Dating faulted alluvial fans with cosmogenic 10Be in the Gurvan Bogd mountain range (Gobi-Altay, Mongolia): climatic and tectonic implications - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Terra Nova Année : 2005

Dating faulted alluvial fans with cosmogenic 10Be in the Gurvan Bogd mountain range (Gobi-Altay, Mongolia): climatic and tectonic implications

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Résumé

The Gurvan Bogd mountain range is a fault system characterized by strong earthquakes (M ∼ 8) separated by long periods of quiescence. Further to the previous works in the area, our study provides new data concerning the tectonic and climatic processes in the Gobi-Altay. To quantify the slip rates along the faults, we dated offset alluvial fans analysing the in situ produced 10Be along profiles at depth. The slip rates along the Bogd strike–slip fault and its associated thrust faults over the Upper Pleistocene–Holocene period are 0.95 ± 0.29 mm yr−1 and comprised between 0.12 ± 0.02 and 0.13 ± 0.02 mm yr−1, respectively. The surfaces ages account for a cyclic formation of the fans over the past ∼360 ka, in correlation with the terminations of the marine isotope stages 2, 6, 8 and 10.

Dates et versions

hal-03763382 , version 1 (29-08-2022)

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Riccardo Vassallo, Jean-Francois Ritz, Regis Braucher, Sebastien Carretier. Dating faulted alluvial fans with cosmogenic 10Be in the Gurvan Bogd mountain range (Gobi-Altay, Mongolia): climatic and tectonic implications. Terra Nova, 2005, 17 (3), pp.278-285. ⟨10.1111/j.1365-3121.2005.00612.x⟩. ⟨hal-03763382⟩
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