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Browsing ELibrary by Title
Now showing items 5640-5659 of 20047
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(2004)The study of the mechanical consequences of shorterm pulse- and shock-type impacts on geological media related to human activity (explosions) and tectonic processes (earthquakes) is one of the priority fields in modern ...
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(2003)We report infrared spectroscopic observations of the incorporation of CO2 into pyrophyllite that has been heated between 200ºC and 1250ºC for periods of 15 min, 1 h and 5 days. The presence of CO2 is characterized by the ...
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(2002)Oxidation-reduction processes within natural systems greatly influence the properties of sediments, soils and clays. The objective of this experimental study was to gather new evidence for the effects of changes in redox ...
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(2001)The regional infrazonal scale for the Upper Bathonian - Lower Callovian is elaborated on the basis of successive ammonite assemblages in some Middle Jurassic sections of Central Russia. Four zones and 13 biohorizons, most ...
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(2001)Petrological arguments show that regionally developed low- to medium-pressure, high-temperature granulite facies metamorphism may critically enhance the lowering of crustal density with depth. This leads to gravitational ...
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(2003)Comparison of initial Pb-isotope signatures of several early Archaean (3.65–3.82 Ga) lithologies (orthogneisses and metasediments) and minerals (feldspar and galena) documents the existence of substantial isotopic heterogeneity ...
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(1996)The occurrence of inherited radiogenic Pb components in 35 Ma old magmatic titanite is reported here for the first time. The about 810 Ma age of the inherited components is identical to that contained in zircon from the ...
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(1997)Following Shiraki and Brantley (1995), who found different growth mechanisms for calcite crystal growth at 100°C and 100 bars total pressure, we investigated the inhibition of calcite crystal growth by Mg2+ under the same ...
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(2003)Zircons from the Simmern H5 chondrite and Pomozdino eucrite have been analyzed for their Hf-W isotope systematics. Zircons have high intrinsic Hf contents and coupled with low W, make them ideal Hf-W chronometers. However, ...
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(2004)We report 26 Mg excesses correlated with Al/Mg ratios in five chondrules from the primitive CO3.0 chondrite Yamato 81020 that yield a mean initial 26 Al/27 Al ratio of only (3.8 ± 0.7) * 10-6 , about half that of ordinary ...
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(1999)The alteration mechanism and rate of three aluminosilicate glasses were investigated experimentally in aqueous media between 90 and 200°C. In order to assess their containment properties with regard to minor actinides for ...
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(1999)Data are presented on the Kurga polyphase intrusion, which is located within the Kola alkaline province in the northeastern Baltic Shield. The rock assemblages composing the intrusion are demonstrated to be unique to the ...
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(1997)Mechanisms of sulfide mineral oxidation have been a subject of long-standing interest because of their importance in many industrial, geochemical and environmental processes. Atomic-resolution scanning tunneling microscopy ...
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(2003)Tonga and Mariana forearc peridotites, inferred to represent their respective subarc lithospheres, are compositionally highly depleted (low Fe/Mg) and thus physically buoyant relative to abyssal peridotites representing ...
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INJECTIVE STRUCTURES AND GOLD-SILVER MINERALIZATION OF THE POKROVSK ORE FIELD (AMUR REGION, RUSSIA) (2003)It is shown that the formation of the Pokrovsk ore field structure is related to injective processes that occurred repeatedly in the Umlekan-Ogodzha volcano-plutonic belt during the Late Mesozoic. This is confirmed by the ...
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(1995)The diffusion of the dynamo-generated magnetic field into the electrically conducting inner core of the Earth may provide an explanation for several problematic aspects of long-term geomagnetic field behavior. We present ...
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(2001)This paper reviews recent research focused on the Earth's inner core. Large inner-core traveltime anomalies and the anomalous splitting of core-sensitive free oscillations strongly suggest that the inner core is anisotropic. ...
Now showing items 5640-5659 of 20047