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Title

Relationships between tectonics, slope instability and climate change: Cosmic ray exposure dating of active faults, landslides and glacial surfaces in the SW Alps

Publication Year

2010

Author(s)
  • Sanchez, G.
  • Rolland, Y.
  • Corsini, M.
  • Braucher, R.
  • Bourles, D.
  • Arnold, M.
  • Aumaitre, G.
Source
GEOMORPHOLOGY Volume: 117 Issue: 1-2 Pages: 1-13 Published: 2010
ISSN
0169-555X
Abstract

In the Argentera massif (French Southern Alps), large active landslides develop along strike of an active corridor of dextral strike-slip faults revealed by shallow ongoing seismicity. Glacially polished bedrock outcrops are offset by right-lateral strike-slip faults. Gravitational structures appear to be spatially connected to these active faults. Dating using the in situ-produced (10)Be cosmogenic nuclide performed on glacial, tectonic and gravity surfaces. The late glacial-interglacial Holocene transition is constrained by (10)Be ages between 12 and 15 ka obtained on glacially polished surfaces. The main tectonic activity closely post-dates the main deglaciation event and is constrained by (10)Be ages of 11 and 7-8 ka obtained on fault scarps. Three successive periods of landsliding are recognized, at 11-12, 7-9 and 2.5-5.5 ka. These Holocene ages were obtained on right-lateral strike-slip fault scarps indicating that recent Alpine tectonics are expressed by transcurrent movements. The discussed close age relationship between deglaciation and a tectonic pulse may suggest that post-glacial rebound and enhanced pore water pressure do influence seismogenic tectonic activity. Gravitational destabilizations at 11-12 and 7-9 ka are coincidental with the main tectonic activity, and suggest tectonic shaking as a landslide trigger. The third gravitational destabilization at 2.5-5.5 ka could be attributed either to slope weakness resulting from multiple low-magnitude earthquake events, as currently revealed by the seismic activity or to climatic causes during the wetter optimum climatic period. These early and middle Holocene ages coincide with a phase of large landslide throughout the Alps scale which suggests that these large gravitational mass movements could be related to combined effects of intense tectonic activity and transitions form cold and dry period to warm and wetter phase. (C) 2009 Elsevier B.V. All rights reserved.

Author Keyword(s)
  • Tectonics
  • Landslide
  • Climate changes
  • Cosmic ray exposure dating
  • South-western Alps
KeyWord(s) Plus
  • MASSIF WESTERN ALPS
  • COSMOGENIC NUCLIDES
  • SOUTHERN ALPS
  • ITALIAN ALPS
  • SWISS ALPS
  • FIELD DATA
  • BE-10
  • DEFORMATION
  • ALPINE
  • FRANCE
ESI Discipline(s)
  • Environment/Ecology
  • Geosciences
Web of Science Category(ies)
  • Geography, Physical
  • Geosciences, Multidisciplinary
Adress(es)

[Sanchez, G.; Rolland, Y.; Corsini, M.] Univ Nice Sophia Antipolis, GEOSCIENCE AZUR, UMR 6526, F-06108 Nice, France; [Braucher, R.; Bourles, D.; Aumaitre, G.] Univ Aix Marseille, CNRS, CEREGE, UMR 6635, F-13345 Aix En Provence 04, France; [Arnold, M.] CEA, LSCE, DSM, F-91198 Gif Sur Yvette, France

Reprint Adress

Sanchez, G (reprint author), Univ Nice Sophia Antipolis, GEOSCIENCE AZUR, UMR 6526, 28 Av Valrose,BP 2135, F-06108 Nice, France.

Country(ies)
  • France
CNRS - Adress(es)
  • Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE), UMR6635
  • Géosciences azur (GEOAZUR), UMR6526
  • Laboratoire des sciences du climat et de l'environnement (LSCE), UMR8212
Accession Number
WOS:000276543200001
uid:/Z3M2PBQ4
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