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<title lang=en>Geomorphic Mesozoic and Cenozoic evolution in the Oka-Jombolok region (East Sayan ranges, Siberia)</title>
<creator>Jolivet, Marc</creator>
<creator>Arzhanikov, S.</creator>
<creator>Arzhannikova, A.</creator>
<creator>Chauvet, Alain</creator>
<creator>Vassallo, Riccardo</creator>
<creator>BRAUCHER, Regis</creator>
<contributor>Terre, Temps, Traçage ; Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS) - Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of the Earth Crust, Irkutsk ; Université du Québec</contributor>
<contributor>Bassins ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Dynamique de la Lithosphère (LDL) ; Université Montpellier 2 - Sciences et Techniques (UM2) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Collège de France (CdF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0743-9547</source>
<source>Journal of Southeast Asian earth sciences</source>
<publisher>Elsevier</publisher>
<identifier>insu-00805603</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00805603</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00805603</source>
<source>Journal of Southeast Asian earth sciences, Elsevier, 2013, 62, pp.117-133. 〈10.1016/j.jseaes.2011.09.017〉</source>
<identifier>DOI : 10.1016/j.jseaes.2011.09.017</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jseaes.2011.09.017</relation>
<language>en</language>
<subject lang=en>Apatite fission tracks</subject>
<subject lang=en>Cosmogenic 10Be</subject>
<subject lang=en>Paleogeomorphology</subject>
<subject lang=en>Siberia</subject>
<subject lang=en>India-Asia collision</subject>
<subject lang=en>East Sayan ranges</subject>
<subject lang=en>Baikal Rift System</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<subject>[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The East Sayan ranges are a key area to understand the interactions between the transpressive deformation linked to the far-field effects of the India-Asia collision and the extension linked to the opening of the Baikal Rift System. The active deformation that affects this range is very recent (around 5 Ma) but occurs in a very complex morphotectonic setting and the understanding of the Tertiary deformation relies entirely on a detailed knowledge of the pre-deformation situation. Using apatite fission track thermochronology, cosmogenic 10Be and morphological study on Tertiary lava flows we demonstrate that prior to the Oligocene the morphology of the East Sayan area was characterized by a wide, constantly rejuvenated erosion surface. Apatite fission track thermal modelling indicates that this surface started to form at least in Late Jurassic-Early Cretaceous (140-120 Ma). The long-term exhumation rates (several tens of million years) derived from apatite fission track data (17.5 m/Ma) and the short-term erosion rates (over a few hundred thousand years) derived from cosmogenic 10Be data (12-20 m/Ma) are coherent implying a near constant mean erosion rate since Late Jurassic. This constant, slow erosion prevented the formation of a lateritic-kaolinic weathering crust on the planation surface. By Oligocene-early Miocene times a long wavelength uplift that remains to be explained, induced incision that created shallow valleys later filled by basaltic lava flows. Finally, the present short-wavelength topography initiated during the Pliocene.</description>
<date>2013</date>
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