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Paleomagnetic evidence for Siberian plate tectonics from Rodinia through Pangaea to Eurasiaкнига
- Авторы: Metelkin D.V., Kazansky A.Y., Vernikovsky V.A.
- Год издания: 2011
- Место издания: Nova Science Publishers, Inc
- Монография
- Аннотация: The tectonic history of the Siberian continental plate is discussed here at the mainstages of geological chronicle: from Rodinia supercontinent, through Pangeasupercontinent, up to present-day position of Siberia within the structure of Eurasia. Westart from the end of Mesoproterozoic where the Rodinia supercontinent was assembled.The available geological and paleomagnetic data set suggests that at the Meso-Neoproterozoic boundary Siberian craton was a part of Rodinia supercontinentlengthening the Laurentia northward. The reconstruction implies that the southern (inmodern coordinates) margin of Siberia was oriented towards the northern margin of Laurentia. Most likely Siberia represented a giant promontory in the southeast of Rodinia,because during the Late Mesoproterozoic and Early Mesozoic, the western, northern andeastern (in modern coordinates) margins of Siberia represented marginal marine basinsopened to the ocean. New paleomagnetic data show that the Siberia - Laurentiadisintegration during the Neoproterozoic Rodinia break-up has developed progressivelyfrom west to east along the southern (in modern coordinates) margin of the Siberiancraton under the controlling role of strike-slips. During Neoproterozoic on thebackground of the Rodinia break-up in the west of the Siberian craton, a gradualtransformation of passive continental margin into active continental margin occurred witha development of Late Neoproterozoic island arc systems. All of those processes havedetermined the further tectonic stile of Siberian craton during the Late Precambrian.The stage of accretion of the Neoproterozoic island arc to the Siberianpaleocontinent has been going in pre-Vendian, however, even at the end of Vendian the regime of active continental margin was again resumed at least in the southwesternSiberian plate. Vendian to Earliest Paleozoic is the next important step in tectonic history of the Siberian plate. Its connecting to dynamics of development of the island arc systemlies along the south to south-western margin of the Siberian continent. Relicts of theseisland arcs formed the framework of the Caledonian structure of the Central Asia foldbelt and appeared on the Altai-Sayan region (southwestern frame of Siberian craton).Geological and paleomagnetic data prove that the modern mosaic structure of this frameis the result of deformation of a primary stretching island arc system during its obliqueaccretion to the craton under the large-scale strike-slip conditions.Late Paleozoic dynamics of crust deformation of the Siberian plate at the stage ofcollision with Kazakhstan Baltica and Kara continents was most likely controlled by deepfaults inherited from Early Paleozoic structure. At the end of the Paleozoic, strike-slipsmovements of tectonic domains within the structure of Eurasian continental plate havetaken place. This key moment in the tectonic history of Siberia has been manifested bythe dramatic trap eruption well known as the Siberian Large Igneous Province.Paleomagnetic evidence obtained for the Mesozoic of Siberia suggest Mesozoicgeological history of Eurasia to be essentially determined by the strike-slip motions oflarge-scale tectonic domains within its structure. The synthesis of paleomagnetic data onthe Mesozoic of Eurasia justifies a sinistrial strike-slip motion of the assemblage ofSiberian structures relative to the European and North-China ones during the Mesozoic.This process is reflected by the clockwise rotation of the Siberian domain. Thediscrepancy in paleomagnetic pole positions of deferent domains demonstrate thesystematic character and allow to be revealed the scales of strike-slip motions associatedwith this rotation and to propose a new tectonic model describing the history of theclosure of Mongolo-Okhotsk paleoocean. © 2009 by Nova Science Publishers, Inc. All rights reserved.
- Добавил в систему: Казанский Алексей Юрьевич