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71.
Pavlova L. M. Shumilova L. P. Radomskaya V. I. Sorokin A. P. Ivanov V. V. 《Doklady Earth Sciences》2019,488(2):1178-1181
Doklady Earth Sciences - Data on the species and strain specificity of micromycetes in the processes of toxic elements extraction from multicomponent solutions are obtained as results of modal... 相似文献
72.
It is shown that ionosphere heating by DC electric field leads to instability of acoustic-gravity waves and to the formation of solitary internal gravity vortex structures. These dipole type vortices with characteristic transverse size of the order of several kilometers are propagated in the lower ionosphere with subsonic velocity. The threshold values of the electric field needed to suppress the wave damping caused by the interaction of induced current with the geomagnetic field and to provide the vortex generation are found. The considered physical mechanism is applicable to the generation of internal gravity vortices and related ionospheric disturbances when the ionosphere is influenced by the electric field of seismic origin exceeding the threshold value. 相似文献
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Doklady Earth Sciences - 相似文献
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New data on geochemical features of the Lower Paleozoic terrigenous rocks in the Mamyn terrane (eastern Central Asian Fold Belt) and U–Pb geochronological studies of the detrital zircon from these rocks are presented. The obtained results suggest the following conclusions. 1. At present, the Kosmataya sequence includes different age Lower Cambrian terrigenous–carbonate and Lower Ordovician terrigenous rocks or represents Lower Ordovician olistostromes including limestone blocks with the Lower Cambrian fauna. Lower Ordovician terrigenous rocks were formed in an island arc or active continental margin, mainly, owing to the erosion of Cambrian–Early Ordovician plutons and volcanics that are widespread in structures of the Mamyn terrane and weakly reworked by the chemical weathering. 2. The Silurian Mamyn Formation was developed at a passive continental margin. The main sources of clastic material for this formation were the same Cambrian–Early Ordovician igneous rocks as for the Cambrian sequence, with the participation of Early Silurian and Vendian igneous complexes. The obtained data significantly refine concepts about the geological structure of the Mamyn terrane, which is a member of the Argun Superterrane, one of the largest tectonic structures in the eastern Central Asian Fold Belt. 相似文献
76.
A. A. Chashchin A. A. Sorokin V. A. Lebedev M. G. Blokhin 《Russian Journal of Pacific Geology》2016,10(4):239-248
This paper presents new mineralogical, petrographic, geochemical, and isotope–geochronological data on the Cenozoic basaltic trachyandesites from the Udurchukan volcanic area (Amur region), which occupies the watersheds of the Uril, Mutnaya, and Khingan rivers. Based on the available geochrolonological data and new K–Ar dating, the basaltic trachyandesites are middle Miocene in age (18.9–17.1 Ma). Petrogeochemically, they are divided into two groups. These groups differ in the contents of MgO, TiO2, P2O5, as well as Sr, Ba, Nb, Ta, and LREE, which is presumably related to the different degrees of metasomatic reworking of the mantle sources and their melting. In terms of the trace-element distribution and ratios, the basaltic trachyandesites from the Udurchukan area are close to the within-plate rocks and were contributed by enriched lithospheric mantle previously subjected to fluid metasomatism. 相似文献
77.
A. A. Sorokin A. B. Kotov Yu. N. Smirnova E. B. Sal’nikova Yu. V. Plotkina S. Z. Yakovleva 《Doklady Earth Sciences》2016,471(1):1126-1130
The results of investigations of gneissose hornblende granitoids, which intrude terrigenous deposits of the Murandav Formation of the Khingan Group and which were deformed together with them due to later structural transformations, are given. It is shown that by their geochemical properties these granitoids are comparable with granitoids of type I and are 535 ± 6 Ma old (U?Pb method on zircons). The obtained data indicate that dikes of hornblende granites, which intrude terrigenous rocks of the Murandav Formation of the Khingan Group and are deformed together with them, were embedded at the Cambrian and Ediacaran transition. The assumption that terrigenous deposits of the Khingan Group (at least the Murandav and underlying Igincha formations) were accumulated in the Neoproterozoic is supported. 相似文献
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I.V. Buchko A.A. Sorokin V.A. Ponomarchuk A.E. Izokh 《Russian Geology and Geophysics》2012,53(7):636-648
The Lukinda dunite–troctolite–gabbro massif in the Selenga–Stanovoy superterrane on the southeastern framing of the Siberian Platform was earlier considered Precambrian. The performed 40Ar/39Ar dating of the massif plagioclase yielded an Early Permian age (285 ± 7.5 Ma). The main specific petrochemical features of the intrusion rocks during their crystallization differentiation are an increase in SiO2 and CaO contents and a decrease in FeOtot content, with TiO2 content remaining low and showing minor variations. A specific geochemical feature of the Lukinda massif ultrabasite–basites is a slight domination of LREE over HREE, with (La/Yb)N= 1.0–8.2. The depletion of the massif rocks in LILE (except for Sr and Ba), REE, and HFSE suggests that the massif formed on an active continental margin. 相似文献