—In the Middle Ordovician sections of the Eriekhe River basin, which are of crucial importance to correlate the regional stratigraphic units of Northeast Russia and the General Stratigraphic Scale (by graptolites), we identified a diverse ostracod assemblage. The new data substantially supplement the Middle Ordovician paleontology of this region. The analysis of the stratigraphic distribution of these assemblages made it possible to verify the correlation of the Eriekhe Structural Facies Zone (SFZ) suites with regional stratigraphic units of the Northeast Russia and, based on homotypic ostracod assemblages, with the horizons of the Siberian Platform. The joint findings of ostracods and graptolites in the studied section allowed us to correlate the horizons of the Northeast Russia and the Siberian platform with the stages of the General Stratigraphic Scale.

––The paper provides an insight into the geodynamic history of the Northeast Asian terranes during the Paleozoic, focused on the stratigraphic, paleontological, and sedimentological data indicating that the Precambrian structures of early–middle Paleozoic age were originally part of the passive margin of the Siberian paleocontinent. The geological and paleontological data presented in the foregoing studies have shown the inherited geodynamic regime and synchronous sedimentation and magmatism on the passive continental margin and in most terranes before their separation from the Siberian paleocontinent in the late Paleozoic. The revealed significant differences in evolution between the Okhotsk and Omolon and other terranes give grounds to postulate that they rifted off the paleocontinent even earlier.

—The comprehensive chorological analyses of benthic and planktonic faunal groups, the reconstruction of paleogeography, and the delineation and correlation of the same-type biofacies and geographic ranges of the fauna suggest that the Paleozoic tectonic blocks of the Verkhoyansk–Chukotka foldbelt (Tas-Khayakhtakh, Selennyakh, Omulevka, Omolon, Okhotsk, and Chukchi inliers) and Kotel’nyi Island originated in the same epicontinental sea basin of the Siberian paleocontinent, being parts of its passive margin located at the place of the recent foldbelt. We provide a rationale for paleontological, sedimentary, and morphometric diagnostic characteristics of rift zones in complex thrust-folded structures. A rift development, with activation phases in the Ordovician and Devonian, is found to have preceded the break-up of the passive margin in the late Paleozoic.

Complex researches of the pyrite Early Cambrian Kyzyl-Tashtyg deposit (East Tuva) have allowed to reconstruct paleohydrothermal systems, to find out physical and chemical conditions of hydrothermal processes, and also to establish features of existence of ancient hydrothermal biota in the operating zone of the solutions, participating at all stages of formation of ore-bearing structures, since influence of postmagmatic fluids and finishing low temperature hydrotherms. The representative data on biota has been received at studying of the objects, which were in a zone of influence of rather low temperature hydrothermal systems. In one cases findings of microorganisms are dated for basalt complexes, containing ore body, and in other cases the found fauna is connected with ferruginous-siliceous sediments. It has been found out that microorganisms in the tonsil cavities of basalts evolved at the temperatures nearby 110-140°С under the influence of hydrothermal solutions. Much lower temperatures (to 100 °С) existed at development of micro-fossils in the quartz-hematite hydrothermal constructions of Kyzyl-Tashtyg deposit.

The core of the Gaindinskaya-3 reference borehole disclosing a complete section of Ordovician deposits in the basin of the middle reaches of the Podkamennaya Tunguska River has yielded a diverse ostracod assemblage, which supplements the paleontological characteristics of the Upper Ordovician of the Siberian Platform. Three new genera and 14 new species are described; the previously known taxa are provided with photographs. The characteristics of stratigraphic distribution of ostracod assemblages in the section of the core are considered and boundaries between some regional stages and ostracod biozones are revised.

Research Article| April 01, 2015 100th anniversary of the birth of B.S. Sokolov: the role of personality in the history of science A.V. Kanygin; A.V. Kanygin aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, RussiabNovosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia *Corresponding author. E-mail address: KanyginAV@ipgg.sbras.ru (A.V. Kanygin) Search for other works by this author on: GSW Google Scholar A.E. Kontorovich; A.E. Kontorovich aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, RussiabNovosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia Search for other works by this author on: GSW Google Scholar Yu.I. Tesakov Yu.I. Tesakov aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia Search for other works by this author on: GSW Google Scholar Author and Article Information A.V. Kanygin aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, RussiabNovosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia A.E. Kontorovich aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, RussiabNovosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia Yu.I. Tesakov aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia *Corresponding author. E-mail address: KanyginAV@ipgg.sbras.ru (A.V. Kanygin) Publisher: Novovsibirsk State University Received: 23 Jan 2015 Accepted: 29 Jan 2015 First Online: 29 Mar 2021 Online Issn: 1878-030X Print Issn: 1068-7971 © 2015, IGM, Siberian Branch of the RASIGM, Siberian Branch of the RAS Russ. Geol. Geophys. (2015) 56 (4): 503–510. https://doi.org/10.1016/j.rgg.2015.03.002 Article history Received: 23 Jan 2015 Accepted: 29 Jan 2015 First Online: 29 Mar 2021 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A.V. Kanygin, A.E. Kontorovich, Yu.I. Tesakov; 100th anniversary of the birth of B.S. Sokolov: the role of personality in the history of science. Russ. Geol. Geophys. 2015;; 56 (4): 503–510. doi: https://doi.org/10.1016/j.rgg.2015.03.002 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyRussian Geology and Geophysics Search Advanced Search There would be no history without history of personalities. B.S. Sokolov, 2007 Academician B.S. Sokolov was one of the brilliant team of Soviet scientists who propelled Soviet and Russian geology in the post-World War II period to a leading position in the world. He called this period “the golden age” of Soviet geology that involved the heroic efforts of dozens of Soviet scientists from academic, industrial research, and educational institutions in collaboration with production geologists and geophysicists that resulted in the successful implementation of an unprecedented government program for regional geological exploration over the entire territory of the Soviet Union... You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Based on the inventory, revision, and analysis of stratigraphic, paleontological, and lithofacies data on the area of Ordovician deposits in the southern Siberian Platform (Irkut amphitheater), the refined and detailed schemes of biofacies zonation of this paleobasin are substantiated. Schemes of zonation have been compiled for the Nyaian, Ugorian, Kimaian, Mukteian, Volginian, Kirenskian-Kudrinian, Chertovskian, and Baksanian Horizons of the regional Ordovician stratigraphic chart of the Siberian Platform. The schemes present biofacies different in lithologic composition, spread of dominant groups of fauna, and hydrochemical regime (normal-marine salinity, freshwater, or high salinity). It is shown that contrasting changes in paleogeographic environments and the spread of faunal communities under changing environmental conditions were influenced by the transgression-regression cyclicity of the evolution of the Siberian Platform paleobasin and by the proximity of the land. Specific groups of fauna localized in particular facies are described. These groups are regarded as communities that were the first to occupy the littoral zones of epicontinental sea basins in the Ordovician. (C) 2015, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

Ordovician K-bentonite beds have a long history of investigation all around the world. They have been reported from Gondwana, the Argentine Precordillera, the Yangtze Platform, Laurentia, Baltica, and numerous terrains between Gondwana and Baltica, which now constitute a part of Europe. In recent years several K-bentonite beds have also been discovered in the Upper Ordovician of the Siberian Platform. This discovery is significant not only for their value in local and regional chronostratigraphic correlation but also for global geochronology, paleogeography, paleotectonic and paleoclimatic reconstructions. All in all, eight individual K-bentonite beds have been identified in the Baksian, Dolborian and Burian regional stages, which correspond roughly to the Upper Sandbian-Katian Global Stages. Zircon crystals from the uppermost K-bentonite bed within the Baksian regional stage provide a 206Pb/238U age of 450.58 +/- 0.27 Ma. We will present preliminary results of the study of the three lowermost beds from the Baksian Regional Stage and suggest that the Taconic-Enisej (also spelled Yenisei or Yenisey) volcanic arc was continuous along the western margin of Siberia.

The new-generation regional stratigraphic chart of the Siberian Platform was accepted by the Interdepartmental Stratigraphic Committee of Russia in April 2013. Two main supplements to the chart of 1979 were made: (1) the new scale of stages, accepted by the International Commission on Stratigraphy in 2008, was presented for the Ordovician System along with the previous British standard and (2) the nomenclature of the regional stratigraphic units was supplemented by the Mukteian Horizon, which occupies an intermediate position between the Vikhorevian and Volginian Horizons. The first substantiation of the necessity of viewing this stratigraphic interval as an independent horizon was made in 1980, after it had become possible to use well cores for a more precise definition of the paleontologic characteristics and boundaries of the Vikhorevian Horizon, originally detected from several isolated sections in the Irkut amphitheater with an indistinct boundary with the overlying Volginian Horizon. Recent data, particularly those from drilling, permit a more complete paleontological substantiation of the Mukteian Horizon, consideration of its distribution in different structure-facies zones, and correlation of type sections.

Study of Early Cambrian sedimentary-volcanogenic complexes hosting the Kyzyl–Tashtyg pyrite deposit in Eastern Tuva has revealed cyanobacteria and algae that existed in zones of ore-forming hydrothermal systems similar in characteristics to present-day “black smokers” at ocean bottoms. Along with archaeocyaths and Cyanophyta from the host sedimentary rocks and microfossils from basalt amygdules, various cyanobacteria, monocyatheans, and sponge spicules have been found in ferrosiliceous deposits and metasedimentary rocks. Scanning electron microscopic, mineralogical, and thermobarogeochemical studies helped to reconstruct their hydrothermal environment.