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Browsing Геология России by Title
Now showing items 2575-2594 of 39195
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(2002)The chemical evolution of seawater during the Phanerozoic is still a matter of debate. We have assembled and critically analyzed the available data for the composition of fluid inclusions in marine halite and for the ...
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(2004)Using a database on the geochemical stratigraphy of the Permian-Triassic lava sequence of the Siberian platform, we analyzed the space-time distribution of various basalt types. Two adjacent stages of magmatic activity ...
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(2001)Chemical interactions between seawater and the oceanic crust have been widely investigated during recent years. However, most of these studies concern the uppermost volcanic part of the crust. The contribution of the ...
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(2001)Carbonado, a polycrystalline variety of diamond, is characterized by unusual carbon isotope compositions with bulk δ13C values clustered tightly between −23 and −30‰ (relative to PDB). These values are significantly lighter ...
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(1999)Interactions of trace metals with sulfide in anoxic environments are important in determining their chemical form and potential toxicity to organisms. In recent years, a considerable body of observational data has accumulated ...
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(1990)The aging of the hydrothermal plume over the Endeavour segment of the Juan de Fuca Ridge was estimated by measuring the222Rn3He ratio in the plume as it dispersed. Despite uncertainties in the source function of hydrothermal ...
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(2003)To study compositional trends associated with open-system thermal metamorphism and shock-induced collisional breakup of L4-6 chondrite parent(s), we used inductively coupled plasma mass spectrometry and radiochemical neutron ...
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(2004)To study compositional trends associated with open and closed system metamorphism and/or shock-induced heating of the L4-6 chondrite parent(s), we used ICPMS and RNAA to quantify 51 trace elements in 48 chemically ...
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(1989)The authors have investigated the potential of chemical surveys of the atmosphere from aircraft for purposes of geological applications and have developed a theory of such surveys. The anomalous methane and radon concentration ...
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(2004)The specific features of natural systems inspire certain optimism, since they represent heterogeneous multisystems with a great number of phase and the respective phase boundaries. This implies that the so-called nonautonomous ...
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(2004)Peridotite xenoliths in a Miocene picrite tuff from the Vitim volcanic province east of Lake Baikal, Siberia, are samples of the off-craton lithospheric mantle that span a depth range from the spinel to garnet facies in a ...
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(2003)How has the Earth maintained a habitable environment while its closest neighbors, Venus and Mars, are currently too hot or too cold? This fortunate state has been attributed to a negative feedback hypothesis that has stood ...
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(2003)Factors controlling chemical weathering in granitic environments are deduced using an extensive database from the literature. Based on a transition state theory model, we evaluated the effects on chemical weathering of ...
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(1997)The use of strontium isotopes to evaluate mineral weathering and identify sources of base cations in catchment waters requires an understanding of the behavior of Sr in the soil environment as a function of time. Our ...
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(1989)We present data that shed some light on the role of chemical weathering in the erosion of traprock in the Subarctic. This rock type was chosen with a purpose, namely for two reasons: first, all known copper-nickel deposits ...
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(2000)There has been considerable controversy concerning the role of chem-ical weathering in the regulation of the atmospheric partial pressure of carbon dioxide, and thus the strength of the greenhouse effect and global climate. ...
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Уральский государственный горный университет», 2019)Relevance of the work. Chromitites of nodular texture are found in all chromite-bearing alpine type ultramafite massifs of the world. The question of the geological and thermodynamic conditions of their formation still ...
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(2004)Understanding the hydrology of cold seep environments is crucial to perform accurate estimates of fluid and chemical fluxes at sedimentary wedges. Shallow convection processes may affect fluid flux estimates and could favor ...
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(2001)A set of time-series experiments was performed in which CaCO3 was precipitated (25°C, 1 atm) from aliquots of an NaHCO3 (0.330 M)/CaCl2 (0.0023 M) solution in a closed system to evaluate the effect of phase transformation ...
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(1990)Besides its theoretical significance, this study is also of practical economic value, since it results in a quantitative determination of the contribution made by sulfates of different origins, which is extremely important ...
Now showing items 2575-2594 of 39195