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Browsing ELibrary by Title
Now showing items 3795-3814 of 21934
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(1998)The solubility and weathering reactions of ettringite, (Ca6Al2(SO4)3(OH)12#26H2O), were used to study the geochemical equilibria of the Ca(OH)2-Al2(SO4)3-H2O system at environmental pH conditions. Ettringite is a stable ...
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(2004)Our numerous findings of euclase in aporhyolite of the entire Al'kesvozh sequence, and gravelstones of the Tel'pos Formation clearly indicate that the Maldy rhyolites that greisenized in the Early Cambrian (?) served as a ...
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(2004)Idiomorphic crystals (up to 3.5 mm) of ferroan platinum, cooperite and mertieite-II were found in a heavy-mineral concentrate from stream sediments of the Darya river in the Aldan Shield, Russia. Pt-Fe crystals display ...
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(2001)The finding of Euramerian articulates represented by vegetative and generative organs of bowmaniteans and calamostacheans in Carboniferous deposits of the Kuznetsk Basin indicates a short warming episode in the Alykaevskii ...
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(2003)New geophysical data have become available from shipborne and satellite measurements allowing a re-evaluation of the largely unknown junction of the Arctic spreading centre and the northeastern Siberian continental margin ...
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(1989)The authors investigated scheelite by the X-ray luminescence and electron paramagnetic resonance (EPR) methods. The spectra of about 200 specimens from 45 deposits of various types, including gold, copper-molybdenum, ...
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(2006)We measured the 153Eu/151Eu ratio by MC-ICP-MS for a terrestrial basalt, two terrestrial soils, and four meteorites (whole rocks and/or chondrules of Bjurb?le, Forest City, Murchison, and Allende) and found no isotopic ...
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(2001)Eurypterid (Eurypterida, Chelicerata) palaeoecology is reviewed, in light of a statistical analysis of 74 Silurian and Early Devonian eurypterid assemblages. Kjellesvig-Waering's three eurypterid 'biofacies' model is ...
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(1996)The mantle plume model has been used to explain a variety of geological and geodynamic events. For instance, a large plume, or 'superplume', under the Pacific basin has been proposed to account for a number of Cretaceous ...
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(1996)The unstable sea-level position in the Cambrian-Ordovician boundary interval resulted in several consequent eustatic minima. Among them, the Lange Ranch (the base of the proavus Zone),Acerocare (the base of the Tremadocian, ...
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(2002)We reconstruct and correlate palaeoclimatic events and deposits from shelf, glacial, periglacial, and extraglacial zones of northern Eurasia over the last 600,000 years. The chronostratigraphical correlation of identified ...
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(1998)A transgressive-regressive (T-R) curve for the Jurassic and Lower Neocomian of the West-Siberian sedimentary basin was constructed on a detailed chronostratigraphic basis. This curve is compared with the quantitative ...
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(2001)Textures formed during crystallization of the eutectic composition in the system Orthoclase-Quartz-H2O at 500 MPa and 50, 100, and 200 degreesC undercooling have been studied experimentally and simulated using a two-dimensional ...
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(2001)A γ-radiation dose rate is defined for the Kara-Balty Industrial Complex, which is located in the Kyrgyz Republic (formerly part of the Soviet Republic). The increased γ-radiation doses are being monitored at tailings areas ...
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(2003)Statistical methods for comparing travel time residuals are reviewed and the importance of using a statistic that is both robust and a measure of dispersion is demonstrated. Results from relocations based on travel times ...
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(2003)The association of platyceratid gastropods and crinoids is preserved in the fossil record of the Ordovician through the Permian. The association has been generally interpreted as involving coprophagy, although recent ...
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(1990)Determining the maximum temperature to which sedimentary rocks were exposed is of great importance, especially in petroleum geology, and also is one of the most difficult of tasks in that science. A simple method of ...
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(2003)Numerous studies have demonstrated the potential usefulness of river hydraulic data obtained from satellites in developing general approaches to tracking floods and changes in river discharge from space. Few studies, ...
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(2002)The degrees of thermal metamorphism of 10 CM chondrites and of the Allende CV3 chondrite were evaluated from the viewpoint of ''graphitization'' of the carbonaceous macromolecular matter by means of flash pyrolysis-gas ...
Now showing items 3795-3814 of 21934