Denudation outpaced by crustal thickening in the eastern Tianshan - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Earth and Planetary Science Letters Year : 2017

Denudation outpaced by crustal thickening in the eastern Tianshan

Stephane Dominguez
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P. Blard
Marc Jolivet
Shengli Wang

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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insu-01610154 , version 1 (28-11-2019)

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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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