Showing papers in "Russian Geology and Geophysics in 2009"

TL;DR: In this article, the authors combine petrological-geochemical and thermomechanical modeling techniques to explain origin of primary magmas of both Maimecha-Kotui meimechites and the Gudchikhinskaya basalts of Norilsk region, which represent, respectively, the end and the beginning of flood magmatism in the Siberian Trap Province.

TL;DR: In this paper, the chemistry of exceptionally rare phlogopite inclusions coexisting with ultramafic (peridotitic) and eclogitic minerals in kimberlite-hosted diamonds of Yakutia, Arkhangelsk, and Venezuela provinces was discussed.

TL;DR: In this paper, the geochemical fingerprints of deep dehydration are compared to those of shallow dehydration from the subducting slabs, and the relation of intraplate volcanism above the stagnant slab and deep dehydration is investigated.

TL;DR: In this paper, the formation of the western margin of the Siberian craton in the Neoproterozoic is considered, with a focus on its transformation from a passive continental margin into an active one, accretion and collision processes, formation of island arcs and ophiolites, orogeny, and continent-marginal rifting.

TL;DR: In this article, the most reliable values of organic matter production and masses in the ocean, the total supply of organic carbon, and the input of terrigenous organic matter with coastal erosion, river runoff, and eolian matter are estimated.

TL;DR: In this paper, a more rigorous approach to paleogeodynamic reconstructions of the Sayan-Baikal folded area proceeding from update views of the origin and evolution of island arcs and back-arc basins is proposed.

TL;DR: Winkler et al. as discussed by the authors used stable isotope data to show that the amount of fluids in the lower crust, under peak metamorphic conditions, was very large indeed, far too important to be only locally derived.

TL;DR: In this paper, the authors studied the petrology of K-alkaline lamproite-carbonatite complexes, which are widespread in Siberia, from a chemical point of view, and their diagnostic properties were described in terms of chemical and mineral composition.

TL;DR: In this paper, a geochemical description of igneous and carbonate rocks in the Tazheran massif of alkalic and nepheline syenites is provided.

TL;DR: In this paper, earthquake-induced soft-sediment deformation (seismites) in reference Quaternary sections of southeastern Altai was studied, where deformation is localized in thin (few centimeters to 0.5-1.0 m) continuously striking and frequently repeated layers sandwiched between undeformed sediments.

TL;DR: The state of the art of the problem of mantle melt transport through the upper mantle beneath spreading zones is reviewed in this article, focusing on the ways of mantle magma transport and mechanisms of the localization of diffuse intergranular porous melt percolation into the channel flow.

TL;DR: In this paper, the concentration barriers of diamond nucleation in the melts with variable proportions of silicates and carbonates have been determined at 8.5 GPa and 7.0 GPa, respectively.

TL;DR: Sulfide inclusions in diamonds, the most common of all inclusions, contain critical evidence about the timing and physical/chemical conditions prevailing during diamond formation as mentioned in this paper, and the bulk composition of the Mss as encapsulated is important for interpretation of diamond petrogenesis (P- versus E-type diamonds) and to the commonly used Re-Os dating technique.

TL;DR: Tectonics and petroleum potential of the underexplored East Arctic area have been investigated as part of an IPY (International Polar Year) project as mentioned in this paper, where the authors investigated the geology and geology of the region.

TL;DR: In this article, it was shown that in completely miscible carbonate-silicate melts oversaturated with dissolved diamond-related carbon, a concentration barrier of diamond nucleation arises at a particular ratio of carbonate and silicate components.

TL;DR: Manganoan ilmenite was identified in Juina, Brazil kimberlitic rocks among other megacrysts as mentioned in this paper, and the chemical composition of Mn-ilmenite is almost stoichiometric for manganite except for an unusually high manganese content.

TL;DR: A probabilistic estimate of the global conventional recoverable oil resource was performed based on the concept of the Earth's sedimentary cover as a holistic system as discussed by the authors, and a forecast for global oil production was made for the period till the end of the 21st century.

TL;DR: The authors studied ferrous paralava, a high-temperature rock, produced by complete fusion of the sedimentary protolith in the Ravat natural coal fire which has been on for over two thousand years.

TL;DR: A comparative analysis of morphology and geochemistry was made for gold from the primary ores and weathering crust of the Suzdal' gold deposit, Eastern Kazakhstan as mentioned in this paper, which is localized in Carboniferous carbonaceous-terrigenous strata and is of gold-sulfide type.

TL;DR: In this article, a set of polynomial equations is proposed for the temperature and pressure dependence of chromium content in garnet and spinel in the assemblage Gar + Opx + Es and Gar + Fo +Opx + Sp.

TL;DR: In this paper, the earliest sialic crust (grey-gneiss complex) is composed of plagiogneisses, their migmatized varieties, and subordinate plagiagranitoids.

TL;DR: In this article, the Neoproterozoic medium-pressure metamorphism of the kyanite-sillimanite type overprinted regionally metamorphosed low-pressure andalusite-bearing rocks at about 850 Ma.

TL;DR: The Olyutorsky-Kamchatka foldbelt formed as a result of two successive collisions of the Achaivayam-Valaginsky and Kronotsky-Commander island arcs with the Eurasian margin where the two terranes docked after a long NW transport.

TL;DR: In this article, the relationship between the petroleum potential of the West Siberian province and the Mesozoic to Cenozoic tectonic processes is analyzed based on structural and isopach maps of seismogeologic megacomplexes compiled from generalized geological and geophysical data on the province at the Trofimuk Institute of Petroleum Geology and Geophysics.

TL;DR: In this paper, the 2D thermal structure of the Central Asian and Pacific tectonic belts and adjacent cratonic areas of Siberia and North China using a synthesis of geothermal data from six geoscience transects covered by seismic, resistivity, and gravity surveys was investigated.

TL;DR: In this article, the results of a study conducted on the Mesozoic-Cenozoic sedimentary cover and Precambrian-Paleozoic platform deposits of the Pre-Yenisei petroleum subprovince were presented.

TL;DR: In this article, a physicochemical model is proposed to predict and calculate the viscosity of magmatic melts and water diffusion as functions of the following parameters: Ptot.; Pfl.; T; melt composition, including volatiles (H2O, OH−, CO2, CO32−, F−, Cl−); cation ratios: Al3+/(Si4+ + Al3+)), Al 3+/(Na+ + K+ + Ca2++ Mg2+ + Fe 2+), Fe2+/(Fe 2++ Fe3

TL;DR: In this article, soft-sediment deformation in Late Pleistocene and Holocene deposits of the northwestern Kola Peninsula (Pechenga River valley) is reported and analyzed in terms of paleoseismicity implications.

TL;DR: In this article, the authors suggest that the diurnal and annual EPEMF periodicity may be associated with differential motion of the core and lithosphere and use this hypothesis to model an annual core path.

TL;DR: In this paper, the authors measured the shear strength of ice specimens and large in situ blocks (σ = 0.2−1.9 MPa) and investigated it as a function of air temperature and ice structure.