Age of overthrust-type granites in the accretionary?collisional system of the early Caledonides (western Baikal region) |
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| Authors: | E I Mikheev A G Vladimirov V S Fedorovsky T B Bayanova A M Mazukabzov A V Travin N I Volkova S V Khromykh V V Khlestov P A Tishin |
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| Institution: | 1.Sobolev Institute of Geology and Mineralogy, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;2.National Research Tomsk State University,Tomsk,Russia;3.Novosibirsk State University,Novosibirsk,Russia;4.Geological Institute,Russian Academy of Sciences,Moscow,Russia;5.Geological Institute, Kola Science Center,Russian Academy of Sciences,Apatity,Russia;6.Institute of the Earth’s Crust, Siberian Branch,Russian Academy of Sciences,Irkutsk,Russia |
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| Abstract: | The western Baikal region (Ol’khon region, Nutgei zone, Kharikta area) is characterized by the development of packets of thrust-type folds and synkinematic granites corresponding to the stage of thrust deformations (overthrust-type granites). Two stages in the formation of thrust-type folds separated by episodes of granite emplacement are definable. The data obtained make it possible to estimate both the time of transition from thrust to strike-slip deformations and the duration of accretionary?collisional events that resulted in regional strike-slip deformations, which terminated in the western Baikal region 460?455 Ma ago. |
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