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(Article of periodic en Anglais - 2013)

Document title

Evidencing a large body of ice in a rock glacier, Vanoise Massif, Northern French Alps

Authors(s) and Affiliation(s)

MONNIER S. (1 2) ; CAMERLYNCK C. (3) ; REJIBA F. (3) ; KINNARD C. (1) ; GALIBERT P.-Y. (3) ;
(1) Centro de Estudios Avanzados en Zonas Áridas (CEAZA), La Serena, CHILI
(2) UMR 8591, CNRS - Univ. Panthéon-Sorbonne (Paris 1), Meudon, FRANCE
(3) UMR 7619 Sisyphe, Univ. Pierre et Marie Curie - Paris 6, Paris, FRANCE

Abstract

The Sachette rock glacier is an active rock glacier located between 2 660 and 2 480 m a.s.l. in the Vanoise Massif. In order to characterize its status as permafrost feature, shallow ground temperatures were monitored and the surface velocity measured by photogrammetry. The rock glacier exhibits near-surface thermal regimes suggesting permafrost occurrence and also displays significant surface horizontal displacements. In order to investigate its internal structure, a ground-penetrating radar (GPR) survey was performed. The results point towards the existence of a large buried body of ice in the upper part of the rock glacier. The rock glacier was interpreted to result from the former advance and decay of a glacier onto pre-existing deposits, and from subsequent creep of the whole assemblage. This study of the Sachette rock glacier thus highlights the rock glacier as a transitional landform involving the incorporation and preservation of glacier ice in permafrost environments with subsequent evolution arising from periglacial processes

Source

Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2013, vol. 95, no2 [pp. 109-123]

Bibliographic references : 2 p.

Collation : 11 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12004

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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