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Trikhunkov Ya. I. Bachmanov D. M. Gaidalenok O. V. Marinin A. V. Sokolov S. A. 《Geotectonics》2019,53(4):517-532
Geotectonics - The recent evolution of the marginal segment of the Northwestern Caucasus orogen at its junction with the Kerch–Taman periclinal trough has been studied. Geomorphological... 相似文献
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L. M. Rastsvetaev A. V. Marinin T. Yu. Tveritinova 《Izvestiya Physics of the Solid Earth》2010,46(5):394-403
This work describes the most general results of investigations of fault structures of various ranks in the Russian part of
the West Caucasus. The investigations were based on the methods of structural-paragenetic analysis and were aimed at the determination
of acting stress fields, as well as at the revealing and mapping of fault systems and zones of concentration of deformations
of various geological-kinematic types. Structural parageneses of tectonic fractures and faults, most characteristic of the
Russian part of the West Caucasus, are established. 相似文献
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A thick olistostrome strata of late Paleocene-early Eocene age is outlined in the northern flank of the Northwestern Caucasus
folded structure in the Ubinka river valley, which shows the significant role of earlier Cenozoic tectonic movements in forming
the alpine structure of the region. The largest part of the strata is composed of dark weakly calcareous clays, which were
earlier recognized as Lower Cretaceous deposits. Olistoliths and large olistoplaques are mostly of light calcareous rocks
in which microfauna of Cenomanian and Maastrichtian ages were discovered in dark clays. A poor series of foraminifers was
recognized in the dark clays hosting these olistoliths; this series do not enable one to determine with certainty the age
of the strata (of approximately the late Paleocene-early Eocene). Small structural forms were recognized in olistoliths and
olistoplaques, which are not traced in the matrix, this indicates that a series of folded and fissured structures were formed
before these olistoliths and olistoplaques appeared in the olistostrome strata. 相似文献
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Geotectonics - The results of using a technology for zoning hazardous faults developed at the Institute of Physics of the Earth based on natural stress data are presented. The source of these data... 相似文献
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A sequence of clays and clayey siltstones with olistostrome horizons and olistoplaques of the Upper Cretaceous rocks occur in the coastal section northwest of the mouth of the Agoi River. The rocks of this sequence are mostly gray sandy calcareous clays with rare interlayers of siltstones. The horizons and lenses of olistostromes contain small clasts, large blocks, and olistoplaques of rocks of various ages. The microfauna from matrix and clasts of olistostromes of different horizons of the sequence was sampled and identified. The large blocks and olistoplaques are tectonized with formation of slickensides and cracks, which do not travel beyond the country rocks. The thickness of the sequence is 280 m. 相似文献
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We present the results of tectonophysical reconstruction of natural stresses of the Earth's crust in the Altai–Sayan mountain region using cataclastic analysis of fault slips and seismic data on the focal mechanisms of earthquakes. This method allows one to obtain the parameters of the total stress tensor by invoking additional data: generalized experimental data on the brittle fracture of rocks, seismic data on the released stress of strong earthquakes, and data on the topography and density of rocks. Results of the tectonophysical reconstruction of stresses showed significant inhomogeneity of the stress state, which is manifested not only in the variation of the strike and dip of the principal axes of the stress tensor, determining changes in the geodynamic regime of the Earth's crust, but also in the close location of the regions of high and low isotropic tectonic pressure in relation to the lithostatic pressure. The variance of the ratio of tectonic pressure to lithostatic pressure is in the range of 0.59–1.31, with an average value for the region close to unity. This paper discusses internal or external mechanisms capable of generating the stress field obtained by the tectonophysical reconstruction. 相似文献
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The results of field structural studies of the Tuapse shear zone in the Northwest Caucasus are presented. This zone is characterized by shear displacements of various scales with a dominant horizontal shear, viz., a geodynamic type of the stress state, which leads to the formation of faults with mostly lateral displacement of wings, i.e., along the strike of the fault surface. The quantitative characteristics of the local stress conditions in the shear zone (the positions of principal axes and the Lode–Nadai coefficient) are determined on the basis of cataclastic analysis and geological indicators of the paleostresses. The differences between these characteristics are considered for the large tectonic zones. Significant spatial (areal) variations in orientations of the axes of major normal stresses in the shear zone and their local weak gentle variations are evidence of a consistent general stress direction during the formation of faults during the Late Eocene–Miocene deformation epoch. 相似文献