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O. P. Polyansky S. N. Korobeynikov V. G. Sverdlova A. V. Babichev V. V. Reverdatto 《Doklady Earth Sciences》2010,430(2):158-162
Computer simulation of subduction was performed using nonlinear equations of deformable solid mechanics encompassing all types
of nonlinearity: geometric, physical, and contact. This study presents a numerical model of subduction with allowance for
the gabbro-to-eclogite phase transition. The model rheology is a plastic compressible material (Mohr-Coulomb law for a deformed
rock material). It was shown that deep subduction can be modeled well with the selection of appropriate parameters of rock
plasticity providing the initial thickening in the subducting slab nose. 相似文献
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Babichev A. V. Reverdatto V. V. Polyansky O. P. Likhanov I. I. Semenov A. N. 《Doklady Earth Sciences》2019,486(2):706-710
Doklady Earth Sciences - The effect of heat generation due to friction in faults under the conditions of shear and thrust was evaluated by computer modeling, and 3D and 2D thermomechanical... 相似文献
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A. V. Melnikov S. G. Agafonenko I. V. Babichev Yu. G. Piskunov V. G. Moiseenko 《Doklady Earth Sciences》2013,449(2):380-385
The Upper Selemdzha minerogenic zone, which has the potential for noble metal mineralization in the Upper Amur, has been studied. It is confined to the thick strata of Paleozoic terrigeneous-sedimentary rocks (sandstones, siltstones, clay schists, packages of their thin rhythmical interlayering, sedimentary breccias, and conglomerates) in the Tokura subzone of the Selemdzha-Kerbinsk zone in the Amur-Okhotsk area of the Mongol-Okhotsk system, overlain by Early Cretaceous volcanogenic sedimentary rocks and intruded by Early Cretaceous quartz diorites, granodiorites, and dacites. In the Malomyr and Sagur-Semertak ore clusters, there are a few known potential deposits of noble metals and ore occurrences; when studied and prospected, they can exhibit vein-veinlet noble metal mineralization with rich contents of gold and platinoids in ore columns and metasomatic deposits. 相似文献
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A. V. Babichev S. N. Korobeynikov O. P. Polyansky V. V. Reverdatto 《Doklady Earth Sciences》2014,455(1):327-330
The results of numerical mathematical modeling of rock deformations under compression are given. The numerical solutions are obtained using discretization of the equations of the solid mechanics with the finite element method. The model of an ideal elastic-plastic material with a Huber-Mises yield surface was used in the calculations. The layered medium structure is taken into account in modeling of the compression of layers of the lower/middle crust on a local scale. The natural folds in strongly deformed metamorphic sequences were reproduced by the mathematical deformation models. It is shown that folding in the lower part of the Earth’s crust is possible, when the yield stresses of the host rocks are approximately two orders of magnitude less than those of the hard layers. The effect of the boundary conditions and thickness of the compressed rocks on the folding is shown. 相似文献
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Polyansky O. P. Korobeynikov S. N. Babichev A. V. Reverdatto V. V. Sverdlova V. G. 《Doklady Earth Sciences》2009,429(1):1380-1384
A new point of view describing processes of partial melting and development of gravitational instability in a thickening crust
with increased thickness of the granite layer is suggested. Numeral experiments support the following main conclusions. The
critical volume of partially melted material should be formed for the beginning of flotation in a gravitational field. Due
to model estimations, the height of the melting area in the granite crust should be not less than 6–7 km. A mushroom-shaped
form of the floating body was observed in all models regardless of the thermal source size (fixed or variable width): the
high temperature channel (magma leader) and head body of the diapir are formed. The height of diapir floating depends on rheological
features of the surrounding crust: 10 times increase in the yield strength (from 1 to 10 MPa) while temperature decrease confines
the possible level of rising to a depth of 15–16 km. An elevation of about 750 m is formed in the day surface relief above
the axis part of the diapir. 相似文献
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We study a black hole in an expanding Universe during the radiation-dominated stage. In particular, such a black hole may be of the primordial origin. In the case when the black hole radius is much smaller than the cosmological horizon, we found a self-consistent solution for the metric and the matter distribution and its velocity far from the black hole. At distances much smaller than the cosmological horizon our solution coincides with the previously obtained solution for quasi-stationary accretion. Our results can be applied, in particular, for the formation of dark matter density spikes around primordial black holes, and for the evolution of dark matter clumps during the radiation-dominated stage. 相似文献
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