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Browsing Геология России by Title
Now showing items 3295-3314 of 39126
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(2004)The possible existence of a positron radiation belt in the inner magnetosphere of the Earth, its space localization, flux and energy distribution and the ratio of e+/e- flux are considered. We suggest for the positron ...
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(2000)Excesses and deficiencies in 182W in meteorites and lunar samples relative to the terrestrial 182W atomic abundance have been assigned to the decay of 182Hf (t1/2=9 Ma) and have been used to date metal-silicate fractionation ...
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(1996)The density of the Earth's core (32.5% of the mass of the Earth) is about 8% less than that of pure metallic Fe under similar P, T conditions, requiring the presence of a substantial amount of a light element or light ...
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(2002)Since the mid-1980s, cosmogenic 10Be, with a 1.5 Myr half-life, has proven to be an extremely useful tool for studies of the solid Earth and surface processes. Measured at very low concentrations ...
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(1996)Calcium is a major target element for cosmogenic 36Cl production. Consequently 36Cl rapidly reaches detectable levels in minerals such as calcite and calcium feldspar exposed at the Earth's surface. Spallation of calcium ...
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(1998)At depths below a few metres, 36Cl production in calcite is initiated almost entirely by cosmic ray muons. The principal reactions are (1) direct negative muon capture by Ca; 40Ca(μ-,α)36Cl, and (2) capture by 35Cl of ...
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(2002)The decay of formerly live 182Hf with a half-life of 9 Myr results in variations in the abundance of 182W in early solar system objects. Here we demonstrate that major excesses in 182W in some lunar samples are the results ...
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(2002)Since the mid-1980s, cosmogenic 10Be, with a 1.5 Myr half-life, has proven to be an extremely useful tool for studies of the solid Earth and surface processes. Measured at very low concentrations using a particle accelerator, ...
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(2004)Counts of taxonomic richness and derivates such as origination and extinction rates should ideally be scaled against absolute time. However, calibration of the fossil record with absolute time is often wanting or lacking ...
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(2003)Recent developments in multiple-collector magnetic-sector ICP-MS (inductively coupled plasma-mass spectrometry) have permitted the relative abundances of the two isotopes 63 and 65 of copper to be measured with unprecedented ...
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(2002)138Ce/142Ce and 143Nd/144Nd isotope ratios of lunar samples are determined to constrain the petrogenetic differentiation and evolution of the moon. High-precision Ce-Nd isotope data, well-defined Rb-Sr isochrons, and rare ...
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(1999)Experiments on degassing of water-saturated granite melts with a pressure drop from 100 and 450 MPa to 40 and 120 MPa, respectively, at temperatures close to feldspar liquidus (750–700 °C), were carried out to determine ...
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(2002)We report major-element, trace-element and isotopic data of volcanic rocks from the late-Neoproterozoic (570 Ma) Agardagh Tes-Chem ophiolite in Central Asia, south-west of Lake Baikal (50.5N, 95E). The majority of samples ...
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(2004)We address the gradual transition from brittle failure to cataclastic flow under increasing pressures by a new model, incorporating damage rheology with Biot’s poroelasticity. Deformation of porous rocks is associated with ...
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(2001)An 11-meter-wide alkalic monchiquite dike recovered from the subsurface of Louisiana has produced a metasomatic aureole in the adjacent interbedded carbonate mudstones and siltstones. The asymmetric contact aureole, which ...
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COUPLED INVERSE MODELLING OF GROUNDWATER FLOW AND MASS TRANSPORT AND THE WORTH OF CONCENTRATION DATA (2003)This paper presents the extension of the self-calibrating method to the coupled inverse modelling of groundwater flow and mass transport. The method generates equally likely solutions to the inverse problem that display ...
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(2004)The hypothesis that the soluble fraction of the organic compounds present in carbonaceous chondrite meteorites was formed during aqueous alteration of the parent body was tested with mass-transfer, reaction-path calculations. ...
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(2003)A Landau potential with linear-quadratic coupling has been developed to describe interactions between a non-convergent order parameter, QOD, for Fe/Mg ordering, and the order parameter, QD, for the C2/c-P21/c phase transition ...
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(2014)The well-documented 1883 eruption of Krakatauvolcano (Indonesia) offers an opportunity to couple the erup-tion’s history with the tsunami record. The aim of this paper isnot to re-analyse the scenario for the 1883 eruption ...
Now showing items 3295-3314 of 39126