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Browsing ELibrary by Title
Now showing items 6857-6876 of 21936
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(2004)This work demonstrates that the formation of fluid systems in the consolidated crust of various geological structures is mainly controlled by geothermal conditions, the age, and the character of tectonic processes. Two ...
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(2003)We used neutron activation to characterize the metal of 33 main-group pallasites (PMG), widely held to be samples of a core-mantle interface. Most PMG cluster in a narrow range of metal and silicate compositions, but 6 are ...
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(2003)A special petrochemical type of diamondiferous igneous rocks is distinguished which belongs to the lamproitic branch of alkalic ultramafic rock family and differs from both kimberlites and lamproites. The rocks compose the ...
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(2002)We have characterized complexes of the guide faunal groups (small-shelled fauna, archaeocyathids, trilobites, and brachiopods) and followed their stratigraphic and lateral distribution in the Cambrian deposits of the ...
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(2000)Literature data for major element oxide compositions of most coarse-grained Types A and B inclusions in CV3 chondrites may be in error due to non-representative sampling of spinel relative to other phases because of small ...
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(2002)Variations in the bulk-rock compositions of primary high-Mg melts provide important constraints on the thermal and chemical structure of their mantle source regions. Picrites and komatiites of Archean to Recent age exhibit ...
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MAJOR EPOCHS OF INTRUSIVE MAGMATISM OF KUZNETSK ALATAU, ALTAI, AND KALBA (FROM U-PB ISOTOPE DATES) (2001)We present new U-Pb isotope dates for zircons from intrusive rocks of Kuznetsk Alatau, Gorny Altai, Rudny Altai, and Kalba and generalize the earlier published results of geochronological studies in these regions (U-Pb and ...
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(1983)Linear extensional rift and rift-like structures have been generated many times during various periods of the Earth's history since early times. These structures have varied with time, however, in scale, morphology, ...
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(2002)Current techniques for the quantification of melt inclusion chemistry require that inclusions are compositionally homogeneous and that post-entrapment devitrification or crystallization onto the inclusion walls could be ...
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(2002)Focuses on the importance of light sources in the discipline of mineral micromounting. Sufficiency of a typical high-intensity incandescent table lamp; Factors influencing the production of true color images; Use of a ...
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(2004)A monographic description of mollusks from the Lower Cambrian Bystraya Formation of Eastern Transbaikalia is presented for the first time. The mollusk assemblage includes ten species of nine genera; the following six species ...
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(2004)Maleevite, ideally Ba B-2 Si-2 O-8, and pekovite, ideally Sr B-2 Si-2 O-8, are two new mineral species found in boulders in the moraine of the Dara-i-Pioz glacier, the Alai range, Tien Shan, Garmskii district, northern ...
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(1996)Maleimides (1H-pyrrole-2,5-diones), degradation products of photosynthetic tetrapyrrole pigments, have been found for the first time in the polar fraction of the solvent extracts of two marine sediments deposited in ...
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(1987)The persistent occurrence of diverse forms of manganese crichtonite in kimberlite breccias of the Mir, the Aykhal, the No. 3 and the Dal'nyaya pipes, Yakutia has been proven. The coexisting forms of this mineral detected ...
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(2004)According to Mayo (1932), who provided a brief historical review of the names used for piemontite, the first researcher who described this mineral has been Cronstedt in 1758 who named it “rod Magnesia.” In 1790 Chevalier ...
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(1988)Metallogenesis of manganese in space and time is reviewed here in the light of the progressive development of the atmosphere, the hydrosphere and the lithosphere attendant with the varied styles of tectonism. Economic ...
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(1995)The spores of a marine Bacillus bacterium, strain SG-1, are able to oxidize Mn(II) over a wide range of temperatures (0-80°C) and Mn(II) concentrations (<1 nm to>25 mM), in both low ionic strength N-(2-hydroxyethyl)piper ...
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(1993)Hydrothermal vents provide a major source of dissolved Mn(II) to the oceans, where concentrations range from 5 mM within the 350°C hot smokers to just above ambient seawater concentration in far field vent plumes. The ...
Now showing items 6857-6876 of 21936