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Cretaceous folding in the Devoluy Mountains (Subalpine Chains, France); gravity-driven detachment at the European paleomargin versus compressional event

Andre Michard, Thierry Dumont, Louis Andreani and Nicolas Loget
Cretaceous folding in the Devoluy Mountains (Subalpine Chains, France); gravity-driven detachment at the European paleomargin versus compressional event (in Geodynamics of the France Southeast Basin; importance of gravity tectonics, Xavier Le Pichon (editor) and Claude Rangin (editor))
Bulletin de la Societe Geologique de France (November 2010) 181 (6): 565-581

Abstract

Located in the southern Subalpine Chains, the Devoluy-Bochaine (D-B) area displays an "ante-Senonian" (Turonian) unconformity classically interpreted as the result of a compressional event. We argue that the D-B unconformity results from a major synsedimentary collapse on the slope of the European paleomargin. During the Tithonian-Late Cretaceous interval, the D-B area was located on a steep slope between the European platform (Vercors) and the Vocontian basin of SE France where mass-flows and resedimented deposits accumulated. Under the unconformity, the Devoluy folding affects the Kimmeridgian-Cenomanian series detached on the Mid-Upper Jurassic marl-rich "Terres Noires". Truncation of the top of the collapsed unit resulted from normal faulting and fragmentation of the poorly consolidated sediments and from their erosion by deep sea currents. Neither subaerial deposits nor shallow water conglomerates occur at the unconformity interface, where fault scarp breccias are locally exposed. The subsequent, mostly Coniacian-Maastrichtian onlapping formation ("Calcaires en Lauzes") consists of channelized sandy calci-turbidites where slumping events occur again. To conclude, the Devoluy-Bochaine massifs offer the first example exposed in the External Western Alps of a major synsedimentary collapse comparable to the Niger or Israel offshore study cases.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 181
Serial Issue: 6
Title: Cretaceous folding in the Devoluy Mountains (Subalpine Chains, France); gravity-driven detachment at the European paleomargin versus compressional event
Title: Geodynamics of the France Southeast Basin; importance of gravity tectonics
Author(s): Michard, AndreDumont, ThierryAndreani, LouisLoget, Nicolas
Author(s): Le Pichon, Xaviereditor
Author(s): Rangin, Claudeeditor
Affiliation: 10, rue des Jeuneurs, Paris, France
Affiliation: College de France, Aix en provence, France
Pages: 565-581
Published: 201011
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
References: 87
Accession Number: 2011-012777
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. col., geol. sketch maps
N44°00'00" - N45°00'00", E05°00'00" - E07°00'00"
Secondary Affiliation: Laboratoire de Geodynamique des Chaines Alpines, FRA, FranceCollege de France, FRA, France
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societe Geologique de France. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201108
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