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Denudation outpaced by crustal thickening in the eastern Tianshan

Julien Charreau 1, * Dimitri Saint-Carlier 1 Stephane Dominguez 2 Jérôme Lavé 1 P. Blard 1 Jean-Philippe Avouac 3 Marc Jolivet 4 Yan Chen 5, 6 Shengli Wang 7 David. Nathan Brown 3 Luca Claude Malatesta 3 Edward Rhodes 3 
* Corresponding author
6 Géodynamique - UMR7327
BRGM - Bureau de Recherches Géologiques et Minières (BRGM), ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327, INSU - CNRS - Institut national des sciences de l'Univers, UO - Université d'Orléans : UMR7327
Abstract : The modern high topography of the Tianshan resulted from the reactivation of a Paleozoic orogenic belt by the India/Asia collision. Today, the range exhibits tectonically active forelands and intermontane basins. Based on quantitative morphotectonic observations and age constraints derived from cosmogenic 10Be dating, single-grain post-infrared infrared stimulated luminescence (p-IR IRSL) dating and modeling of fault scarp degradation, we quantify the deformation in the Nalati and Bayanbulak intermontane basins in the central Eastern Tianshan. Our results indicate that at least 1.4 mm/yr of horizontal crustal shortening is accommodated within these two basins. This shortening represents over 15% of the 8.5 ± 0.5 mm/yr total shortening rate across the entire range at this longitude. This shortening rate implies that the Eastern Central Tianshan is thickening at a mean rate of ∼1.4 mm/yr, a rate that is significantly higher than the average denudation rate of 0.14 mm/yr derived from our cosmogenic analysis. This discrepancy suggests that the Tianshan range has not yet reached a steady-state topography and remains in a transient state of topographic growth, most likely due to limited denudation rates driven by the arid climate of Central Asia.
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Julien Charreau, Dimitri Saint-Carlier, Stephane Dominguez, Jérôme Lavé, P. Blard, et al.. Denudation outpaced by crustal thickening in the eastern Tianshan. Earth and Planetary Science Letters, 2017, 479, pp.179-191. ⟨10.1016/j.epsl.2017.09.025⟩. ⟨insu-01610154⟩

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