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Page 5062, results 126526 - 126550

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Not all publications have extents, not all extents are completely accurate
Effects of the rate of releases from Sam Rayburn Reservoir on the aeration capacity of the Angelina River, eastern Texas
Jack Rawson, Richard L. Goss, Ira G. Rathbun
1980, Water-Resources Investigations Report 80-58
A three-phase study was conducted during July and August 1979 to determine the effects of varying release rates through the power-outlet works at Sam Rayburn Reservoir, eastern Texas, on aeration capacity of a 14-mile reach of the Angelina River below Sam Rayburn Dam. The dominant factors that affected the aeration...
Evolution of the continental margin of southern Spain and the Alboran Sea
William P. Dillon, James M. Robb, H. Gary Greene, Juan Carlos Lucena
1980, Marine Geology (36) 205-226
Seismic reflection profiles and magnetic intensity measurements were collected across the southern continental margin of Spain and the Alboran basin between Spain and Africa. Correlation of the distinct seismic stratigraphy observed in the profiles to stratigraphic information obtained from cores at Deep Sea Drilling Project site 121 allows effective dating...
Computational methods for a three-dimensional model of the petroleum-discovery process
J.H. Schuenemeyer, W.J. Bawiec, L.J. Drew
1980, Computers & Geosciences (6) 323-360
A discovery-process model devised by Drew, Schuenemeyer, and Root can be used to predict the amount of petroleum to be discovered in a basin from some future level of exploratory effort: the predictions are based on historical drilling and discovery data. Because marginal costs of discovery and production are a...
Regional tilt patterns of Late Cenozoic basin-range fault blocks, western United States.
John H. Stewart
1980, Geological Society of America Bulletin (91) 460-464
The pattern of tilt domains is characterized by transverse zones or boundaries, parallel to the extension direction, and by antiformal (tilts away from) and synformal (tilts toward) boundaries at right angles to the extension direction. Tilting of ranges averages about 15o to 20o in Nevada and Utah and indicates extension...
Kinetic model for the short-term dissolution of a rhyolitic glass
A. F. White, H.C. Claassen
1980, Chemical Geology (28) 91-109
Aqueous dissolution experiments with the vitric phase of a rhyolitic tuff were performed at 25??C and constant pH in the range 4.5-7.5. Results suggest interchange of aqueous hydrogen ions for cations situated both on the surface and within the glass. At time intervals from 24 to 900 hr., dissolution kinetics...
Influence of San Gabriel submarine canyon on narrow-shelf sediment dynamics, southern California
Herman A. Karl
1980, Marine Geology (34) 61-78
Variations in the concentration of total suspended particulate matter (TSM) collected 1 m above bottom, changes in vertical profiles of light transmission, and substrate textural patterns reveal a corridor for preferential sediment transport on San Pedro continental shelf, California. During the winter, this corridor, designated the preferential transport corridor (PTC),...
Volcanic rocks cored on hess rise, Western Pacific Ocean
T.L. Vallier, K.E. Windom, K.E. Seifert, Jorn Thiede
1980, Nature (286) 48-50
Large aseismic rises and plateaus in the western Pacific include the Ontong-Java Plateau, Magellan Rise, Shatsky Rise, Mid-Pacific Mountains, and Hess Rise. These are relatively old features that rise above surrounding sea floors as bathymetric highs. Thick sequences of carbonate sediments overlie, what are believed to be, Upper Jurassic and...
Geophysical investigations in deep horizontal holes drilled ahead of tunnelling
R. D. Carroll, M.J. Cunningham
1980, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (17) 89-107
Deep horizontal drill holes have been used since 1967 by the Defense Nuclear Agency as a primary exploration tool for siting nuclear events in tunnels at the Nevada Test Site. The U.S. Geological Survey had developed geophysical logging techniques for obtaining resistivity and velocity in these holes, and to date...
Inland (non-tidal) wetland mapping.
W.R. Steward, V. Carter, P. D. Brooks
1980, Photogrammetric Engineering and Remote Sensing (46) 617-628
The US Geological Survey has prepared three experimental wetland maps for the Auburndale, Florida 1:24,000-scale quadrangle. Wetland classes and boundaries were interpreted from quad centered high altitude color infrared and superwide black and white panchromatic photographs onto a black and white orthophoto base map made from a color infrared photograph....
Stable isotope variations in the Quaternary epithermal calcite-fluorite deposit at Monte delle Fate near Cerveteri (Latium, central Italy)
U. Masi, J. R. O’Neil
1980, Mineralium Deposita (15) 41-45
Carbon, oxygen and hydrogen isotope variations have been measured in samples from the epithermal fluorite vein deposit at Monte delle Fate, Latium. The ranges in ?? 13C and ??18O of calcite are -1.3 to 3.4 and 9.5 to 17.3, respectively. ??D values of water extracted from fluid inclusions are -49...
Treasures from the deep ( Metallic nodules).
D.Z. Piper
1980, Water Spectrum (13) 8-15
The composition, distribution, metric growth rates and variations in sea-floor metallic nodules are outlined and discussed The considerable age, slow accretion and relationship to underlying sediments are problems of origin which are yet to be solved and some speculative answers are discussed. Mining of the nodules is reviewed and its...
Measurement of irrigated acreage in Western Kansas from LANDSAT images
K.M. Keene, C.D. Conley
1980, Environmental Geology (3) 107-116
In the past four decades, irrigated acreage in western Kansas has increased rapidly. Optimum utilization of vital groundwater supplies requires implementation of long-term water-management programs. One important variable in such programs is up-to-date information on acreage under irrigation. Conventional ground survey methods of estimating irrigated acreage are too slow to...
Crude oil degradation as an explanation of the depth rule
L.C. Price
1980, Chemical Geology (28) 1-30
Previous studies of crude oil degradation by water washing and bacterial attack have documented the operation of these processes in many different petroleum basins of the world. Crude oil degradation substantially alters the chemical and physical makeup of a crude oil, changing a light paraffinic low-S "mature" crude to a...
Computational methods for inverse problems in geophysics: Inversion of travel time observations
V. Pereyra, H.B. Keller, W.H.K. Lee
1980, Physics of the Earth and Planetary Interiors (21) 120-125
General ways of solving various inverse problems are studied for given travel time observations between sources and receivers. These problems are separated into three components: (a) the representation of the unknown quantities appearing in the model; (b) the nonlinear least-squares problem; (c) the direct, two-point ray-tracing problem used to compute...
Leg 67: the Deep Sea Drilling Project Mid-America Trench transect off Guatemala.
Roland E. von Huene
1980, Geological Society of America Bulletin (91) 421-432
Drilling on the Cocos plate recovered a basal chalk sequence deposited during early and mid-Miocene time, a short interval of abyssal red clay, and an upper sequence of late Miocene and younger sediment deposited within an area influenced by a terrigenous source. In the trench, a mud and sand fill...
Remote sensing of snow and ice
M. F. Meier
1980, Hydrological Sciences Bulletin (25) 307-330
Monitoring of snow and ice on the Earth's surface will require increasing use of satellite remote sensing techniques. These techniques are evolving rapidly. Active and passive sensors operating in the visible, near infrared, thermal infrared, and microwave wavelengths are described in regard to general applications and in regard to specific...
Rate of mercury loss from contaminated estuarine sediments
Michael H. Bothner, R.A. Jahnke, M. L. Peterson, R. Carpenter
1980, Geochimica et Cosmochimica Acta (44) 273-285
The concentration of mercury in contaminated estuarine sediments of Bellingham Bay, Washington was found to decrease with a half-time of about 1.3 yr after the primary anthropogenic source of mercury was removed. In situ measurements of the mercury flux from sediments, in both dissolved and volatile forms, could not account...