Alpine rock glacier activity over Holocene to modern timescales (western French Alps)
Abstract 10 Be) surface-exposure dating on rock boulder surfaces located along the central flow line of the rock glacier, targeting different longitudinal positions from the headwall to the rock glacier terminus. 0.03 ± 0.02 m a- 1 0.14 ± 0.08 and 0.15 ± 0.05 m a- 1 10 Be surface-exposure ages ranging from 13.10 ± 0.51 to 1.88 ± 0.14 ka. The spatial distribution of dated rock glacier boulders reveals a first-order inverse correlation between 10 Be surface-exposure age and elevation and a positive correlation with horizontal distance to the headwall. These observations support the hypothesis of rock boulders falling from the headwall and remaining on the glacier surface as they are transported down valley, and they may therefore be used to estimate rock glacier surface velocity over geological timescales. Our results also suggest that the rock glacier is characterized by two major phases of activity. The first phase, starting around 12 ka, displays a 10 Be age gradient with a rock glacier surface velocity of about 0.45 m a- 1 - 1 - 1, higher than catchment-integrated denudation rates estimated over millennial timescales. This suggests that the rock glacier system promotes the maintenance of high rock wall erosion by acting as debris conveyor and allowing freshly exposed bedrock surfaces to be affected by erosion processes.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Alpine rock glacier activity over Holocene to modern timescales (western French Alps) ; volume:10 ; number:3 ; year:2022 ; pages:605-633 ; extent:29
Earth surface dynamics ; 10, Heft 3 (2022), 605-633 (gesamt 29)
- Urheber
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Lehmann, Benjamin
Anderson, Robert S.
Bodin, Xavier
Cusicanqui, Diego
Valla, Pierre G.
Carcaillet, Julien
- DOI
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10.5194/esurf-10-605-2022
- URN
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urn:nbn:de:101:1-2022063005233051892310
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:33 MESZ
Datenpartner
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Beteiligte
- Lehmann, Benjamin
- Anderson, Robert S.
- Bodin, Xavier
- Cusicanqui, Diego
- Valla, Pierre G.
- Carcaillet, Julien
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