Composition of the earth's upper mantle-I. Siderophile trace elements in ultramafic nodules
J. W. Morgan, G.A. Wandless, R.K. Petrie, A.J. Irving
1981, Tectonophysics (75) 47-67
Seven siderophile elements (Au, Ge, Ir, Ni, Pd, Os, Re) were determined by radiochemical neutron activation analysis in 19 ultramafic rocks, which are spinel lherzollites-xenoliths from North and Central America, Hawaii and Australia, and garnet Iherzolitexenoliths from Lesotho.Abundances of the platinum metals are very uniform in spinel lherzolites averaging 3.4...
A process-sedimentary framework for characterizing recent and ancient sabkhas
C.R. Handford
1981, Sedimentary Geology (30) 255-265
The discovery of sabkha environments during the 1960's, marked the beginning of Recent evaporite sedimentological studies and their perception as models for facies analysis. However, variation among Recent sabkhas, though recognized by the geologic community, has not been duly addressed, which has resulted in overuse of the Trucial Coast model...
Lower Eocene alluvial paleosols (Willwood Formation, Northwest Wyoming, U.S.A.) and their significance for paleoecology, paleoclimatology, and basin analysis
T. M. Bown, M. J. Kraus
1981, Palaeogeography, Palaeoclimatology, Palaeoecology (34) 1-30
The lower Eocene Willwood Formation of northwest Wyoming is a 700 m thick accumulation of alluvial floodplain and channel mudstones and sandstones, nearly all of which show paleopedogenic modifications. Pedogenesis of Willwood sandstones is indicated by taproot and vertebrate and invertebrate bioturbation, early local cementation by calcium carbonate, and thin...
Tonalites in crustal evolution
F. Barker, Joseph G. Arth, T. Hudson
1981, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (301) 293-303
Tonalites, including trondhjemite as a variety, played three roles through geological time in the generation of Earth’s crust. Before about 2.9 Ga ago they were produced largely by simple partial melting of metabasalt to give the dominant part of Archaean grey gneiss terranes. These terranes are notably bimodal; andesitic rocks...
Waterfowl and their wintering grounds in Mexico, 1937-64
George B. Saunders, Dorothy Chapman Saunders
1981, Resource Publication 138
The U.S. Fish and Wildlife Service has been interested in migratory birds, especially waterfowl, in Mexico for many years, An early period of cooperation in waterfowl administration was culminated in 1937 with the final ratification of the Convention Between the United States and the United Mexican States for the Protection...
Seismic-reflection and sidescan-sonar data collected off eastern Cape Cod, Massachusetts, during April 1979
Harley J. Knebel
1981, Open-File Report 81-184
The U.S. Geological Survey collected 98 line kilometers of single-channel seismic-reflection profiles and sidescan sonar records on the inner shelf of eastern Cape Cod, Massachusetts, during April 1979. The data were obtained during cruise NE-1-79 of the R/V NEECHO. The purposes of the survey were: (1) to study the development...
Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic Allochthon, southwestern Massachusetts and adjacent Connecticut and New York
E-an Zen
1981, Professional Paper 1113
The mineral assemblages from metamorphosed slightly calcic pelitic rocks of the Taconic Range in southwestern Massachusetts and adjacent areas of Connecticut and New York were studied petrographically and chemically. These rocks vary in metamorphic grade from those below the chloritoid zone through the chloritoid and garnet zones into the kyanite-staurolite...
Hydraulic characteristics of an underdrained irrigation circle, Muskegon County, wastewater disposal system, Michigan
M.G. McDonald
1981, Water Supply Paper 2081
Muskegon County, Michigan, disposes of waste water by spray irrigating farmland on its waste-disposal site. Buried drains in the highly permeable unconfined aquifer at the site control the level of the water table. Hydraulic conductivity of the aquifer and drain-leakance, the reciprocal of resistance to flow into the drains, was...
A manual of modified analytical procedures for conventional rock analysis
Herbert Kirschenbaum
1981, Open-File Report 81-359
This manual was written to establish the most accurate analytical methodology for determining the major constituents in silicate rocks. This report describes modified classical procedures for determining the amount of SiO2, Al2O3, Fe2O3, FeO, CaO, MgO, H2O-, H2O+, TiO2, P2O5, MnO, CO2, and S in silicate rocks. In the determination...
Map showing aeromagnetic interpretation of the Baker-Cypress BLM Instant Study Area and Timbered Crater Forest Service Further Planning Areas, Modoc, Shasta, and Siskiyou counties, California
Andrew Griscom
1981, Miscellaneous Field Studies Map 1214-C
The data for the aeromagnetic map of the Baker-Cypress and Timbered crater areas were collected in 1978 and compiled at a scale of 1 :62,500 (U,S, Geological Survey, 1979). East-west traverses were spaced at 0.8-km intervals at a constant altitude of 1370 m (4500 ft) above sea level, Contour interval...
Map showing geothermal resources of the Lake City-Surprise Valley Known Geothermal Resource Area, Modoc County, California
1981, Miscellaneous Field Studies Map 1299
This report summarizes geothermal data from published and unpublished geophysical, geochemical, and geologic reports on Surprise Valley that have been prepared during the past 26 years. Particular emphasis is placed on a comprehensive structural interpretation of the west half of the valley that is based on map compilation of concealed...
Modification of the Tangborn short-term hydrometeorological model, with trial results from the Baker River basin, Washington
M.R. Karlinger, J. D. Wilson
1981, Open-File Report 81-694
This report presents a modification of the short-term hydrometeorological model (Tangborn, 1978) for estimating river-basin snowmelt runoff. A multiple linear regression replaces a nonlinear regression scheme to correct for temperature effects of snowmelt runoff. Results based on data from the Baker River basin, Washington, indicate that model performance is improved...
Sediment transport and effective discharge of the North Platte, South Platte, and Platte Rivers in Nebraska
J. E. Kircher
1981, Open-File Report 81-53
Sediment discharge was computed for four locations along the North Platte, South Platte, and the Platte Rivers between North Platte and Grand Island, Nebraska in order to determine the effective discharge. The total-sediment discharge was computed by the Colby method and modified Einstein method so that comparisons could be made...
One-dimensional reservoir-lake temperature and dissolved oxygen model
Leo B. House
1981, Water-Resources Investigations Report 82-5
This report describes and documents a one-dimensional computer model that predicts dissolved-oxygen and temperature profiles in a lake or reservoir. Downstream release dissolved-oxygen concentrations and temperatures also are computed based on a user-specified outflow withdrawal elevation. The model can, therefore, be used to compare top-draw versus bottom-draw outlet configuration effects...
Facies characteristics and patterns in modern size-graded shelf deposits, northwestern Gulf of Mexico
Gary W. Hill
1981, Open-File Report 81-102
Mineral resource potential of the Baker-Cypress BLM Instant Study Area and Timbered Crater Forest Service Further Planning (RARE II) Areas, Modoc, Shasta, and Siskiyou Counties, California
Jocelyn A. Peterson, L.M. Martin, L. E. Esparza, Gary J. Cwick
1981, Miscellaneous Field Studies Map 1214-B
In accordance with the provisions of the Federal Land Policy and Management Act (Public Law 94-579, October 21, 1976), the Geological Survey and the Bureau of Mines have conducted mineral surveys on certain areas, which formally had been identified as "natural" and "primitive" areas prior to November 1, 1975.The Wilderness...
Deepwell monitoring of strain-sensitive parameters over the greater Southern California uplift
Thomas L. Henyey, Ta-liang Teng, Douglas E. Hammond, C.G. Sammis
1981, Open-File Report 81-881
Several wells and springs near active faults in southern California have been monitored for the concentration of Rn, Na+ , K+ , Mg+2 , and Cl- for periods of up to 24 months, in an effort to see if any of these constituents show variations which may be related to...
Comparison of the propane-area tracer method and predictive equations for determination of stream-reaeration coefficients on two small streams in Wisconsin
Leo B. House, Steven Skavroneck
1981, Water-Resources Investigations Report 80-105
This study was made to identify the best predictive equations for a stream's reaeration-rate coefficient. Reaeration-rate information is needed in dissolvedoxygen modeling work, but an actual tracer measurement is not always possible. The propane-area gas-tracer method and predictive equations were compared for determination of stream-reaeration coefficients (K.2) for reaches of two...
Two-dimensional ground-water flow model of the Cretaceous aquifer system of Lee County and vicinity, Mississippi
John Michael Kernodle
1981, Water-Resources Investigations Report 81-70
A two-dimensional ground-water flow model of the Eutaw-McShan and Gordo aquifers in the area of Lee County, Miss., was successfully calibrated and verified using data from six long-term observation wells and two intensive studies of areal water levels. The water levels computed by the model were found to be most...
Modeling the cumulative onshore effects of offshore oil and gas development
E.T. Smith, L.G. Hecht
1981, Open-File Report 81-317
Proceedings of the Symposium on Mineral Deposits of the Pacific Northwest: Geological Society of America, Cordilleran Section meeting at Corvallis, Oregon, March 20-21, 1980
Miles L. Silberman, C. W. Field, Anne L. Berry
1981, Open-File Report 81-355
Stratiform and volcanogenic zinc-lead-barium deposits occur within the pelagic Kagvik sequence in the Red Dog Creek and Drenchwater Creek areas in the DeLong Mountains and Howard Pass quadrangles. The sulfide deposits occur together with barite, tuff, sandstone, shale, chert, and keratophyre flows and sills. The three main occurrences of the...
A TI-59 calculator program for computation of Schlumberger resistivity sounding curves for models with as many as 25 horizontal layers
Ahmed Samir M. El Kahwagy
1981, Open-File Report 81-160
Documentation and user's guide to the USGS oilspill risk analysis model: oilspill trajectories and calculation of conditional probabilities
Kenneth J. Lanfear, William B. Samuels
1981, Open-File Report 81-316
Hydrogeologic conditions in the coastal plain of New Jersey
Eric F. Vowinkel, W. Kendall Foster
1981, Open-File Report 81-405
A wedge-shaped mass of unconsolidated sediments composed of alternating layers of clay, silt, sand, and gravel underlies the Coastal Plain of New Jersey. The hydrologic units of this mass vary in thickness, lateral extent, lithology, and water-bearing characteristics. Some of the units act as aquifers, whereas other units act as...
Documentation of a dissolved-solids model of the Tongue River, southeastern Montana
Paul F. Woods
1981, Open-File Report 81-479
A model has been developed for assessing potential increases in dissolved solids of the Tongue River as a result of leaching of overburden materials used to backfill pits in surface coal-mining operations. The model allows spatial and temporal simulation of streamflow and dissolved-solids loads and concentrations under user-defined scenarios of...
