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Page 4370, results 109226 - 109250

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Not all publications have extents, not all extents are completely accurate
Relationship between weathered coal deposits and the etiology of Balkan endemic nephropathy
G. L. Feder, Z. Radovanovic, R. B. Finkelman
1991, Conference Paper, Kidney International
Field studies in epidemiology and environmental geochemistry in areas in Yugoslavia containing villages with a high incidence of Balkan endemic nephropathy (BEN), indicate a possible relationship between the presence of low-rank coal deposits and the etiology of BEN. Preliminary results from qualitative chemical analyses of drinking water from shallow farm...
On the formation of granulites
S.R. Bohlen
1991, Journal of Metamorphic Geology (9) 223-229
The tectonic settings for the formation and evolution of regional granulite terranes and the lowermost continental crust can be deduced from pressure–temperature–time (P–T–time) paths and constrained by petrological and geophysical considerations.P–T conditions deduced for regional granulites require transient, average geothermal gradients of greater than 35°C km−1, implying minimum heat flow in...
Gravitational circulation in a tidal strait
P. E. Smith, R. T. Cheng, J.R. Burau, M.R. Simpson
Shane Richard M., editor(s)
1991, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Eight months of continuous measurements of tidal current profiles with an acoustic Doppler current profiler (ADCP) were made in Carquinez Strait, California, during 1988 for the purpose of estimating long-term variations in vertical profiles of Eulerian residual currents. Salinity stratification near the ADCP deployment site also was analyzed. The strength...
Seismic response of transamerica building. II. System identification
E. Safak, M. Çelebi
1991, Journal of Structural Engineering (117) 2405-2425
A detailed analysis of the recorded seismic response of the Transamerica Building during the October 17, 1989 Loma Prieta earthquake is presented. The system identification algorithm used for the analysis is based on the discrete-time linear filtering approach with least-squares approximation, and assumes a multi-input, single-output model for the building....
Mineralogy of the silt fraction in surficial sediments from the outer continental shelf off southeastern New England
L.J. Poppe, J.A. Commeau, P. C. Valentine
1991, Journal of Sedimentary Petrology (61) 54-64
The silt-sized heavy mineral assemblage, which is predominantly detrital, has been concentrated in this fraction by hydraulic factors and ranges between 11.8 wt. % of the silt fraction in the sandy sediments near Georges Bank to 3.4% in the clayey silt deposit south of Martha's Vineyard. By contrast, the sand...
Evolution of a Permo-Triassic sedimentary melange, Grindstone terrane, east-central Oregon
C.D. Blome, M.K. Nestell
1991, Geological Society of America Bulletin (103) 1280-1296
The Grindstone terrane in east-central Oregon is one of the few areas in western North America where large blocks of unmetamorphosed Devonian, Mississippian, and Permian limestones are inter mixed with Permian and Lower Triassic radiolarian chert and Pennsylvanian?, Permian, and Triassic volcaniclastic rocks. Although originally described as parts of a...
Age and geomorphic history of Meteor Crater, Arizona, from cosmogenic 36Cl and 14C in rock varnish
F. M. Phillips, M.G. Zreda, S.S. Smith, D. Elmore, P.W. Kubik, R.I. Dorn, D. J. Roddy
1991, Geochimica et Cosmochimica Acta (55) 2695-2698
Using cosmogenic 36Cl buildup and rock varnish radiocarbon, we have measured the exposure age of rock surfaces at Meteor Crater, Arizona. Our 36Cl measurements on four dolomite boulders ejected from the crater by the impact yield a mean age of 49.7 ± 0.85 ka, which is in excellent agreement with an average...
Studies of a peatified angiosperm log cross section from Indonesia by nuclear magnetic resonance spectroscopy and analytical pyrolysis
Anne L. Bates, Patrick G. Hatcher, Harry E. Lerch, C. B. Cecil, S.G. Neuzil, Supardi
1991, Organic Geochemistry (17) 37-45
Samples from a 10 cm cross-sectional radius of a peatified angiosperm log from Sumatra, Indonesia, were examined by 13C nuclear magnetic resonance and pyrolysis-gas chromatography in order to understand chemical changes due to the peatification process. NMR results show degradation by selective loss...
Multicycle slip distribution along a laboratory fault
Chi-Yu King
1991, Journal of Geophysical Research (96)
Slip distribution along a laboratory fault, which consists of eight spring-connected blocks that are elastically driven to slide on a frictional surface, has been examined for a “long” sequence of slip events to test the applicability of some conceptual models proposed recently in the literature. The...
Relation of sediment load and flood-plain formation to climatic variability, Paria River drainage basin, Utah and Arizona
J.B. Graf, R. H. Webb, R. Hereford
1991, Geological Society of America Bulletin (103) 1405-1415
Suspended-sediment load, flow volume, and flood characteristics of the Paria River were analyzed to determine their relation to climate and flood-plain alluviation between 1923 and 1986. Flood-plain alluviation began about 1940 at a time of decreasing magnitude and frequency of floods in winter, summer, and fall. No floods with stages...
Organic matter variations in transgressive and regressive shales
M.A. Pasley, W.A. Gregory, G.F. Hart
1991, Organic Geochemistry (17) 483-509
Organic matter in the Upper Cretaceous Mancos Shale adjacent to the Tocito Sandstone in the San Juan Basin of New Mexico was characterized using organic petrology and organic geochemistry. Differences in the organic matter found in these regressive and transgressive offshore marine sediments have been documented and assessed within a...
Stress magnitudes in the crust: constraints from stress orientation and relative magnitude data
M.L. Zoback, M. Magee
1991, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (337) 181-194
The World Stress Map Project is a global cooperative effort to compile and interpret data on the orientation and relative magnitudes of the contemporary in situ tectonic stress field in the Earth's lithosphere. The intraplate stress field in both the oceans and continents is largely compressional with one or both...
Spatial Data Transfer Standard and efforts to develop a federal Profile for Vector Data
Matthew H. McDermott, Anthony DeWitt
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The ongoing efforts to create a more accessible and user friendly Spatial Data Transfer Standard include the development of a Profile for Vector Data and the development of a library of public domain software tools to support the encoding and decoding process. A profile is, in effect, a limited subset...