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Dating bedrock gorge incision in the French Western Alps (Ecrins-Pelvoux massif) using cosmogenic 10Be

Abstract : We report in-situ produced 10Be data from the Gorge du Diable (French Western Alps) to date and quantify bedrock gorge incision into a glacial hanging valley. We sampled gorge sidewalls and the active channel bed to derive both long-term and present-day incision rates. 10Be ages of sidewall profiles reveal rapid incision through the late Holocene (ca 5 ka) at rates ranging from 6.5 to 13 mm yr−1. Present-day incision rates are significantly lower and vary from 0.5 to 3 mm yr−1 within the gorge. Our data imply either delayed initiation of gorge incision after final ice retreat from internal Alpine valleys at ca 12 ka, or post-glacial surface reburial of the gorge. Our results suggest that fluvial incision rates >1 cm yr−1 into crystalline bedrock may be encountered in transient landscape features induced by glacial-interglacial transitions.
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Submitted on : Wednesday, December 22, 2010 - 6:12:07 PM
Last modification on : Tuesday, April 5, 2022 - 4:33:34 PM

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Pierre G. Valla, Peter van Der Beek, Julien Carcaillet. Dating bedrock gorge incision in the French Western Alps (Ecrins-Pelvoux massif) using cosmogenic 10Be. Terra Nova, Wiley-Blackwell, 2010, 22, pp.18-25. ⟨10.1111/j.1365-3121.2009.00911.x⟩. ⟨insu-00549845⟩

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