Sr isotopic tracer study of the Samail ophiolite, Oman
M. A. Lanphere, R. G. Coleman, C.A. Hopson
1981, Journal of Geophysical Research Solid Earth (86) 2709-2720
We have measured Rb and Sr concentrations and Sr isotopic compositions in 41 whole-rock samples and 12 mineral separates from units of the Samail ophiolite, including peridotite, gabbro, plagiogranite, diabase dikes, and gabbro and websterite dikes within the metamorphic peridotite. Ten samples of cumulate gabbro from the Wadir Kadir section...
Simulation model of Skeletonema costatum population dynamics in northern San Francisco Bay, California
J. E. Cloern, R. T. Cheng
1981, Estuarine, Coastal and Shelf Science (12) 83-100
A pseudo-two-dimensional model is developed to simulate population dynamics of one dominant phytoplankton species (Skeletonema costatum) in northern San Francisco Bay. The model is formulated around a conceptualization of this estuary as two distinct but coupled subsystems—a deep (10–20 m)...
Status of population modeling of the River Mountain herd
David M. Leslie Jr., C. L. Douglas
1981, Book chapter, Desert Bighorn Council Transactions
No abstract available at this time...
Exsolution of Ca-clinopyroxene from orthopyroxene aided by deformation
S. H. Kirby, M.A. Etheridge
1981, Physics and Chemistry of Minerals (7) 105-109
Monoclinic calcium-poor shear-transformation lamellae and calcium-rich exsolution lamellae occur parallel to (100) in orthopyroxene. The formation of both structures from an orthopyroxene host involves a shear on (100) parallel to [001], with additional cation exchange in the exsolution case. The shear transformation involves a macroscopic simple shear angle of 13.3??...
Flow through fractures
C. E. Neuzil, James V. Tracy
1981, Water Resources Research (17) 191-199
Flow through fractures is often idealized as flow between two parallel plates (plane Poiseuille flow). The opening or aperture between parallel plates is unambiguous and its relation to flowrate is well known. However, fractures in rock have uneven walls and a variable aperture. A model for flow in a fracture...
Seawater sulfate reduction and sulfur isotope fractionation in basaltic systems: interaction of seawater with fayalite and magnetite at 200–350°C
Wayne C. Shanks III, James L. Bischoff, Robert J. Rosenbauer
1981, Geochimica et Cosmochimica Acta (45) 1977-1995
Sulfate reduction during seawater reaction with fayalite and with magnetite was rapid at 350°C, producing equilibrium assemblages of talc-pyrite-hematite-magnetite at low water/rock ratios and talc-pyrite-hematite-anhydrite at higher water/rock ratios. At 250°C, seawater reacting with fayalite produced detectable amounts of dissolved H2S, but extent of reaction of solid phases was...
Economics and coal resource appraisal: strippable coal in the Illinois Basin ( USA)
E. D. Attanasi, E.K. Green
1981, Southern Economic Journal (47) 742-752
Coal-resource appraisals generally describe the location and general characteristics of coal beds. Estimates are made of the average overburden depth (depth of the coal bed below the surface), bed thickness, and perhaps certain chemical properties of the coal [1]. Although such resource compilations represent an important initial step, neither they...
Correlation of natural gas content to iron species in the New Albany shale group
R.H. Shiley, R.M. Cluff, D. R. Dickerson, C.C. Hinckley, Gerard V. Smith, H. Twardowska, Mykola Saporoschenko
1981, Fuel (60) 732-738
Mössbauer parameters were obtained for four Illinois Basin shales and their corresponding < 2μm clay fractions from wells drilled through the New Albany Shale Group in Henderson, Tazewell, and Effingham counties in Illinois and Christian County in Kentucky. Off-gas analysis indicated that the Illinois cores were in an area of...
Chemical modifications accompanying blueschist facies metamorphism of Franciscan conglomerates, Diablo Range, California
Diane E. Moore, J. G. Liou, B.-S. King
1981, Chemical Geology (33) 237-263
As part of an investigation of blueschist-facies mineral parageneses in pebbles and matrix of some Franciscan metaconglomerates of the Diablo Range, California, textural and major-element chemical analyses were conducted on a number of igneous pebbles that comprise a range of rock types from granite and dacite to gabbro and basalt....
Aeromagnetic and radio echo ice-sounding measurements over the Dufek intrusion, Antarctica
John C. Behrendt, D.J. Drewry, E. Jankowski, M. S. Grim
1981, Journal of Geophysical Research Solid Earth (86) 3014-3020
A combined aeromagnetic and radio echo ice-sounding survey (4200 km of traverse) made in 1978 in Antarctica over the Dufek layered mafic intrusion of Jurassic age suggests a minimum area of about 50,000 km2, making it comparable in size with the Bushveld Complex of Africa. Comparisons of the magnetic and...
Electronic and optical modification of the engineering model FLD and the evolution of peripheral equipment
Robert D. Watson, Arnold F. Theisen
William R. Hemphill, Mark Settle, editor(s)
1981, Conference Paper, Workshop on applications of luminescence techniques to Earth resource studies
The purpose of the Workshop on Luminescence Techniques was threefold: (1) to review the state-of-the-art capabilities of luminescence methods, (2) to consider a variety of concepts for the development of future luminescence sensor systems, and (3) to discuss appropriate research and development strategies for advancing the current state-of-the-art....
Cognitive model for recreational spatial behavior in an urban area
Robert E. Lloyd, Robert Ader
1980, Southeastern Geographer (20) 145-159
No abstract available...
Modified fyke net for the capture and retention of salmon smolts in large rivers
S.K. Davis, J.L. Congleton, R.W. Tyler
1980, Progressive Fish-Culturist (42) 235-237
Modern sedimentary facies of the open Pacific coast and Pleistocene analogs from Montery Bay, California
W.R. Dupre, H.E. Clifton, R. E. Hunter, Michael E. Field
Michael E. Field, et al., editor(s)
1980, Conference Paper, Quaternary depositional environments of the Pacific Coast : Pacific Coast Paleogeography Symposium 4
Depositional processes and sedimentary structures of wave-dominated Pacific coastal environments vary systematically with water depth. The depth-limited open-coast facies identifiable by their sedimentary structures are the inner shelf, barred or nonbarred nearshore, beach, and coastal dune facies. These facies are most commonly preserved in shallowing-upward progradational sequences. The...
Paleoecological evaluation of Late Eocene biostratigraphic zonations of the Pacific Coast of North America
Kristin McDougall
1980, Paleontological Monograph (2) 1-75
The late Eocene zonal criteria of the west coast of North America are to a large extent controlled by paleoecology and, therefore, the correlation of coeval but environmentally different benthic foraminiferal faunas cannot be achieved before paleoecological control of the biostratigraphy is understood. The faunal trends, morphology, characteristic occurrences and...
Estimated inflow and evaporation for Great Salt Lake, Utah, 1931-76, with revised model for evaluating the effects of dikes on the water and salt balance of the lake: Comprehensive water planning program
K.M. Waddell, J.D. Barton
1980, Cooperative Investigations Report 20
No abstract available....
Storm runoff as related to urbanization in the Portland, Oregon-Vancouver, Washington Area
Antonius Laenen
1980, Water-Resources Investigations Report 80-689
A series of equations was developed to provide a better method of determining flood frequencies in the Portland-Vancouver urban area than is now available. The resulting regression equations can be used to compute peak discharge and storm runoff with a standard error of estimate of approximately 30 percent. Basins used...
Computer simulation models as tools for identifying research needs: A black duck population model
J.K. Ringelman, J. R. Longcore
1980, Transactions of the Northeast Section of the Wildlife Society, Annual Fish and Wildlife Conference (37) 182-193
Existing data on the mortality and production rates of the black duck (Anas rubripes) were used to construct a WATFIV computer simulation model. The yearly cycle was divided into 8 phases: hunting, wintering, reproductive, molt, post-molt, and juvenile dispersal mortality, and production from original and renesting attempts. The program computes...
Demography of the Everglade kite: Implications for population management
J.D. Nichols, Gary L. Hensler, P.W. Sykes Jr.
1980, Ecological Modelling (9) 215-232
Simple deterministic and stochastic population modelsi are used to examine the demographic patterns of the Everglade Kite population. These efforts are directed at making inferences about the evolution of the kite life-history pattern, and at providing guidelines for the management of the kite population. The Everglade Kite has...
On getting involved
Richard C. Banks
1980, The Auk (97) 637-638
The American Ornithologists' Union and its members had an early history of involvement in public affairs and conservation activities. A very active Committee on Bird Protection was among the first of the service committees to be established. In the 1880s it gathered data on the plumage trade and worked...
Local magnetic field measurements and fault creep observations on the San Andreas fault
M.J.S. Johnston, B.E. Smith, Robert O. Burford
1980, Tectonophysics (64) 47-57
Simultaneous creep and magnetic field records have been obtained for more than 60 episodic creep events since early 1974, no clear magnetic transients or offsets, as suggested by Breiner and Kovach (1968), are observed at or up to several days before the occurrence times of these events. Although some patterns...
First-order analysis of deformation of a thrust sheet moving over a ramp
Philip Berger, Arvid M. Johnson
1980, Tectonophysics (70) T9-T24
John L. Rich introduced the revolutionary concept that many folds in the Appalachian Mountains can be explained as superficial structures formed by passive translation of thrust blocks over ramps in detachment surfaces. The amount of layer-parallel shortening can be negligible in the formation of these folds. Rich primarily was concerned...
Geochemistry of amino acids in shells of the clam Saxidomus
K.A. Kvenvolden, D.J. Blunt, M.A. McMenamin, S.E. Straham
1980, Physics and Chemistry of the Earth (12) 321-332
Concentrations of amino acids and their corresponding dl">dl enantiomeric ratios have been measured in shells of the bivalve mollusk Saxidomus from eleven localities, ranging in age from modern to probably more than 500,000 yr, along the Pacific coast of North America. Natural logarithms of amino acid concentrations correlate...
Preliminary evaluation of lake susceptibility to water-quality degradation by recreational use, Alpine Lakes Wilderness Area, Washington
Robert J. Gilliom, D. P. Dethier, S. A. Safioles, P.L. Heller
1980, Water-Resources Investigations Report 80-1124
The relative susceptibility of lakes in the Alpine Lakes Wilderness Area to water-quality degradation was evaluated from two perspectives: (1) water-quality sensitivity, which is the tendency of a lake 's water quality to degrade in response to pollutant loading, and (2) pollutant-loading likelihood, which is determined by the presence of...
Handbook of acute toxicity of chemicals to fish and aquatic invertebrates : summaries of toxicity tests conducted at Columbia National Fisheries Research Laboratory, 1965-78
W. Waynon Johnson, Mack T. Finley
1980, Resource Publication 137
Acute toxicity is a major subject of research at Columbia National Fisheries Research Laboratory for evaluating the impact of toxic chemicals on fishery resources. The Laboratory has played a leading role in developing research technology for toxicity testing and data interpretation. In 1965-78, more than 400 chemicals were tested against...
