Late Cenozoic volcanic rocks of the southern Sierra Nevada, California: II. Geochemistry: Summary
F. C. W. Dodge, J.G. Moore
1981, Geological Society of America Bulletin, Part I (92) 912-914
The geology and petrology of the Cenozoic volcanic rocks of the region of California between 38° and 35°45'N latitude and 117°30' and 120°W longitude, including the rocks of a major potassic magmatic province on the west slope of the Sierra Nevada, have been...
Pyrolysis gas chromatography-mass spectrometry to characterize organic matter and its relationship to uranium content of Appalachian Devonian black shales
J.S. Leventhal
1981, Geochimica et Cosmochimica Acta (45) 883-889
Gas Chromatographic analysis of volatile products formed by stepwise pyrolysis of black shales can be used to characterize the kerogen by relating it to separated, identified precursors such as land-derived vitrinite and marine-source Tasmanites. Analysis of a Tasmanites sample shows exclusively n-alkane">n-alkane and -alkene pyrolysis products, whereas a vitrinite...
Volgograd and vicinity: a Landsat view
William A. Dando, Gary E. Johnson
1981, Journal of Geography (80) 235-237
Many diverse features can be discerned on the Landsat image of Volgograd and vicinity. Some of these features have resulted directly from man's alteration of the land surface in accordance with Stalin's and Khrushchev's plans for control of climate and for development in Volgograd and the surrounding area. Landsat images...
The eastern front of the Sierra Nevada; prone to earthquakes and volcanic eruption
C.D. Rinehart, W. C. Smith
1981, Earthquake Information Bulletin (USGS) (13) 216-224
On Sunday morning, May 25, 1980, the weather at Mammoth Lakes, Calif., was sunny and brisk. Suddenly, just before 9:33 a.m, the world became a jarring, lurching, unstable place. Along the front of the Sierra Nevada, the muffled thunder of rockfalls and avalanches prolonged the confusion of sound and motion...
Origin and structural implications of upper Miocene rhyolites in Kingston Canyon, Piute County, Utah
P. D. Rowley, T. A. Steven, H. H. Mehnert
1981, Geological Society of America Bulletin (92) 590-602
Kingston Canyon is one of the deepest antecedent canyons in the High Plateaus subprovince of the Colorado Plateaus. Here the East Fork of the Sevier River flows westward transversely across the gently east tilted Sevier Plateau, which is developed on a basin-range fault...
The U.S. Earthquake Prediction Program
R. L. Wesson, J.R. Filson
1981, Earthquake Information Bulletin (USGS) (13) 164-174
Following on from the concepts of plate tectonics, the earth sciences are now embarking on a challenging course- the time prediction of geologic phenomena. Earthquake prediction is an outstanding example of this. However, earthquake prediction is not the only scientific goal. The destructive power of a large earthquake requires that...
Mesurol as a bird repellent on wine grapes in Oregon and California
R. L. Hothem, D. F. Mott, R. W. DeHaven, J. L. Guarino
1981, American Journal of Enology and Viticulture (32) 150-154
Field tests were conducted in California and Oregon from July to October 1978 to evaluate the effectiveness of Mesurol as a repellent to reduce bird damage to ripening wine grapes. A block of vines composed of two similar, adjacent plots was delineated at each of 20 vineyards. One randomly...
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)...
The distribution of uranium and thorium in granitic rocks of the basin and range province, Western United States
J.M. McNeal, D. E. Lee, Hugh T. Millard Jr.
1981, Journal of Geochemical Exploration (14) 25-40
Some secondary uranium deposits are thought to have formed from uranium derived by the weathering of silicic igneous rocks such as granites, rhyolites, and tuffs. A regional geochemical survey was made to determine the distribution of uranium and thorium in granitic rocks of the Basin and Range province in order...
A stochastic fault model. 2. Time-dependent case
D.J. Andrews
1981, Journal of Geophysical Research Solid Earth (86) 10821-10834
A random model of fault motion in an earthquake is formulated by assuming that the slip velocity is a random function of position and time truncated at zero, so that it does not have negative values. This random function is chosen to be self-affine; that is, on change of length...
Trace elemental analysis of bituminuos coals using the Heidelberg proton microprobe
J.R. Chen, H. Kneis, B. Martin, R. Nobiling, K. Traxel, E. C. T. Chao, J.A. Minkin
1981, Nuclear Instruments and Methods (181) 151-157
Trace elements in coal can occur as components of either the organic constituents (macerals) or the inorganic constituents (minerals). Studies of the concentrations and distribution of the trace elements are vital to understanding the geochemical millieu in which the coal was formed and in evaluating the attempts to recover rare...
A transient laboratory method for determining the hydraulic properties of 'tight' rocks-II. Application
C. E. Neuzil, C. Cooley, Stephen E. Silliman, J.D. Bredehoeft, P. A. Hsieh
1981, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (18) 253-258
In Part I a general analytical solution for the transient pulse test was presented. Part II presents a graphical method for analyzing data from a test to obtain the hydraulic properties of the sample. The general solution depends on both hydraulic conductivity and specific storage and, in theory, analysis of...
Two-mica granites of northeastern Nevada
D. E. Lee, R. W. Kistler, I. Friedman, R. E. Van Loenen
1981, Journal of Geophysical Research Solid Earth (86) 10607-10616
The field settings are described and analytical data are presented for six two-mica granites from north-eastern Nevada. High δ18O and 87Sr/86Sr values indicate that all are S-type granites, derived from continental crust. The major element chemistry and accessory mineral contents of these rocks also are characteristic of S-type granites. Chemical, X...
Seismic amplitude anomalies associated with thick First Leo sandstone lenses, eastern Powder River basin, Wyoming
A. H. Balch, Myung W. Lee, J. J. Miller, R. T. Ryder
1981, Geophysics (46) 1519-1527
Several new discoveries of oil production in the Leo sandstone, an economic unit in the Pennsylvanian middle member of the Minnelusa formation, eastern Powder River basin, Wyoming-Nebraska-South Dakota, have renewed exploration interest in this area. Vertical seismic profiles (VSP) and model studies suggested that a measurable seismic amplitude anomaly is...
Stratigraphy of the Caloris basin, Mercury
J.F. McCauley, J. E. Guest, G. G. Schaber, N.J. Trask, R. Greeley
1981, Icarus (47) 184-202
Caloris basin, Mercury’s youngest large impact basin, is filled by volcanic plains that are spectrally distinct from surrounding material. Post-plains impact craters of a variety of sizes populate the basin interior, and the spectra of the material they have...
Munsell color value as related to organic carbon in Devonian shale of Appalachian basin
John W. Hosterman, Sallie I. Whitlow
1981, American Association of Petroleum Geologists Bulletin (65) 333-335
Comparison of Munsell color value with organic carbon content of 880 samples from 50 drill holes in the Appalachian basin shows that a power curve is the best fit for the data. A color value below 3 to 3.5 indicates the presence of organic carbon but is meaningless in determining...
A lithologic-tectonic framework for the metallogenic provinces of California
J. P. Albers
1981, Economic Geology (76) 765-790
The lithologic-tectonic framework of California developed principally during Mesozoic time when various terranes of oceanic crust and island-arc crust were accreted to older sialic crust, resulting in westward growth of the continent. Emplacement of great batholithic masses of granitoid rocks cutting all these crustal types also took place during the...
Boulder deposits and the retreat of mountain slopes, or ' gully gravure' revisited
H. H. Mills
1981, Journal of Geology (89) 649-660
Observations on mountains composed chiefly of shale and capped with Tuscarora Sandstone in the Valley and Ridge province of southwest Virginia suggest that slopes retreat by a process similar to but different from Bryan's (1940) "gully gravure." The process appears to operate as follows: Bouldery alluvium protects the floors of...
The partitioning of copper among selected phases of geologic media of two porphyry copper districts, Puerto Rico
R. E. Learned, T. T. Chao, R. F. Sanzolone
1981, Journal of Geochemical Exploration (15) 563-581
In experiments designed to determine the manner in which copper is partitioned among selected phases that constitute geologic media, we have applied the five-step sequential extraction procedure of Chao and Theobald to the analysis of drill core, soils, and stream sediments of the Rio Vivi and Rio Tanama porphyry copper...
The occurrence of chlorine in serpentine minerals
Y. Miura, J. Rucklidge, Gordon L. Nord Jr.
1981, Contributions to Mineralogy and Petrology (76) 17-23
Partially serpentinized dunites containing small amounts of Chlorine (< 0.5%) from Dumont, Quebec, and Horoman, Hokkaido, Japan, and one containing less than 0.05% Chlorine from Higashi-Akaishi-Yama, Ehime, Japan have been examined using the electron probe microanalyzer and scanning transmission electron microscope with X-ray analytical capabilities. Chlorine was found together with...
Uranium in big sagebrush from western U.S. and evidence of possible mineralization in the Owyhee mountains of Idaho
J. A. Erdman, G.H. Harrach
1981, Journal of Geochemical Exploration (14) 83-94
Two regional studies of big sagebrush (Artemisia tridentata), a widely distributed and dominant shrub in the western United States, have shown its responsiveness to known uranium mineralization in the Monument Hill and Pumpkin Buttes districts of the southern Powder River Basin, Wyoming, and the Uravan mineral belt area in southeastern...
Manganese cycles and the origin of manganese nodules, Oneida Lake, New York, U.S.A.
W.E. Dean, W.S. Moore, K.H. Nealson
1981, Chemical Geology (34) 53-64
Oneida Lake is a large shallow lake in central New York that is characterized by high algal productivity and concentrated deposits of freshwater manganese nodules. Budgets for Mn in the lake and its tributaries show a net loss of 23 metric tons of manganese within the lake per year with...
The late-Neoglacial histories of the Agassiz and Jackson glaciers, Glacier National Park, Montana.
P. E. Carrara, R. G. McGimsey
1981, Arctic and Alpine Research (13) 183-196
Twenty-one tree-ring stations, totaling 116 trees, were sampled at various localities within the forest trimlines fronting the Agassiz and Jackson glaciers, Glacier National Park, Montana. Tree ages within these zones became progressively younger from the region of the maximum late-Neoglacial position to the bases of the bedrock slopes on which...
The Galapagos Spreading Centre at 86° W: A detailed geothermal field study
K.E. Green, R. P. Von Herzen, D.L. Williams
1981, Journal of Geophysical Research Solid Earth (86) 979-986
We report here measurements of the heat flow field of the Galapagos Spreading Center on crust of age less than 1.0 m.y. The 443 measurements in an area of about 570 km2 reveal the general planform of the geothermal flux and permit the first truly areal estimate of the near-axis conductive...
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...
