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Évolution tectonique du Tianshan oriental du Néogène à l'actuel

Abstract : The Tianshan range is a 2000-km-long tectonically active mountain range. The Tianshan plays a major role in the India-Asia collision since it presently accommodates up to 40% of the total convergence between those two continents. Despite this intense deformation, the topography of the range shows series of high elevated range separated by flat intermountain basins. This range is therefore a remarkable case of example to study orogenesis processes and remains a key area to better understand how the deformation related to the India collision has been distributed through the Asian continent. Enhanced aridity since Pleistocene has moreover remarkably preserved alluvial terraces and fans which may have recorded the deformation enabling the quantification of the tectonic rates during the Quaternary period. Therefore, using Terrestrial Cosmogenic Nuclide we have dated several alluvial surfaces and analyzed their deformation using D.E.M. or high resolution DGPS measurements. Hence, in the eastern Tianshan we quantify the quaternary shortening rates across several structures located in the Northern and Southern foreland piedmonts but also within the range in the intermountain Bayanbuluk basin. Moreover, when possible we have also derived the Neogene shortening rates from geometric modeling of syntectonic strata. Our results highlight the recent acceleration of the eastern Tianshan since ~150-200 ka. We also show that a significant proportion (>15%) of the whole deformation is accommodated within the range while the remaining part is distributed between the different thin skin tectonic structure in the piedmonts. This result supports the hypothesis that the range is out of equilibrium and an in-building stage of deformation
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Dimitri Saint-Carlier. Évolution tectonique du Tianshan oriental du Néogène à l'actuel. Sciences de la Terre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0206⟩. ⟨tel-01754466⟩

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