Geochemical evidence for Se mobilization by the weathering of pyritic shale, San Joaquin Valley, California, U.S.A.
T. S. Presser, W. C. Swain
1990, Applied Geochemistry (5) 703-717
Acidic (pH 4) seeps issue from the weathered Upper Cretaceous-Paleocene marine sedimentary shales of the Moreno Formation in the semi-arid Coast Ranges of California. The chemistry of the acidic solutions is believed to be evidence of current reactions ultimately yielding hydrous...
Fluid-inclusion technique for determining maximum temperature in calcite and its comparison to the vitrinite reflectance geothermometer
C.E. Barker, R.H. Goldstein
1990, Geology (18) 1003-1006
Theory, laboratory experiments, and empirical observation suggest that many aqueous fluid inclusions in calcite reequilibrate during overheating, and therefore some homogenization temperatures (Th) record a temperature close to the maximum reached by the rock. This characteristic suggests that aqueous fluid inclusions in calcite can be used to establish maximum temperature...
Radium distribution and indoor radon in the Pacific Northwest
J. S. Duval, J. K. Otton
1990, Geophysical Research Letters (17) 801-804
Aerial gamma-ray data were compiled to produce a map showing the distribution of radium (226Ra) in near-surface materials in the Pacific Northwest (Washington, Oregon, and Idaho, and parts of Montana, Wyoming, California, Nevada, and Utah). A comparison of measurements of indoor concentration levels of radon (222Rn)...
Magmatic unrest at Long Valley Caldera, California, 1980-1990
R. A. Bailey, D.P. Hill
1990, Geoscience Canada (17) 175-179
On May 25, 1980, the resort town of Mammoth Lakes, California, was shaken by a remarkable 48-hour-long earthquake sequence that included four M=6, two M=5 and 300 M=3 quakes. The nature of the precursory seismicity plus the unusual character of the May 25-27 sequence itself suggested that it was not...
Patrick Draw field, Wyoming - 1 seismic expression of subtle strat trap in Upper Cretaceous Almond
Robert T. Ryder, Myung W. Lee, Warren F. Agena, Robert C. Anderson
1990, Oil & Gas Journal (88) 54-57
The east flank of the Rock Springs uplift and the adjacent Wamsutter arch contain several large hydrocarbon accumulations. Among these accumulations are Patrick Draw field, which produces oil and gas from a stratigraphic trap in the Upper Cretaceous Almond formation, and Table Rock field, a faulted anticlinal trap that produces...
Age and progression of volcanism, Wrangell volcanic field, Alaska
D.H. Richter, James G. Smith, M. A. Lanphere, G. B. Dalrymple, B.L. Reed, Nora B. Shew
1990, Bulletin of Volcanology (53) 29-44
The Wrangell volcanic field covers more than 10 000 km2 in southern Alaska and extends uninterrupted into northwest. Yukon Territory. Lavas in the field exhibit medium-K, calc-alkaline affinities, typical of continental volcanic arcs along convergent plate margins. Eleven major eruptive centers are recognized in the Alaskan part of the field....
Potentiometric surface of the Edwards-Trinity aquifer system and contiguous hydraulically connected units, west-central Texas, winter, 1974-75
Eve L. Kuniansky
1990, Water-Resources Investigations Report 89-4208
The potentiometric surface of the Edwards-Trinity aquifer system and contiguous hydraulically connected units (from December 1974 through February 1975) was mapped as part of the Edwards-Trinity Regional Aquifer-System Analysis (RASA) project. A major goal of the Edwards-Trinity RASA project is to understand and describe the regional flow system (Bush, 1986)....
Preliminary geologic map of the Mohave Mountains area, Mohave County, western Arizona
K. A. Howard, J. E. Nielson, H. G. Wilshire, J. K. Nakata, J. W. Goodge, Steven L. Reneau, Barbara E. John, V. L. Hansen
1990, Open-File Report 90-684
No abstract available....
Development and application of conventional and satellite radio-tracking techniques for studying dugong movements and habitat use
H. Marsh, G. B. Rathbun
1990, Australian Wildlife Research (17) 83-100
Tracking wildlife by satellite: Current systems and performance
Richard B. Harris, Steven G. Fancy, David C. Douglas, Gerald W. Garner, Steven C. Amstrup, Thomas R. McCabe, Larry F. Pank
1990, Fish and Wildlife Technical Report 30
Since 1984, the U.S. Fish and Wildlife Service has used the Argos Data Collection and Location System (DCLS) and Tiros-N series satellites to monitor movements and activities of 10 species of large mammals in Alaska and the Rocky Mountain region. Reliability of the entire system was generally high. Data were...
Concentrations of boron, molybdenum, and selenium in chinook salmon
Steven J. Hamilton, Raymond H. Wiedmeyer
1990, Transactions of the American Fisheries Society (119) 500-510
The concentrations of boron, molybdenum, and selenium in young chinook salmon Oncorhynchus tshawytscha were determined in three partial life cycle chronic toxicity studies. In each study, fish were exposed to a mixture of boron, molybdenum, selenate, and selenite in the proportions found in subsurface agricultural drainage water in the basin...
Management of percids in Lake Erie, North America
Richard W. Hatch, Stephen J. Nepszy, Michael R. Rawson
W.L.T. van Densen, B. Steinmetz, R.H. Hughes, editor(s)
1990, Book chapter, Management of freshwater fisheries
Lake Erie's fish populations and their habitats have undergone very substantial changes since 1945. Of the four percid forms originally present, the blue pike (Stizostedion vitreum glaucum) is presumed extinct, and the sauger (S. canadense) was commercially extinct by the 1950's. The walleye (S. v. vitreum) has remained...
Use of social indices to predict reproductive success in canvasbacks
Jerome R. Serie, Lewis M. Cowardin
1990, Journal of Wildlife Management (54) 66-72
We correlated temporal changes in social groupings of canvasbacks (Aythya valisineria) breeding near Minnedosa, Manitoba, with an independent estimate of hen success during 1974-80. Roadside counts of pairs, lone males, and flocked males were made along transects at 5-day intervals, normalized to percentages to allow comparisons among years, and plotted...
Locations of NASQAN benchmark stations
K.J. Lanfear
1990, Report
Locations of NASQAN benchmark stations....
Effects of vegetation manipulation on breeding waterfowl in prairie wetlands--a literature review
H.A. Kantrud
1990, General Technical Report RM-194
No abstract available....
The laser microprobe mass analyser for determining partitioning of minor and trace elements among intimately associated macerals: An example from the Swallow Wood coal bed, Yorkshire, UK
P.C. Lyons, J.J. Morelli, D.M. Hercules, D. Lineman, C. L. Thompson-Rizer, F.T. Dulong
1990, Fuel (69) 771-775
A study of the elemental composition of intimately associated coal macerals in the English Swallow Wood coal bed was conducted using a laser microprobe mass analyser, and indicated a similar trace and minor elemental chemistry in the vitrinite and cutinite and a different elemental signature in the fusinite. Three to...
A tomographic glimpse of the upper mantle source of magmas of the Jemez lineament, New Mexico
W. Spence, R.S. Gross
1990, Journal of Geophysical Research Solid Earth (95) 10829-10849
The 800-km-long Jemez lineament is the most active volcanic feature in the southwestern United States. It is the southeastern tectonic boundary of the Colorado Plateau and crosses the Rio Grande rift at the Jemez Mountains. The primary volcanism of the lineament is basaltic and has occurred in the last 4.5...
Uranium-series ages of marine terraces, La Paz Peninsula, Baja California Sur, Mexico
L. Sirkin, Barney J. Szabo, G.A. Padilla, S.A. Pedrin, E.R. Diaz
1990, Coral Reefs (9) 25-30
Uranium-series dating of coral samples from raised marine terrace deposits between 1.5 and 10 m above sea level in the La Paz Peninsula area, Baja California Sur, yielded ages between 123 ka and 138 ka that are in agreement with previously reported results. The stratigraphy and ages of marine units...
Comparison of methods to determine degree of pyritization
J. Leventhal, C. Taylor
1990, Geochimica et Cosmochimica Acta (54) 2621-2625
Degree of pyritization (DOP) is a measure of the ratio pyrite iron/(pyrite iron + reactive iron) that can be related to the depositional environment of a sediment. Several methods of DOP determination have been used but not systematically evaluated. The determination/extraction of reactive (usually acid soluble) iron is critical to...
Regionalization in geology by multivariate classification
Jan Harff, J.C. Davis
1990, Mathematical Geology (22) 573-588
The concept of multivariate classification of "geological objects" can be combined with the concept of regionalized variables to yield a procedure for typification of geological objects, such as rock units, well records, or samples. Numerical classification is followed by subdivision of the area of investigation, and culminates in a regionalization...
Source parameters for small events associated with the 1986 North Palm Springs, California, earthquake determined using empirical Green functions
J. Mori, A. Frankel
1990, Bulletin of the Seismological Society of America (80) 278-295
Using small events as empirical Green functions, which include path, site, and instrument effects on the P waveforms, source parameters were estimated for 25 ML 3.4 to 4.4 events associated with the 1986 North Palm Springs earthquake. The static stress drops ranged from 3 to 80 bars, for moments of...
Deformation monitoring at Nevado del Ruiz, Colombia - October 1985 - March 1988
N.G. Banks, C. Carvajal, H. Mora, E. Tryggvason
1990, Journal of Volcanology and Geothermal Research (41) 269-295
Deformation studies began at Nevado del Ruiz 23 days before the devastating 13 November 1985 eruption, at least 12 months after precursory seismicity and fumarolic activity began. The late start in geodetic monitoring, limited number of stations in the pre-eruption network, and inconsistent patterns in the observed deformation limit conclusions...
Biostratigraphy, lithofacies and paleoenvironments of the Gulf 718-1 well, U.S. Mid-Atlantic Outer Continental Shelf
L.J. Poppe, R.E. Hall, H.L. Cousminer, R.W. Stanton, W.E. Steinkraus
1990, Marine Geology (92) 27-50
The Gulf 718-1 well, located on the southwestern flank of the Schlee Dome, was drilled to a total depth of 3905 m. The oldest sedimentary rocks sampled were not fossiliferous, but are probably of Late Jurassic age. Sandstones and siltstones are the dominant lithologies except in the intervals between 1213...
Characterization of hydrocarbon gas within the stratigraphic interval of gas-hydrate stability on the North Slope of Alaska, U.S.A.
T. S. Collett, K.A. Kvenvolden, L. B. Magoon
1990, Applied Geochemistry (5) 279-287
In the Kuparuk River Unit 2D-15 well, on the North Slope of Alaska, a 60 m-thick stratigraphic interval that lies within the theoretical pressure-temperature field of gas-hydrate stability is inferred to contain methane hydrates. This inference is based on interpretations from...
Comparison of Darcian flow in corresponding flat and folded surfaces
Emanuel Weiss
1990, Water Resources Research (26) 1775-1785
Folds of aquifers are rarely accounted for in models of groundwater flow. To account for aquifer folds in groundwater flow models, the equation describing Darcian flow in a general surface is derived. The equation is used to calculate steady state hydraulic head distributions for corresponding folded and flat surfaces. Each...
