Pliocene to Quaternary deformation in South East Sayan (Siberia): Initiation of the Tertiary compressive phase in the southern termination of the Baikal Rift System |
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| Authors: | A Arzhannikova S Arzhannikov M Jolivet R Vassallo A Chauvet |
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| Institution: | 1. Geological Faculty, Moscow State University, Moscow, Russia;2. Centre for Earth Evolution and Dynamics, CEED, Department of Geosciences, University of Oslo, Norway;3. Rosnedra, MNR, Moscow, Russia;4. Rosneft, Moscow, Russia;1. Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia;2. Institute of Natural Resources, Ecology and Cryology, Siberian Branch of the Russian Academy of Sciences, ul. Butina 26, Chita, 672090, Russia;3. Tomsk Filial of the A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademicheskii 4, 634055, Russia;4. National Research Tomsk Polytechnical University, pr. Lenina 30, Tomsk, 634050, Russia |
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| Abstract: | The South East Sayan area, W of the Lake Baikal is subjected to a very complex tectonic setting where the extensional stress field of the Baikal Rift System meets the compressional stress field generated by the India–Asia collision further south. Using satellite images, aerial photographs, SRTM DEM, field mapping of geomorphological structures, and published neotectonics and geological data we show that most of the relief in the SE Sayan initiated during Late Pliocene–Pleistocene through compressive reactivation of inherited structures. By Late Quaternary, clockwise rotation of the compressive field generated strike–slip faulting and local, secondary extension still within a general compressional stress field. We demonstrate that the formation of the small-scale extensional basins within the East Sayan range is not linked to general the extension in the Baikal Rift System nor to a possible asthenospheric plume acting at the base of the crust but rather to the rotation of small rigid tectonic blocks driven by the compression. |
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