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(Article of periodic en Anglais - 2014)

Document title

Large-scale rock slope failures in the Eastern Pyrenees : identifying a sparse but significant population in paraglacial and parafluvial contexts

published at : Glacial and paraglacial environments

Authors(s) and Affiliation(s)

JARMAN D. (1) ; CALVET M. (2) ; COROMINAS J. (3) ; DELMAS M. (2) ; GUNNEL Y. (4) ;
(1) Mountain Landform Research, Glasgow, ROYAUME-UNI
(2) CNRS UMR 7194, Univ., Perpignan, FRANCE
(3) Univ. Politècnica de Catalunya, Barcelona, ESPAGNE
(4) Univ. Lumière-Lyon 2, CNRS UMR 5600, Lyon, FRANCE

Abstract

Large-scale rock slope failures (RSFs) are particularly found in 3 topographic settings in the Eastern Pyrenees : at cirque and trough-head thresholds (transition zones of elevated instability between cirque and main glaciated trough walls); near the upper or outer periphery of the ice field, where glacial adaptation of fluvial valleys is incomplete; and in fluvial valleys beyond glacial limits where incision is locally intense. RSF is absent from the range divide, from within cirques, and from most main valleys. In the montane areas, RSF is strongly associated with vestiges of preglacial summit surfaces, confirming that plateau ridges are less stable than sharpened crests and horns. RSF is contributing significantly to the progressive destruction of this paleic relief. The overall sparsity of RSF indicates insufficient rock mass stresses, including rebound after concentrated bedrock erosion. This may reflect a relatively weak imprint of glacial erosion, in a context of relatively low mean rates of neotectonic uplift, possibly signalling overall that eastern Pyrenees landscapes are close to dynamic equilibrium

Source

Thematical fascicle

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

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

Millesime : 2014, vol. 96, no 3 [pp. 357-391]

Bibliographic references : 4 p.

Collation : fig., tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12060

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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