Russian Geology and Geophysics

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Depth differentiation of the Middle Ordovician graptolite and trilobite complexes of Gorny Altai
Russian Geology and Geophysics - Tập 58 - Trang 711-726 - 2017
N.V. Sennikov, A.V. Timokhin, E.V. Lykova
Abstract A biostratigraphic analysis of the Middle Ordovician reference sections of northeastern Gorny Altai is carried out. We study complexes of pelagic graptolites and benthic trilobites from the Dapingian–Darriwilian Tuloi and Karasu Formations. For the first time for the Late Paleozoic sedimentary basins of Siberia, lithofacies and biofacies ana...... hiện toàn bộ
Vertical zoning of oil and gas formation: historico-genetic aspects
Russian Geology and Geophysics - Tập 50 - Trang 327-333 - 2009
A.F. Safronov
Abstract Considerable variations in depth zoning of dispersed organic matter (DOM) catagenesis are caused by various physical and geological factors. The evolution of a sedimentary basin (SB) implies successive changes in organization levels of this system. In the process of evolution the system structure is determined by the interaction of its subsy...... hiện toàn bộ
Change in the viscosity of kimberlite and basaltic magmas during their origin and evolution (prediction)
Russian Geology and Geophysics - Tập 56 - Trang 885-892 - 2015
E.S. Persikov, P.G. Bukhtiyarov, A.G. Sokol
Abstract Based on the analysis of experimental data on the viscosity of mafic to ultramafic magmatic melts with the use of our structure–chemical model for the calculation and prediction of the viscosity of magmas, we have first predicted that diamond-carryihg kimberlite magma must ascend from mantle to crust with considerable acceleration. The visco...... hiện toàn bộ
Reconstructions of long-term ground surface heat flux changes from deep-borehole temperature data
Russian Geology and Geophysics - Tập 55 - Trang 1471-1475 - 2014
D.Yu. Demezhko, A.A. Gornostaeva
Abstract Based on analysis of geothermal data from the Ural superdeep borehole (SG-4) and Onega parametric borehole, the first reconstructions of ground surface heat flux changes for the last 40 kyr have been made. The increase in heat flux during the Pleistocene–Holocene warming (20–10 ka) proceeded ~ 2 kyr earlier than the growth in surface tempera...... hiện toàn bộ
Quality of chrysotile asbestos and high-temperature conductance of the host ultramafics: possible linkage
Russian Geology and Geophysics - Tập 48 - Trang 857-862 - 2007
V.V. Bakhterev
Abstract The paper reports physical, physicochemical, and mineralogical-petrographic studies of serpentinite samples from the Bazhenovo deposit of chrysotile asbestos. The samples differ in mineralogy, physical and physicochemical parameters, and in quality (fiber tenacity) of the hosted chrysotile asbestos. The experiments allowed estimating the tem...... hiện toàn bộ
Ta Nang gold deposit in the black shales of Central Vietnam
Russian Geology and Geophysics - Tập 56 - Trang 1414-1427 - 2015
Tran Tuan Anh, I.V. Gaskov, Tran Trong Hoa, A.S. Borisenko, A.E. Izokh, Pham Thi Dung, Vu Hoang Li, Nguyen Thi Mai
Abstract The Ta Nang gold deposit is localized in Middle Jurassic black shales. The ore zone is a series of layer-by-layer crush zones and zones of hydrothermal rock alteration, ≤10 m in thickness and >2 km in length. It consists of quartz–sulfide veins, sulfidized black shales, and their hydrothermally altered varieties. Sulfide mineralizatio...... hiện toàn bộ
Relationship of the seismic activity of the Tuvinian and adjacent Mongolian areas with the fractal dimensionality of a fault system
Russian Geology and Geophysics - Tập 48 - Trang 593-597 - 2007
O.D. Ayunova, Yu.A. Kalush, V.M. Loginov
Abstract Using GIS technologies, we carried out a complex spatial analysis of the seismic activity and fractal dimensionality of fault fields in the Tuvinian and adjacent Mongolian areas. Results obtained showed that seismic activity is intrinsic to zones with the low fractal dimensionalities (1.2–1.4) of fault systems.
Fracture in heterogeneous materials: experimental and theoretical studies
Russian Geology and Geophysics - Tập 58 - Trang 738-743 - 2017
V.S. Kuksenko, Kh.F. Makhmudov
Abstract The kinetics of fracture in stressed heterogeneous materials is investigated in a differentiated way using the parameter Δt, the interval between single or multiple (cooperative) microfracture events recorded by acoustic emission (AE) responses. The patterns of fracture nucleation and growth, which is a statistic process, are controlled by t...... hiện toàn bộ
Genesis of scapolite from granulites (lower-crustal xenoliths from the Pamir diatremes): results of study of melt inclusions
Russian Geology and Geophysics - Tập 52 - Trang 1319-1333 - 2011
I.A. Madyukov, V.P. Chupin, D.V. Kuzmin
Abstract The results of mineralogical and thermobarogeochemical studies of lower-crustal xenolith of scapolite-bearing granulites from the fergusite-porphyry diatremes pipes in Southeastern Pamir (Tajikistan) are presented. All minerals (including garnet, clinopyroxene, and scapolite) of these granulites contain primary melt inclusions, which were st...... hiện toàn bộ
Evaluation of present-day deformations in the Amurian Plate and its surroundings, based on GPS data
Russian Geology and Geophysics - Tập 57 - Trang 1626-1634 - 2016
S.V. Ashurkov, V.A. San’kov, M.A. Serov, P.Yu. Luk’yanov, N.N. Grib, G.S. Bordonskii, M.G. Dembelov
Abstract We analyze recent crustal movements, based on data of GPS measurements on the Amurian Plate and its margins. Most of the velocities were borrowed from scientific publications. Also, our new and updated data of periodic and permanent GPS observations are presented. A continuous field of strain rates has been constructed using the combined fie...... hiện toàn bộ
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