G. S. Gohn, R.E. Weems, S. F. Obermeier, R. L. Gelinas
1984, Open-File Report 84-670
No abstract available....
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Publication Extents
Not all publications have extents, not all extents are completely accurateT. M. Bown, E.L. Simons
1984, Nature (308) 447-449
Metatherian (marsupial) and eutherian (placental) mammals are end members of a complex, possibly common North American1-4 or, less likely, a South American5 stock that diverged before the early late Cretaceous and underwent separate adaptive radiations establishing them as the two dominant mammalian groups (subclass Theria). By the later Cretaceous, marsupials...
T. T. Chao
1984, Journal of Geochemical Exploration (20) 101-135
Application of partial dissolution techniques to geochemical exploration has advanced from an early empirical approach to an approach based on sound geochemical principles. This advance assures a prominent future position for the use of these techniques in geochemical exploration for concealed mineral deposits. Partial dissolution techniques are classified as single...
Roger N. Clark, T. L. Roush
1984, Journal of Geophysical Research (89) 6329-6340
Several methods for the analysis of remotely sensed reflectance data are compared, including empirical methods and scattering theories, both of which are important for solving remote sensing problems. The concept of the photon mean optical path length and the implications for use in modeling reflectance spectra are presented. It is...
I. Heard, F. E. Senftle
1984, Fuel (63) 221-226
Solutions of 30% H2O2 ranging from pH = 0 to pH = 11.5 have been used to oxidize anthracite at room temperature. The inorganic impurities, primarily pyrite, catalysed the oxidation and reduction of H2O2 (the Fenton reaction) to form the hydroxyl radical; the oxidation of the organic matter was minimal and was observed only in strong...
R. B. Finkelman, D.S. Simons, F.T. Dulong, E.B. Steel
1984, International Journal of Coal Geology (3) 279-289
An ion microprobe mass analyzer (IMMA) has been used to analyze semi-quantitatively mineral-rich coal particles from two separate facies of the Upper Freeport coal bed. Accuracy is estimated to be ∓ 20% for those elements making up more than 0.1 wt.%...
J. S. Stacey, C. E. Hedge
1984, Geology (12) 310-313
We report zircon U-Pb, feldspar common Pb, whole-rock Sm-Nd, and Rb-Sr data from sample Z-103, a fine-grained granodiorite from the Jabal Khida region of the Saudi Arabian Shield (lat 21°19′N; long 44°50′W). The measurements yield conclusive evidence for continental crust of early Proterozoic...
W. J. Kockelman, C.C. Campbell
1984, Environmental Geology and Water Sciences (6) 67-78
Five examples illustrate how geologic and seismologic information can be used to reduce the effects of earthquakes Included are procedures for anticipating damage to critical facilities, preparing, adopting, or implementing seismic safety studies, plans, and programs, retrofitting highway bridges, regulating development in areas subject to fault-rupture, and strengthening or removing...
W.E. Dean, George E. Claypool, J. Thide
1984, Organic Geochemistry (7) 39-51
Complete records of organic-carbon-rich Cretaceous strata were continuouslycored on the flanks of the Mid-Pacific Mountains and southern Hess Rise in the central North Pacific Ocean during DSDP Leg 62. Organic-carbon-rich laminated silicified limestones were deposited in the western Mid-Pacific Mountains during the early Aptian, a time when that region was...
A. Afifi, B. R. Doe, P.K. Sims, M.H. Delevaux
1984, Economic Geology (79) 338-353
Lead was probably derived from 3.7-b.y.-old source material about 1.8 to 1.9 b.y. ago. Data on metavolcanic and granitic rocks from the belt show that the U-Th-Pb systems in most were reset about 1.6 b.y. ago; a time of shearing and retrogressive metamorphism. A concordia plot of the whole-rock lead...
R. C. Berg
1984, Geoderma (32) 45-62
A beach ridge and dune complex with good radiocarbon control sampling the last 3500 radiocarbon years B.P. provides new insights on the early genesis of clay bands in sandy soils. Soil profiles were sampled by age groups, described in the field, and then subjected to laboratory analyses for particle-size distribution,...
T. F. Kraemer, D.F. Reid
1984, Chemical Geology (46) 153-174
Radium has been measured in deep saline formation waters produced from a variety of U.S. Gulf Coast subsurface environments, including oil reservoirs, gas reservoirs and water-producing geopressured aquifers. A strong positive correlation has been found between formation-water salinity and Ra...
R. A. Gulbrandsen, C. E. Roberson, S.T. Neil
1984, Geochimica et Cosmochimica Acta (48) 213-218
Carbonate fluorapatite has been synthesized in seawater in an experiment of nearly 10-years duration. The addition of phosphate to seawater whose fluoride concentration had been increased to 7.6 mg/l brought about an initial amorphous phosphate precipitate. After 20 months, a crystalline magnesium phosphate phase developed within the amorphous phosphate. Crystallization...
Kathryn M. Scanlon
1984, Geo-Marine Letters (4) 1-4
The first continuous overview of a large segment of the continental slope and rise off the northeastern United States has been obtained using the GLORIA II long-range sidescan-sonar system. Extensive dissection by canyon and gully systems and evidence of possible large-scale sediment sliding are seen on the slope. The style...
D.P. Hill
1984, Bulletin Volcanologique (47) 371-395
Recent patterns of geologic unrest in long Valley caldera in east-central California emphasize that this large, silicic volcanic system and the adjacent, geologically youthful Inyo-Mono Craters volcanic chain are still active and capable of producing locally hazardous volcanic eruptions. A series of four magnitude -6 earthquakes in May 1980 called...
W. W. Hays
1984, Engineering Geology (20) 13-23
Zoning of the earthquake ground-shaking hazard — the division of a region into geographic areas having a similar relative severity or response to ground shaking — has been a goal in the United States for about fifty years. During this period,...
Diane M. McKnight, G. L. Feder
1984, Hydrobiologia (119) 129-138
Periphyton and benthic invertebrates assemblages were studied at the confluence of two Rocky Mountain streams, Deer Creek and the Snake River near Montezuma, Colorado. Upstream from the confluence the Snake River is acidic and enriched in dissolved trace metals, while Deer Creek is a typical Rocky Mountain stream. In the...
Allen H. Watkins, D. T. Lauer, G. B. Bailey, D. G. Moore, W. G. Rohde
1984, Conference Paper
Space remote sensing systems are compared for suitability in assessing and monitoring the Earth's renewable resources. Systems reviewed include the Landsat Thematic Mapper (TM), the National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR), the French Systeme Probatoire d'Observation de la Terre (SPOT), the German Shuttle Pallet...
F. Andrawes, G. Holzer, E. Roedder, E.K. Gibson Jr., John Oro
1984, Journal of Chromatography A (302) 181-193
Most geological samples and some synthetic materials contain fluid inclusions. These inclusions preserve for us tiny samples of the liquid and/or the gas phase that was present during formation, although in some cases they may have undergone significant changes from the original material. Studies of the current composition of the...
M. A. Fisher, Roland E. von Huene
1984, Journal of Geophysical Research Solid Earth (89) 11333-11351
The Border Ranges fault separates structurally complex accreted Cretaceous rocks from less deformed middle or late Paleozoic and younger rocks in the Cook-Shelikof basin. Of the five types of geophysical data used to investigate this fault, gravity data give the clearest indication of its presence and crustal structure. For at...
I. Friedman, W. Long
1984, Journal of Non-Crystalline Solids (67) 127-133
Natural glass can be formed by volcanic processes, lightning (fulgarites) burning coal, and by meteorite impact. By far the most common process is volcanic - basically the glass is rapidly chilled molten rock. All natural glasses are thermodynamically unstable and tend to alter chemically or to crystallize. The rate of...
Kenneth E. Bencala, Vance C. Kennedy, Gary W. Zellweger, Alan P. Jackman, Ronald J. Avanzino
1984, Water Resources Research (20) 1797-1803
An experimental injection was performed to study the transport of stream water solutes under conditions of significant interaction with streambed sediments in a mountain pool-and-riffle stream. Experiments were conducted in Little Lost Man Creek, Humboldt County, California, in a period of low flow duringwhich only a part of the bank-full...
Lawrence C. Rowan, Williams Collins, Marguerite J. Kingston, James K. Crowley
1984, Conference Paper
This paper describes the distinctive spectral reflectance of these two carbonatites and their related rocks, and also discusses the possible use of spectral reflectance measurements for exploring carbonatites. Laboratory spectra recorded in the 0. 4-2. 5 micrometer wavelength range showed absorption features discussed in the abstract. High spectral-resolution airborne radiance...
David H. Oppenheimer, Jerry P. Eaton
1984, Journal of Geophysical Research (89) 10267-10282
This paper examines relative Pn arrival times, recorded by the U. S. Geological Survey seismic network in central and northern California from an azimuthally distributed set of regional earthquakes. Improved estimates are presented of upper mantle velocities in the Coast Ranges, Great Valley, and Sierra Nevada foothills and estimates of...
J. A. Erdman, P.J. Modreski
1984, Journal of Geochemical Exploration (20) 75-84
Samples of stream sediments and aquatic mosses were collected from nine sites across several mineralized zones at the southeasternmost extension of the Idaho Cobalt Belt. Because the steepness of the terrain and the attendant high flow rate of the streams made it difficult to obtain adequate sediment samples, mosses were...