The Ereendavaa Range (north-eastern Mongolia): an additional argument for Mesozoic extension throughout eastern Asia |
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| Authors: | Yannick Daoudene Denis Gapais Patrick Ledru Alain Cocherie Sébastien Hocquet Tatiana V Donskaya |
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| Institution: | 1.Géosciences Rennes,Université de Rennes 1, UMR 6118 CNRS,Rennes Cedex,France;2.AREVA/NC, Business Unit Mines,Paris la Défense,France;3.BRGM, 3 avenue Claude-Guillemin,Orléans Cedex 2,France;4.Siberian Division of Russian Academy of Sciences,Institute of the Earth’s Crust,Irkutsk,Russia |
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| Abstract: | Mesozoic rift basins locally bounding metamorphic core complexes have been recognized in Transbaikalia and northern China.
Numerous basement outcrops located between these two regions, in eastern Mongolia, are considered as pre-Palaeozoic in age.
One of these, the Ereendavaa Range, appears as a gneissic core marked by amphibolite-facies metamorphic conditions. The range
is overlain to the NW by the unmetamorphosed Mesozoic Onon Basin. Below the basin, the upper part of the range consists of
a gently NW-dipping shear zone associated with top-to-the-NW motion. The structural pattern is consistent with syn-extensional
exhumation of the range. Preliminary geochronological data indicate that the shear zone is late Jurassic to early Cretaceous
in age, coeval with the Onon Basin. These new data from eastern Mongolia constitute a link between Transbaikalia and northern
China, indicating that NW–SE extensional Mesozoic tectonics occurred throughout the entire region. |
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