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Now showing items 321-340 of 445
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Scanning Electron Microscopy of the Fine Fraction of Recent Carbonate Sediments From Bimini, Bahamas (1970)
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(1992)Mineralogical, chemical, and isotopic analyses of clay minerals from outcrops and playa sediments, as well as chemical and isotopic analyses of groundwater and interstitial playa pore waters, have been used to improve ...
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(2017-07-19)The Cypress Formation (Upper Mississippian) is the most oil-productive unit in the Illinois Basin, USA. In the central part of the basin, the Cypress Formation contains sandstones up to 60 m thick in a northeast-southwest ...
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(1994)This dissertation investigates dynamic processes in the mantle using source parameters, waveforms, and travel times associated with deep-focus earthquakes. First, I systematically determined the focal mechanisms and depths ...
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(2002)Using high-resolution, triplicate body waveforms, I investigate strong lateral variations in P- and SH-wave speeds (VP and VS) beneath the Tonga subduction zone where cold lithosphere is subducting rapidly at 200 mn/yr. ...
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(2009)Additional evidence for this conclusion comes from my study of eleven intracontinental earthquakes, with magnitudes ranging from 4.9 to 6, which occurred in the mantle beneath the western Himalayan syntaxis, the western ...
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(2007)For the continental collision zone, I show that due to high VP near the bottom of the mantle transition zone, the contrast in VP across the 660-km discontinuity beneath central Tibet is small (around 3.1%): only about 70% ...
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(2011-08-25)Seismic methods using natural earthquakes are commonly applied to investigate the velocity structures of the crust and upper mantle. Among all these methods, seismic tomography is one of the most powerful tools to image ...
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Selenium and Chromium Stable Isotopes and the Fate of Redox-Active Contaminants in the Environment (2003)In the second part of this study, I developed the chromium stable isotope system as a biogeochemical indicator and monitoring tool. After initial work designing the techniques, I measured chromium stable isotope fractionation ...
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(2007)Wetlands remove many dissolved pollutants, such as SeO4 2-, Cr(IV), NO3-, and perchlorate, from surface waters via reduction, sorption, and assimilation. Isotope fractionation studies can potentially distinguish reduction ...
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(1997)Sequence stratigraphy is a useful tool for reducing cost of exploiting Aux Vases Sandstone resources. Sequence stratigraphy can be used in delineating areas best for hydrocarbons and water recovery, highlighting potential ...
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Now showing items 321-340 of 445