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GEOREF RECORD

Exhumation of subcontinental mantle rocks; evidence from ultramafic-bearing clastic deposits nearby the Lherz peridotite body, French Pyrenees

Camille Clerc, Yves Lagabrielle, Martin Neumaier, Jean-Yves Reynaud and Michel de Saint Blanquat
Exhumation of subcontinental mantle rocks; evidence from ultramafic-bearing clastic deposits nearby the Lherz peridotite body, French Pyrenees
Bulletin de la Societe Geologique de France (October 2012) 183 (5): 443-459

Abstract

In the eastern Pyrenees, the lherzolites always outcrop as restricted bodies scattered across Mesozoic sedimentary units along the North Pyrenean fault. In this article, we focus on the sedimentary processes associated with the tectonic exhumation of the mantle rocks during the Lower Cretaceous and we provide a new detailed analysis of the ultramafic-bearing sedimentary sequences associated with the Lherz body. The Lherz body, 1.5 km long only, belongs to a series of ultramafic bodies of restricted size (a few m to some hundred of m), occurring within sedimentary formations composed mostly of carbonate breccias originating from the reworking of Mesozoic platform limestones and dolomites. The carbonate clasts include marbles displaying different evolutions in relation with the Cretaceous thermal metamorphic event. The clastic formations also include numerous layers of polymictic breccias reworking ultramafic clasts. These layers are found far from any peridotitic body, implying that ultramafic clasts have been transported far away from their sources by sedimentary processes after their disaggregation on the seafloor. In addition, clasts of ultramafic-rich breccias and sandstones are also observed which indicates rapid sedimentation and diagenesis within a tectonically active environment. We discuss the significance of these deposits and their bearing on our understanding of the tectono-sedimentary processes associated with mantle exhumation in a context of development of narrow intracontinental basins suffering extreme crustal thinning.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 183
Serial Issue: 5
Title: Exhumation of subcontinental mantle rocks; evidence from ultramafic-bearing clastic deposits nearby the Lherz peridotite body, French Pyrenees
Affiliation: Ecole Normale Superieure, Laboratoire de Geologie, Paris, France
Pages: 443-459
Published: 201210
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
References: 63
Accession Number: 2013-002512
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., sects., 4 plates, geol. sketch maps
N42°45'00" - N43°15'00", E01°10'00" - E01°30'00"
Secondary Affiliation: Universite de Montpellier 2, FRA, FranceMuseum National d'Histoire Naturelle, FRA, FranceUniversite Paul Sabatier, 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: 201302
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