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
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
Fluid inclusions in quartz from uranium mineralization areas of the Litsa ore cluster (Kola Peninsula)
Russian Geology and Geophysics - Tập 58 - Trang 1059-1069 - 2017
T.V. Kaulina, A.A. Avedisyan, A.A. Tomilenko, M.A. Ryabukha, V.L. Il’chenko
Abstract Fluid inclusions in quartz from rocks of different ages and with different uranium contents were studied by microthermometry, gas chromatography, and Raman spectroscopy in three areas with uranium mineralization (Skal’noe, Polyarnoe, and Dikoe) in the Litsa ore district of the Kola Peninsula. The studies have revealed differences in the homo...... hiện toàn bộ
The large earthquake of 27 August 2008 in Lake Baikal and its precursors
Russian Geology and Geophysics - Tập 52 - Trang 405-410 - 2011
R.M. Semenov, O.P. Smekalin
Abstract The large earthquake which shook the southern part of Lake Baikal on August 27, 2008 has received much scientific and public interest. The occurrence of the event in the high-seismicity Baikal rift was not surprising but its origin time was, as usual, unexpected. We discuss the geological conditions of the earthquake, its macroseismic effect...... hiện toàn bộ
Mechanical abrasion of kimberlite indicator minerals: experimental investigations
Russian Geology and Geophysics - Tập 49 - Trang 91-97 - 2008
V.P. Afanas'ev, E.I. Nikolenko, N.S. Tychkov, A.T. Titov, A.V. Tolstov, V.P. Kornilova, N.V. Sobolev
Abstract The relative abrasive stability of kimberlite indicator minerals such as pyrope, picroilmenite, olivine, and apatite as well as diamonds and kimberlite fragments was studied experimentally, and the following sequence of mineral abrasive stability was established: pyrope–olivine–picroilmenite–apatite–kimberlite fragments. Diamond did not virt...... hiện toàn bộ
History of anticlinal traps and oil and gas fields in Jurassic reservoirs in the northern West Siberian basin
Russian Geology and Geophysics - Tập 58 - Trang 384-392 - 2017
N.V. Pervukhina, G.G. Shemin, V.I. Moskvin
Abstract The paper presents new paleotectonic data on the Bovanenkovo, Taz, and Gubkin dome-shaped uplifts and the Novyi Port, Urengoi, Kharampur, and Medvezh’e swells, with implications for the history of zone J2 and the Jurassic reservoir as a whole. Most of the large uplifts originated in the Early–Middle Jurassic and completed their evolution in ...... hiện toàn bộ
Mineral and geochemical compositions, regularities of distribution, and specific formation of ore mineralization of the Rogovik gold–silver deposit (northeastern Russia)
Russian Geology and Geophysics - Tập 56 - Trang 1367-1383 - 2015
R.G. Kravtsova, A.S. Makshakov, L.A. Pavlova
Abstract New data on the mineral composition and the first data on the geochemical composition of ores of the Rogovik gold–silver deposit (Omsukchan ore district, northeastern Russia) have been obtained. Study of the regularities of the spatial distribution of ore mineralization shows that the deposit ores formed in two stages. Epithermal Au–Ag ores ...... hiện toàn bộ
Multiple growth events in diamonds with cloudy microinclusions from the Mir kimberlite pipe: evidence from the systematics of optically active defects
Russian Geology and Geophysics - Tập 56 - Trang 330-343 - 2015
S.Yu. Skuzovatov, D.A. Zedgenizov, A.L. Rakevich, V.S. Shatsky, E.F. Martynovich
Abstract We present new data on the main and additional optically active defects in diamonds with cloudy microinclusions from the Mir kimberlite pipe. It has been found that reshaping might have occurred either in a closed system with nitrogen and hydrogen depletion or owing to new portions of a diamond-forming fluid/melt. The internal structure and ...... hiện toàn bộ
Thermodynamic model of formation of carbonates and uranium mineral phases in lakes Namshi-Nur and Tsagan-Tyrm (Cisbaikalia)
Russian Geology and Geophysics - Tập 59 - Trang 374-385 - 2018
V.D. Strakhovenko, O.L. Gas’kova
Abstract The Tazheran lakes are located compactly in the small Tazheran steppe area. Their bottom sediments are predominantly various calcite–dolomite carbonates, and their waters are rich in uranium. The studies have shown that the main process in these lakes is chemogenic carbonate precipitation with the participation of carbon dioxide formed throu...... hiện toàn bộ
Physicochemical conditions of ore formation in the Samolazovskoe gold deposit (Central Aldan)
Russian Geology and Geophysics - Tập 58 - Trang 1518-1529 - 2017
I.D. Borisenko, A.A. Borovikov, A.S. Borisenko, I.V. Gas’kov
Abstract Using modern thermobarogeochemical methods (thermo- and cryometry, Raman spectroscopy, and LA–ICP-MS), we studied fluid inclusions in quartz from ores formed at the quartz–fluorite, pyrite–chalcopyrite, pyrite–molybdenite, and polysulfide stages of evolution of the Samolazovskoe gold deposit. We have established the fluid regime of the ore f...... hiện toàn bộ
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