Distribution and ecology of deep-water benthic foraminifera in the Gulf of Mexico
C. W. Poag
1984, Palaeogeography, Palaeoclimatology, Palaeoecology (48) 25-37
Bathyal and abyssal foraminifera in the Gulf of Mexico are distributed among thirteen generic predominance facies. Five predominance facies nearly encircle the Gulf basin along the slope and rise; a sixth predominance facies blankets the Sigsbee Plain, and a seventh is restricted to the Mississippi Fan. The remaining eight predominance...
Neogene stratigraphy of the submerged U.S. Atlantic margin
C. Wylie Poag
1984, Palaeogeography, Palaeoclimatology, Palaeoecology (47) 103-127
Thirty boreholes and several hundred sea-floor samples provide a detailed but incomplete record of Neogene strata and depositional environments along the submerged part of the United States Atlantic margin. Three major sedimentary basins, the Blake Plateau Basin, the Baltimore Canyon Trough, and the Georges Bank Basin, contain Neogene sedimentary prisms...
Unzipping of the volcano arc, Japan
R. J. Stern, N. C. Smoot, M. Rubin
1984, Tectonophysics (102) 153-174
A working hypothesis for the recent evolution of the southern Volcano Arc, Japan, is presented which calls upon a northward-progressing sundering of the arc in response to a northward-propagating back-arc basin extensional regime. This model appears to explain several localized and recent changes in the tectonic and magrnatic evolution...
Geochemical investigation of Archaean Bimodal and Dwalile metamorphic suites, Ancient Gneiss Complex, Swaziland
D.R. Hunter, F. Barker, Hugh T. Millard Jr.
1984, Precambrian Research (24) 131-155
The bimodal suite (BMS) comprises leucotonalitic and trondhjemitic gneisses interlayered with amphibolites. Based on geochemical parameters three main groups of siliceous gneiss are recognized: (i) SiO2 < 73%, Al2O3 > 14%, and fractionated light rare-earth element (REE) and flat heavy REE patterns; (ii) SiO2 and Al2O3 contents similar to (i) but with strongly fractionated...
A note on drillhole depths required for reliable heat flow determinations
David S. Chapman, Jack Howell, John H. Sass
1984, Tectonophysics (103) 11-18
In general, there is a limiting depth in a drillhole above which the reliability of a single determination of heat flow decreases rapidly with decreasing depth and below which the statistical uncertainty of a heat flow determination does not change perceptibly with increasing depth. This feature has been established empirically...
Depositional environments and paleogeography of the Upper Miocene Wassuk Group, west-central Nevada
R.T. Golia, John H. Stewart
1984, Sedimentary Geology (38) 159-180
Fluvial and lacustrine deposits of the Miocene Wassuk Group, exposed in Coal Valley, west-central Nevada, are divided into five lithofacies: (1) diatomite, claystone, siltstone, and carbonaceous siltstone deposited in a lake with paludal conditions at the margin; (2) upward-coarsening sequences of sandstone deposited on a delta and fan-delta; (3) channel-form...
Oligocene tectonics and sedimentation, California
Tor H. Nilsen
1984, Sedimentary Geology (38) 305-336
During the Oligocene epoch, California was marked by extensive nonmarine sedimentation, in contrast to its pre-Oligocene and post-Oligocene depositional history. The Oligocene continental deposits are especially widespread in southern California and fill a number of small and generally partly restricted basins. Fluvial facies in many basins prograded over previously deposited...
Fluvial sedimentation on a quivering craton: Influence of slight crustal movements on fluvial processes, upper Jurassic Morrison formation, western Colorado Plateau
Fred Peterson
1984, Sedimentary Geology (38) 21-49
One of the most important challenges facing the fluvial sedimentologist is identification of processes outside the stream channel that influence deposition of fluvial sediments. Detailed studies in the lower sequence of the Salt Wash Member (Morrison Formation, Upper Jurassic) demonstrate that crustal deformation at the site of deposition may considerably...
A review of crust and upper mantle structure studies of the Snake River Plain-Yellowstone volcanic system: A major lithospheric anomaly in the western U.S.A.
H. M. Iyer
1984, Tectonophysics (105) 291-308
The Snake River Plain-Yellowstone volcanic system is one of the largest, basaltic, volcanic field in the world. Here, there is clear evidence for northeasterly progression of rhyolitic volcanism with its present position in Yellowstone. Many theories have been advanced for the origin of the Snake River Plain-Yellowstone system. Yellowstone and...
Crustal structure of the Appalachian Highlands in Tennessee
C. Prodehl, J. Schlittenhardt, S.W. Stewart
1984, Tectonophysics (109) 61-76
Crustal structure of the southern Appalachians and adjacent Interior Low Plateaus in Tennessee is derived from seismic-refraction measurements observed by the U.S. Geological Survey in 1965 along reversed lines, normal (NW-SE) and parallel (NE-SW) to the structure of the Appalachian Highlands' major geologic divisions. Its easternmost part is located approximately...
A seismic hazard map of India and adjacent areas
K.N. Khattri, A. M. Rogers, D. M. Perkins, S. T. Algermissen
1984, Tectonophysics (108) 93-134
We have produced a probabilistic seismic hazard map showing peak ground accelerations in rock for India and neighboring areas having a 10% probability of being exceeded in 50 years. Seismogenic zones were identified on the basis of historical seismicity, seismotectonics and geology of the region. Procedures for reducing the incompleteness...
Chronology of late Wisconsinan glaciation in middle North America
L. Clayton, S.R. Moran
1984, Quaternary Science Reviews (1) 55-82
We propose a chronology of late Wisconsinan glacial fluctuations in middle North America, from Alberta to Wisconsin, based on radiocarbon dates derived solely from wood. Previous chronologies of the southwestern margin of the North American Continental Ice Sheet have depended to a considerable degree on radiocarbon dates from fine-grained organic...
Use of a digital model to evaluate hydrogeologic controls on groundwater flow in a fractured rock aquifer at Niagara Falls, New York, U.S.A.
M.L. Maslia, R.H. Johnston
1984, Journal of Hydrology (75) 167-194
The Hyde Park landfill is a 15-acre (6.1 ha) chemical waste disposal site located north of Niagara Falls, New York. Underlying the site in descending order are: (1) low-permeability glacial till and lacustrine deposits; (2) a moderately permeable fractured rock aquifer - the Lockport Dolomite; and (3) a low-permeability unit...
Groundwater-flow parameter estimation and quality modeling of the Equus Beds aquifer in Kansas, U.S.A.
M.A. Sophocleous
1984, Journal of Hydrology (69) 197-222
The salinity problems created in the Burrton area as a result of poor oil-field brine disposal practices of the past continue to be a major concern to the area depending on the Equus Beds aquifer for water, including the City of Wichita, Kansas. In this paper, an attempt is made...
Transport and concentration controls for chloride, strontium, potassium and lead in Uvas Creek, a small cobble-bed stream in Santa Clara County, California, U.S.A.: 1. Conceptual model
V. C. Kennedy, A. P. Jackman, S.M. Zand, G. W. Zellweger, R.J. Avanzino
1984, Journal of Hydrology (75) 67-110
Stream sediments adsorb certain solutes from streams, thereby significantly changing the solute composition; but little is known about the details and rates of these adsorptive processes. To investigate such processes, a 24-hr. injection of a solution containing chloride, strontium, potassium, sodium and lead was made at the head of a...
Transport and concentration controls for chloride, strontium, potassium and lead in Uvas Creek, a small cobble-bed stream in Santa Clara County, California, U.S.A.: 2. Mathematical modeling
A. P. Jackman, R. A. Walters, V. C. Kennedy
1984, Journal of Hydrology (75) 111-141
Three models describing solute transport of conservative ion species and another describing transport of species which adsorb linearly and reversibly on bed sediments are developed and tested. The conservative models are based on three different conceptual models of the transient storage of solute in the bed. One model assumes the...
Experimental studies in natural groundwater recharge dynamics: Assessment of recent advances in instrumentation
M. Sophocleous, C. A. Perry
1984, Journal of Hydrology (70) 369-382
To quantify and model the natural groundwater-recharge process, two sites in south-central Kansas, U.S.A., were instrumented with various modern sensors and data microloggers. The atmospheric-boundary layer and the unsaturated and saturated soil zones were monitored as a unified regime. Data from the various sensors were collected using microloggers in combination...
Determination of total tin in geological materials by electrothermal atomic-absorption spectrophotometry using a tungsten-impregnated graphite furnace
L. Zhou, T. T. Chao, A. L. Meier
1984, Talanta (31) 73-76
An electrothermal atomic-absorption spectrophotometric method is described for the determination of total tin in geological materials, with use of a tungsten-impregnated graphite furnace. The sample is decomposed by fusion with lithium metaborate and the melt is dissolved in 10% hydrochloric acid. Tin is then extracted into trioctylphosphine oxide-methyl isobutyl ketone...
Streamflow and basin characteristics at selected sites in Kentucky
N.B. Melcher, K.J. Ruhl
1984, Open-File Report 84-704
Common basin and streamflow characteristics for sites in Kentucky are presented. Basin characteristics include quantified drainage basin parameters and statistics on areal rainfall. Streamflow characteristics include tables for mean, high and low flow frequencies and partial duration discharge. The data listed in this report are for continuous and low-flow partial-record...
Maps showing distribution of pH, copper, zinc, fluoride, uranium, molybdenum, arsenic, and sulfate in water, Richfield 1° x 2° quadrangle, Utah
J. B. McHugh, W. R. Miller, W. H. Ficklin
1984, Miscellaneous Field Studies Map 1246-L
These maps show the regional distribution of copper, zinc, arsenic, molybdenum, uranium, fluoride, sulfate, and pH in surface and ground water from the Richfield 1° x 2° quadrangle. This study supplements (Miller and others, 1984a-j) the regional drainage geochemical study done for the Richfield quadrangle under the U.S. Geological Survey’s...
Digital line graphs from 1:24,000-scale maps
William R. Allder, Atef A. Elassal
1984, Circular 895-C
Digital line graph attribute coding standards
William R. Allder, A.J. Sziede, R.B. McEwen, F.J. Beck
1984, Circular 895-G
The Georges Bank monitoring program, 1984: Analysis of trace metals in bottom sediments during the second year of monitoring
Michael H. Bothner, R.R. Rendigs, Esma Campbell, M. W. Doughten, C.M. Parmenter, M. J. Pickering, R. G. Johnson, J.R. Gillison
1984, Circular 936
Of the 12 elements analyzed in bulk (undifferentiated) sediments collected adjacent to drilling rigs on Georges Bank, only barium was found to increase in concentration during the drilling period (July 1981 until September 1982). The maximum postdrilling concentration of barium (a major element in drilling mud) reached 172 ppm in...
Computer analysis of digital well logs
James H. Scott
1984, Circular 879
A comprehensive system of computer programs has been developed by the U.S. Geological Survey for analyzing digital well logs. The programs are operational on a minicomputer in a research well-logging truck, making it possible to analyze and replot the logs while at the field site. The minicomputer also serves as...
Earthquakes in the United States, July-September 1982
J. H. Minsch, C. W. Stover, L. R. Brewer, F. W. Baldwin
1984, Circular 896-C
No abstract available....
