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A. B. Kotov A. A. Sorokin E. B. Sal’nikova A. P. Sorokin A. M. Larin S. D. Velikoslavinskii T. V. Belyakov I. V. Anisimova S. Z. Yakovleva 《Doklady Earth Sciences》2009,429(2):1457-1461
U-Pb geochronological results confirm the Mesozoic age (124 ± 1 Ma) of the Beket granitoid complex, previously interpreted
as being one of the markers amongst the Early Proterozoic magmatic complexes within the Amur superterrane (microcontinent)
of the Central Asian Fold Belt. This implies that the structural and metamorphic amphibolite facies overprints documented
either in the Beket granitoids or Gonzha host rocks are evidently Mesozoic rather than Early Proterozoic in age. 相似文献
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Yu. N. Smirnova A. A. Sorokin A. B. Kotov V. P. Kovach 《Stratigraphy and Geological Correlation》2016,24(3):219-241
This work presents the results of geological, geochemical, and Sm-Nd isotopic and geochemical studies of Late Riphean–Cambrian terrigenous rocks of the Khingan Group of the Lesser Khingan Terrane of the Central Asian Fold Belt, as well as the results of U-Pb geochronological (LA-ICP-MS) studies of detrital zircons from these deposits. These deposits are the most ancient in the structure of the terrain. It was found that the deposits of Iginchi and underlying Murandavi formations are attributed to the Late Riphean–Vendian age interval, and the Kimkan sequence, to the Late Cambrian–Early Ordovician. The periods of formation of the Murandavi and Iginchi formations, on one hand, and the Kimkan sequence, on the other hand, are separated by the stage of granitoid magmatism at the turn of the Vendian–Cambrian. Because of this, they cannot be attributed to a unified sedimentary sequence. It is the most probable that the sedimentation of the Iginchi and Murandavi formations and the Kimkan sequence occurred under subduction conditions against the backdrop of magmatic activity. 相似文献
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The layer forming the Earth’s solid cover is considered to be a uniformly cooling mantle body of low viscosity involved in the convection process. Its cooling is accompanied by the formation of Rayleigh–Benard cells transformed into primary blocks. Their dimensions and dynamics in the subsequent evolution of the Earth’s lithosphere were repeatedly disturbed by superglobal geodynamic cycles involving changes in the area and dynamics of the blocks, some of which were partially absorbed by the mantle, while others were generated for the first time up to the current state. The variably ranked lithosphere blocks transformed into linear dimensions were arranged in a logical series of lithosphere destruction: from convection of the cooling Earth and initial block divisibility of the protolithosphere to its recent plate tectonics and intensive variably ranked fragmentation and fracturing of the plates under the conditions of solid body fragmentation. Convection in the mantle is a genetic endogenic source of the first protolithosphere divisibility. Megablock and subsequent lithosphere divisibility are consistent with the process of crushing of a solid body. 相似文献
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The character of changes in the mollusk fauna in the Late Pleistocene and Holocene sediments within the Bulgarian, Northwestern, Crimean, and Kerch segments of the Black Sea shelf has been examined. A bed containing fossil remains of brackish-water and marine mollusks was recognized in these sediments; the bed accumulated, based on results of radiocarbon datings, 500–1000 years ago. The obtained data do not support the existing notion of a catastrophic fill-up of the Black Sea Basin by marine Mediterranean water [19]. 相似文献
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A. A. Sorokin Yu. N. Smirnova L. I. Popeko A. P. Sorokin Yu. V. Smirnov 《Doklady Earth Sciences》2010,435(1):1431-1434
This article contains the first data on the chemical composition and tectonic conditions of deposition of Paleozoic terrigenous
sediments of the Ols’doi Terrain located in the eastern portion of the Central Asian Fold Belt. The data obtained suggest
that at the initial stage deposition of sediments took place in the environment of a passive continental margin, while at
the final stage it occurred in the environment of an island arc or an active continental margin. Based on all geological data
available, the change of the geodynamic settings corresponds to the time of the formation of the Norovlya margin-continental
magmatic arc. 相似文献
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Minerals of native elements (Pd, Pt, Au, Ag, and Au-Ag solid solutions) as well as Pb, Zn, Cu, Bi, Fe, Cr, Ni, W, Al, and
their intermetallides, and a number of other ore minerals were discovered in brown coals of the Erkovets field. The structural
reorganization of the noble metal grains and most of the other minerals found in the brown coals suggest their authigenic
paragenesis. The input of noble metals in brown coals is possible in an ionic mode from the surface and underground waters
as mineral particles transported by wind from goldfields. 相似文献