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Segmental closure of the Mongol-Okhotsk Ocean:insight from detrital geochronology in the East Transbaikalia Basin

Geoscience Frontiers 2022年第1期13卷 15-27页

作者： Anastasia V.Arzhannikova elena i.demonterova Marc Jolivet Ekaterina A.Mikheeva Alexei V.ivanov Sergey G.Arzhannikov Valentin B.Khubanov Vadim S.Kamenetsky institute of the Earth’s Crust Russian Academy of SciencesSiberian BranchIrkutskRussia Laboratoire Géosciences Rennes CNRS-UMR6118Universitéde RennesRennesFrance Geological institute Russian Academy of SciencesSiberian BranchUlan-UdeRussia

The Late Paleozoic–Early Mesozoic Mongol-Okhotsk Ocean extended between the Siberian and Amur–North China *** timing and modalities of the oceanic closure are widely *** is largely accepted that the ocean closed in a scissor-like manner from southwest to northeast(in modern coordinates),though the timing of this process remains *** studies have shown that both western(West Transbaikalia)and eastern(Dzhagda)parts of the ocean closed almost simultaneously at the Early–Middle Jurassic ***,little information on the key central part of the oceanic suture zone is *** performed U-Pb(LA-iCP-MS)dating of detrital zircon from wellcharacterized stratigraphic sections of the central part of the Mongol-Okhotsk suture *** include the initial marine and final continental sequences of the East Transbaikalia Basin,deposited on the northern Argun-idemeg terrane *** provide new stratigraphic ages for the marine and continental *** revised chronostratigraphy allows assigning an age of~165–155 Ma,to the collisionrelated flexure of the northern Argun-idemeg terrane and the development of a peripheral foreland *** collisional process took place 5 to10 million years later than in the western and eastern parts of the *** demonstrate that the northern Argun-idemeg terrane was the last block to collide with the Siberian continent,challenging the widely supported scissor-like model of closure of the MongolOkhotsk *** segments of the ocean closed independently,depending on the initial shape of the paleo continental margins.

关键词： Detrital zircon U-Pb geochronology Mongol-Okhotsk collision East Transbaikalian Basin

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Age and Geochemical Characteristics of Major Mafic Dyke Swarms in the Southern Part of the Siberian Craton

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 125-126页

作者： Tatiana V.DONSKAYA Dmitry P.GLADKOCHUB Richard E.ERNST Sergei A.PiSAREVSKY Anatoliy M.MAZUKABZOV Ulf SODERLUND Michael T.D.WiNGATE Michael A.HAMiLTON elena i.demonterova institute of the Earth’s Crust Siberian Branch of the Russian Academy of Sciences Department of Earth Sciences Carleton University Faculty of Geology and Geography Tomsk State University Australian Research Council Centre of Excellence for Core to Crust Fluid Systems(CCFS)and the institute for Geoscience Research(TiGe R) Department of Applied GeologyCurtin University School of Earth and Environment University of Western Australia GeoB iosphere Science Centre Department of GeologyUniversity of Lund Geological Survey of Western Australia Department of Earth Sciences University of Toronto

Several generations of mafic dyke swarms of different ages and geochemical characteristics cut Precambrian rocks of the southern part of the Siberian craton(irkutsk Promontory).Each generation of dykes is related to a

关键词： Age and Geochemical Characteristics of Major Mafic Dyke Swarms in the Southern Part of the Siberian Craton ppm

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Mafic, Ultramafic and Carbonatitic Dykes in the Southern Siberian Craton with Age of ca 1 Ga: Remnants of a New Large igneous Province?

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 9-页

作者： elena i.demonterova Alexei V.iVANOV Valentina B.SAVELYEVA institute of the Earth's Crust Siberian Branch of the Russian Academy of Sciences

Virtual absence of igneous complexes with ages between1.8 Ga and 0.8 Ga in southern part of the Siberian Craton allowed to Galdkochub et al.(2010)to formulate a hypothesis of long magmatic *** reliable

关键词： area Ultramafic and Carbonatitic Dykes in the Southern Siberian Craton with Age of ca 1 Ga Mafic Remnants of a New Large igneous Province

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