the fractures were derived from the metamorphic rocks. The data are not consistent with chemical contributions from an unrecognized magma or from the overlying Phanerozoic sedimentary rocks. The protoliths for the metamorphic rocks were submarine volcanic rocks and related volcanogenic exhalative iron-formations and chert. Water trapped along the basement faults and in the regolith between the basement and the overlying Paleozoic sedimentary rocks interacted with the metavolcanic rocks to produce isotopically heavy fluids containing high concentrations of dissolved metals and carbonate. Calculated delta 18 O values for this fluid range from 4.3 to 8.2 per mil, indicating a low water/rock ratio in the source terrane.Two stages of alteration and three stages of vein mineralization are recorded in the Schwartzwalder deposit. At the onset of Laramide faulting, fluids migrated along the fracture systems to zones of low hydraulic potential. These fluids contained CO 2 and had a metastably large K/Na ratio; they altered the gneissic wall rocks to a carbonate-sericite assemblage, adding K (super +) and CO 2 and removing SiO 2 with little or no change in volume. As the fractures continued to open, CO 2 was evolved from the fluids, increasing the pH and superimposing a hematite-adularia alteration assemblage on the earlier alteration.The veins record three stages of mineralization, the second of which generated the high-grade uranium veins. Evidence for the stage I sulfide-carbonate mineralization is poorly preserved, but isotopic and temperature data from this stage are consistent with a trend in fluid composition culminating in stage II pitchblende deposition. Sudden, large movements along the faults caused episodic evolution of CO 2 from the fluid. This loss of CO 2 decreased the solubilities of carbonates and adularia and the stabilities of sulfur species in solution. Uranyl carbonate complexes dissociated and sulfur species in solution likely reduced the uranyl ions to produce stage II pitchblende. Carbonate, adularia, and sulfides dominated the vein mineralogy after deposition of pitchblende. Progressively lower delta 18 O values in vein carbonates suggest the mixing of cooler, less evolved, perhaps meteoric, waters during the later stages of mineralization. However, the fluid pressure remained high, as indicated by explosion breccias and inward collapse features which formed as fault movements produced sudden decreases in the confining pressure. Only the stage III carbonate-iron disulfide assemblage in the major postore segment of the Illinois fault may be the product of meteoric water alone.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.81.4.872","issn":"03610128","usgsCitation":"Wallace, A.R., and Whelan, J.F., 1986, The Schwarzwalder uranium deposit, III: Alteration, vein mineralization, light stable isotopes, and genesis of the deposit: Economic Geology, v. 81, no. 4, p. 872-888, https://doi.org/10.2113/gsecongeo.81.4.872.","productDescription":"17 p.","startPage":"872","endPage":"888","numberOfPages":"17","costCenters":[],"links":[{"id":225855,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"81","issue":"4","noUsgsAuthors":false,"publicationDate":"1986-07-01","publicationStatus":"PW","scienceBaseUri":"505ba8dde4b08c986b321ed9","contributors":{"authors":[{"text":"Wallace, A. R.","contributorId":59445,"corporation":false,"usgs":true,"family":"Wallace","given":"A.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":369478,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Whelan, J. F.","contributorId":45328,"corporation":false,"usgs":true,"family":"Whelan","given":"J.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":369477,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014866,"text":"70014866 - 1986 - Tidal reorientation and the fracturing of Jupiter's moon Europa","interactions":[],"lastModifiedDate":"2012-03-12T17:19:34","indexId":"70014866","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2840,"text":"Nature","active":true,"publicationSubtype":{"id":10}},"title":"Tidal reorientation and the fracturing of Jupiter's moon Europa","docAbstract":"The most striking characteristic of Europa is the network of long linear albedo markings over the surface, suggestive of global-scale tectonic processes. Various explanations for the fractures have been proposed: Freezing and expansion of an early liquid water ocean1, planetary expansion due to dehydration of hydrated silicates2, localization by weak points in the crust generated by impacts3, and a combination of stresses due to planetary volume change and tidal distortions from orbital recession and orbital eccentricity4,5. Calculations by Yoder6 and Greenberg and Weidenschilling7 have shown that Europa may rotate slightly more rapidly than the synchronous rate, with a rotation period (reorientation through 360??) ranging from 20 to >103 yr if a liquid mantle is present, or up to 1010 yr if the satellite is essentially solid7. Helfen-stein and Parmentier8 modelled the stresses due to nonsynchronous rotation, and concluded that this could explain the long fractures in part of the anti-jovian hemisphere. In this note, I present a global map of lineaments with long arc lengths (>20?? or 550 km), and compare the lineament orientations to the tensile stress trajectories due to tidal distortions (changes in the lengths of three principal semiaxes) and to nonsynchronous rotation (longitudinal reorientation of two of the principal semiaxes). An excellent orthogonal fit to the lineaments is achieved by the stresses due to nonsynchronous rotation with the axis radial to Jupiter located 25?? east of its present position. This fit suggests that nonsynchronous rotation occurred at some time in Europa's history. ?? 1986 Nature Publishing Group.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Nature","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1038/321049a0","issn":"00280836","usgsCitation":"McEwen, A.S., 1986, Tidal reorientation and the fracturing of Jupiter's moon Europa: Nature, v. 321, no. 6065, p. 49-51, https://doi.org/10.1038/321049a0.","startPage":"49","endPage":"51","numberOfPages":"3","costCenters":[],"links":[{"id":205661,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1038/321049a0"},{"id":225854,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"321","issue":"6065","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb378e4b08c986b325dde","contributors":{"authors":[{"text":"McEwen, A. S.","contributorId":11317,"corporation":false,"usgs":true,"family":"McEwen","given":"A.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":369476,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014858,"text":"70014858 - 1986 - Danburite in evaporites of the Paradox basin, Utah.","interactions":[],"lastModifiedDate":"2024-05-21T11:09:12.65241","indexId":"70014858","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2450,"text":"Journal of Sedimentary Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Danburite in evaporites of the Paradox basin, Utah.","docAbstract":"Danburite (CaB 2 Si 2 O 8 ) has been found as nodules in Pennsylvanian age marine evaporites of the Paradox basin, Utah. Originally danburite had been known as a high-temperature mineral that occurs at numerous localities in igneous and metamorphic rocks. Since its discovery in water-insoluble residues from a Louisiana salt dome in 1937, it has been found in several other evaporites. The occurrence of danburite and its relation to the host rock in the Paradox basin evaporites indicates that it most likely formed by diagenetic reaction of boron-rich, high-salinity brines with constituents in the anhydrite host rock.
The 5-22 mu m size accounted for 40-50% of annual production in each embayment, but production by phytoplanton >22 mu m ranged from 26% in the S reach to 54% of total phytoplankton production in the landward embayment of the N reach. A productivity index is derived that predicts daily productivity for each size class as a function of ambient irradiance and integrated chlorophyll a in the photic zone. For the whole phytoplankton community and for each size class, this index was constant at approx= 0.76 g C m-2 (g chlorophyll a Einstein)-1. The annual means of maximum carbon assimilation numbers were usually similar for the three size classes. Spatial and temporal variations in size-fractionated productivity are primarily due to differences in biomass rather than size-dependent carbon assimilation rates. -from Authors
","language":"English","publisher":"Springer","doi":"10.2307/1351944","issn":"01608347","usgsCitation":"Cole, B., Cloern, J., and Alpine, A., 1986, Biomass and productivity of three phytoplankton size classes in San Francisco Bay: Estuaries, v. 9, no. 2, p. 117-126, https://doi.org/10.2307/1351944.","productDescription":"10 p.","startPage":"117","endPage":"126","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true},{"id":552,"text":"San Francisco Bay-Delta","active":false,"usgs":true},{"id":5079,"text":"Pacific Regional Director's Office","active":true,"usgs":true}],"links":[{"id":225732,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"9","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f18be4b0c8380cd4acbd","contributors":{"authors":[{"text":"Cole, B.E.","contributorId":66268,"corporation":false,"usgs":true,"family":"Cole","given":"B.E.","email":"","affiliations":[],"preferred":false,"id":369458,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cloern, J. E.","contributorId":59453,"corporation":false,"usgs":true,"family":"Cloern","given":"J. E.","affiliations":[],"preferred":false,"id":369457,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Alpine, A.E.","contributorId":6063,"corporation":false,"usgs":true,"family":"Alpine","given":"A.E.","affiliations":[],"preferred":false,"id":369456,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70015554,"text":"70015554 - 1986 - Oxygen isotope compositions of selected laramide-tertiary granitoid stocks in the Colorado Mineral Belt and their bearing on the origin of climax-type granite-molybdenum systems","interactions":[],"lastModifiedDate":"2012-03-12T17:18:56","indexId":"70015554","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1336,"text":"Contributions to Mineralogy and Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Oxygen isotope compositions of selected laramide-tertiary granitoid stocks in the Colorado Mineral Belt and their bearing on the origin of climax-type granite-molybdenum systems","docAbstract":"Quartz phenocrysts from 31 granitoid stocks in the Colorado Mineral Belt yield ??18O values less than 10.4???, with most values between 9.3 and 10.4???. An average magmatic value of about 8.5??? is suggested. The stocks resemble A-type granites; these data support magma genesis by partial melting of previously depleted, fluorine-enriched, lower crustal granulites, followed by extreme differentiation and volatile evolution in the upper crust. Subsolidus interaction of isotopically light water with stocks has reduced most feldspar and whole rock ??18O values. Unaltered samples from Climax-type molybdenumbearing granites, however, show no greater isotopic disturbance than samples from unmineralized stocks. Although meteoric water certainly played a role in post-mineralization alteration, particularly in feldspars, it is not required during high-temperature mineralization processes. We suggest that slightly low ??18O values in some vein and replacement minerals associated with molybdenum mineralization may have resulted from equilibration with isotopically light magmatic water and/or heavy isotope depletion of the ore fluid by precipitation of earlier phases. Accumulation of sufficient quantities of isotopically light magmatic water to produce measured depletions of 18O requires extreme chemical stratification in a large magma reservoir. Upward migration of a highly fractionated, volatile-rich magma into a small apical Climax-type diapir, including large scale transport of silica, alkalis, molybdenum, and other vapor soluble elements, may occur with depression of the solidus temperature and reduction of magma viscosity by fluorine. Climax-type granites may provide examples of 18O depletion in magmatic systems without meteoric water influx. ?? 1986 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Contributions to Mineralogy and Petrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Springer-Verlag","doi":"10.1007/BF00389393","issn":"00107999","usgsCitation":"Hannah, J.L., and Stein, H.J., 1986, Oxygen isotope compositions of selected laramide-tertiary granitoid stocks in the Colorado Mineral Belt and their bearing on the origin of climax-type granite-molybdenum systems: Contributions to Mineralogy and Petrology, v. 93, no. 3, p. 347-358, https://doi.org/10.1007/BF00389393.","startPage":"347","endPage":"358","numberOfPages":"12","costCenters":[],"links":[{"id":205463,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00389393"},{"id":224265,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"93","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a728fe4b0c8380cd76b8f","contributors":{"authors":[{"text":"Hannah, J. L.","contributorId":91993,"corporation":false,"usgs":true,"family":"Hannah","given":"J.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":371215,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stein, H. J.","contributorId":98748,"corporation":false,"usgs":true,"family":"Stein","given":"H.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":371216,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014844,"text":"70014844 - 1986 - Borehole field calibration and measurement of low-concentration manganese by decay gamma rays","interactions":[],"lastModifiedDate":"2024-04-18T15:59:49.859181","indexId":"70014844","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1808,"text":"Geophysics","active":true,"publicationSubtype":{"id":10}},"title":"Borehole field calibration and measurement of low-concentration manganese by decay gamma rays","docAbstract":"The manganese concentration in the Arundel clay formation, Prince Georges County, Maryland, was determined from a borehole by using delayed neutron activation. The neutrons were produced by a 100 mu g 252 Cf source. The 847 keV gamma ray of manganese was detected continuously, and its counting rate was measured at intervals of 15 s as the measuring sonde was moved at a rate of 0.5 cm/s. The technique measured the concentration ratio of manganese to aluminum. This ratio, when combined with an estimate of the aluminum concentration of the clay, made it possible to determine the percentage concentration of manganese without using a test-pit calibration facility. The measurements were made by using an NaI(Tl) scintillation detector and a Ge(HP) solid-state detector cooled by solid propane. A two-pass technique had to be used with the scintillation detector because Compton background from the 1 779 keV photopeak of aluminum masked the manganese line. The Compton background did not interfere when the solid-state detector was used. The borehole measurements compared favorably with a chemical core analysis and were unaffected by water in the borehole.
","language":"English","publisher":"Society of Exploration Geophysicists","doi":"10.1190/1.1442075","issn":"00168033","usgsCitation":"Mikesell, J., Senftle, F.E., Lloyd, T., Tanner, A., Merritt, C., and Force, E.R., 1986, Borehole field calibration and measurement of low-concentration manganese by decay gamma rays: Geophysics, v. 51, no. 12, p. 2219-2224, https://doi.org/10.1190/1.1442075.","productDescription":"6 p.","startPage":"2219","endPage":"2224","numberOfPages":"6","costCenters":[],"links":[{"id":225600,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"51","issue":"12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f217e4b0c8380cd4afd5","contributors":{"authors":[{"text":"Mikesell, J.L.","contributorId":46113,"corporation":false,"usgs":true,"family":"Mikesell","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":369428,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Senftle, F. E.","contributorId":47788,"corporation":false,"usgs":true,"family":"Senftle","given":"F.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":369429,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lloyd, T.A.","contributorId":6600,"corporation":false,"usgs":true,"family":"Lloyd","given":"T.A.","email":"","affiliations":[],"preferred":false,"id":369425,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Tanner, A.B.","contributorId":44155,"corporation":false,"usgs":true,"family":"Tanner","given":"A.B.","email":"","affiliations":[],"preferred":false,"id":369427,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Merritt, C.T.","contributorId":63966,"corporation":false,"usgs":true,"family":"Merritt","given":"C.T.","email":"","affiliations":[],"preferred":false,"id":369430,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Force, E. R.","contributorId":28235,"corporation":false,"usgs":true,"family":"Force","given":"E.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":369426,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70015677,"text":"70015677 - 1986 - Deformation of poorly consolidated sediment during shallow emplacement of a basalt sill, Coso Range, California","interactions":[],"lastModifiedDate":"2018-10-24T15:41:24","indexId":"70015677","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1109,"text":"Bulletin of Volcanology","active":true,"publicationSubtype":{"id":10}},"title":"Deformation of poorly consolidated sediment during shallow emplacement of a basalt sill, Coso Range, California","docAbstract":"A 150-m-long, wedge-shaped unit of folded and faulted marly siltstone crops out between undeformed sedimentary rocks on the north flank of the Coso Range, California. The several-meter-thick blunt end of this wedge abuts the north margin of a basaltic sill of comparable thickness. Chaotically deformed siltstone crops out locally at the margin of this sill, and at one locality breccia pipes about one meter in diameter crosscut the sill. The sill extends about 1 km south up the paleoslope, where it merges through continuous outcrop with a lava flow that in turn extends 1.4 km to a vent area marked by more than 100 m of agglutinate and scoria. Apparently, lava extruded at this vent flowed onto unconsolidated sediments, burrowed into them, and fed a sill at about 40 m depth within the sedimentary sequence. The sill initially propagated by wedging between sedimentary beds, but eventually began to push some beds ahead of itself, forming a remarkable train of folds in the process. The sediments apparently were wet at the time of sill emplacement, because hydrothermal alteration is common near the contact between the two rock types and because the breccia pipes that crosscut the sill apparently resulted from phreatic explosions of pore water heated at the base of the cooling sill. Comparison of deformation of the host material at the Coso locality with that reportedly caused by emplacement of sills elsewhere indicates that the character of deformation differs greatly among the various localities. The specific response of host material depends upon such parameters as initial properties of magma and host material, rate of sill growth and attendant rate of strain of host material, and depth of sill emplacement. Some properties may change considerably during an intrusive-deformational episode, thus complicating accurate reconstruction of such an event.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Bulletin of Volcanology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Springer-Verlag","doi":"10.1007/BF01046545","issn":"02588900","usgsCitation":"Duffield, W.A., Bacon, C., and Delaney, P., 1986, Deformation of poorly consolidated sediment during shallow emplacement of a basalt sill, Coso Range, California: Bulletin of Volcanology, v. 48, no. 2-3, p. 97-107, https://doi.org/10.1007/BF01046545.","productDescription":"11 p.","startPage":"97","endPage":"107","numberOfPages":"11","costCenters":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":223731,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":205408,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF01046545"}],"volume":"48","issue":"2-3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fe49e4b0c8380cd4ec43","contributors":{"authors":[{"text":"Duffield, W. A.","contributorId":71935,"corporation":false,"usgs":true,"family":"Duffield","given":"W.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":371502,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bacon, C. R. 0000-0002-2165-5618","orcid":"https://orcid.org/0000-0002-2165-5618","contributorId":21522,"corporation":false,"usgs":true,"family":"Bacon","given":"C. R.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":false,"id":371500,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Delaney, P.T.","contributorId":69980,"corporation":false,"usgs":true,"family":"Delaney","given":"P.T.","email":"","affiliations":[],"preferred":false,"id":371501,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014707,"text":"70014707 - 1986 - Crater Lake, Oregon: A restricted basin with base-of-slope aprons of nonchannelized turbidites","interactions":[],"lastModifiedDate":"2024-01-26T12:12:16.016992","indexId":"70014707","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Crater Lake, Oregon: A restricted basin with base-of-slope aprons of nonchannelized turbidites","docAbstract":"The basin floor of Crater Lake (10-km diameter, 600-m water depth) is covered by up to 75 m of sediment–gravity-flow deposits interbedded with mud. In the upper units (8 m (thick), sand and gravel layers with numerous wedging, strong seismic reflectors characterize the base-of-slope aprons at the basin margin. These layers evolve to turbidites of mainly thin, fine-grained, basin-plain type, characterized by numerous flat and weak seismic reflectors in the central basin floor. Many individual debris-chute sources funnel sediment to base-of-slope aprons: there, coarse-grained parts of the sediment–gravity flows deposit nonchannelized beds attributed to the F, A, B turbidite facies. While traversing the base-of-slope aprons, flows evolve to sheet-flow turbidity currents that deposit D-facies beds over the central basin floor. These processes and patterns of deposition characterize small siliciclastic basins without channelized submarine fans and are common in carbonate basins of all sizes.
No abstract available.
","language":"English","publisher":"American Chemical Society","doi":"10.1021/es00144a007","issn":"0013936X","usgsCitation":"Horowltz, A., 1986, Comparison of methods for the concentration of suspended sediment in river water for subsequent chemical analysis: Environmental Science & Technology, v. 20, no. 2, p. 155-160, https://doi.org/10.1021/es00144a007.","productDescription":"6 p.","startPage":"155","endPage":"160","costCenters":[],"links":[{"id":225589,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"2","noUsgsAuthors":false,"publicationDate":"2002-05-01","publicationStatus":"PW","scienceBaseUri":"5059f875e4b0c8380cd4d100","contributors":{"authors":[{"text":"Horowltz, A.J.","contributorId":98472,"corporation":false,"usgs":true,"family":"Horowltz","given":"A.J.","email":"","affiliations":[],"preferred":false,"id":368911,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014647,"text":"70014647 - 1986 - A fan dam for Tulare Lake, California, and implications for the Wisconsin glacial history of the Sierra Nevada","interactions":[],"lastModifiedDate":"2023-12-28T12:15:35.819846","indexId":"70014647","displayToPublicDate":"1986-01-01T00:00:00","publicationYear":"1986","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"A fan dam for Tulare Lake, California, and implications for the Wisconsin glacial history of the Sierra Nevada","docAbstract":"Historic fluctuations and late Quaternary deposits of Tulare Lake, in the southern San Joaquin Valley, indicate that maximum lake size has depended chiefly on the height of a frequently overtopped spillway. This dependence gives Tulare Lake a double record of paleoclimate. Climate in the Tulare Lake region has influenced the degree to which the lake fills its basin during dry seasons and dry years: during the past 100,000–130,000 yr, incidence of desiccation of Tulare Lake (inferred from stiffness, mud cracks, and other hand-specimen properties) has been broadly consistent with the lake's salinity and depth (inferred from diatoms and ostracodes) and with regional vegetation (inferred from pollen). Climate, however, also appears to control basin capacity itself: Tulare Lake becomes large as a consequence of glacial-outwash aggradation of its alluvial-fan dam.
Late Wisconsin enlargement of Tulare Lake probably resulted from the last major glaciation of the Sierra Nevada. The lake's spillway coincides with the axis of the glacial-outwash fan of a major Sierra Nevada stream; moreover, sediment deposited in the transgressive lake resembles glacial rock flour from the Sierra Nevada. Differential tectonic subsidence and deposition by a Coast Range creek facilitated the building of Tulare Lake's fan dam during the late Wisconsin but were less important than deposition of Sierra Nevada outwash. Four stratigraphically consistent 14C dates on peat and wood give an age of 26,000 yr B.P. for the start of Tulare Lake's late Wisconsin transgression. The last major Sierra Nevada glaciation (Tioga glaciation) thus may have begun about 26,000 yr B.P., provided that vigorous glacial-outwash deposition began early in the glaciation. Onset of the Tioga glaciation about 26,000 yr B.P. is consistent with new stratigraphic and radiocarbon data from the northeastern San Joaquin Valley. These data suggest that the principal episode of glacial-outwash deposition of Wisconsin age began in the San Joaquin Valley after 32,000 yr B.P., rather than at least 40,000 yr B.P., as previously believed.
An earlier enlargement of Tulare Lake probably resulted from a fan dam produced by the penultimate major (Tahoe) glaciation of the Sierra Nevada. Average sedimentation rates inferred from depths to a 600,000-yr-old clay and from radiocarbon dates indicate that this earlier lake originated no later than 100,000 yr B.P. The Tahoe glaciation therefore is probably pre-Wisconsin.
No abstract available.
","language":"English","publisher":"American Chemical Society","doi":"10.1021/es00150a012","issn":"0013936X","usgsCitation":"Friedman, L., Schroder, L., and Brooks, M., 1986, Recovery of several volatile organic compounds from simulated water samples: Effect of transport and storage: Environmental Science & Technology, v. 20, no. 8, p. 826-829, https://doi.org/10.1021/es00150a012.","productDescription":"4 p.","startPage":"826","endPage":"829","costCenters":[],"links":[{"id":226236,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"8","noUsgsAuthors":false,"publicationDate":"2002-05-01","publicationStatus":"PW","scienceBaseUri":"50e4a33ce4b0e8fec6cdb7d2","contributors":{"authors":[{"text":"Friedman, L.C.","contributorId":57080,"corporation":false,"usgs":true,"family":"Friedman","given":"L.C.","email":"","affiliations":[],"preferred":false,"id":368855,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schroder, L.J.","contributorId":31767,"corporation":false,"usgs":true,"family":"Schroder","given":"L.J.","email":"","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":368854,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Brooks, M.G.","contributorId":103410,"corporation":false,"usgs":true,"family":"Brooks","given":"M.G.","email":"","affiliations":[],"preferred":false,"id":368856,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ]}