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<title lang=en>Deformation associated with mantle exhumation in a distal, hot passive margin environment: New constraints from the Saraillé Massif (Chaînons Béarnais, North-Pyrenean Zone)</title>
<creator>Corre, Benjamin</creator>
<creator>Lagabrielle, Yves</creator>
<creator>Labaume, Pierre</creator>
<creator>Fourcade, Serge</creator>
<creator>Clerc, Camille</creator>
<creator>Ballèvre, Michel</creator>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) ; Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) - Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 1631-0713</source>
<source>Comptes Rendus Géoscience</source>
<publisher>Elsevier Masson</publisher>
<identifier>insu-01265777</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01265777</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01265777/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01265777/file/corre-CRGeosc-2016.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01265777</source>
<source>Comptes Rendus Géoscience, Elsevier Masson, 2016, From rifting to mountain building: the Pyrenean Belt, 348 (3-4), pp.279-289. 〈10.1016/j.crte.2015.11.007〉</source>
<identifier>DOI : 10.1016/j.crte.2015.11.007</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.crte.2015.11.007</relation>
<language>en</language>
<subject lang=en>Chaînons Béarnais</subject>
<subject lang=en>Albian–Cenomanian rifting</subject>
<subject lang=en>Distal passive margin</subject>
<subject lang=en>Mantle exhumation</subject>
<subject lang=en>Ductile deformation</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Chaînons Béarnais ranges (North-Pyrenean Zone, west-central Pyrenees) display a fold-and-thrust structure involving the Mesozoic sedimentary cover, decoupled from its substratum at the Keuper evaporites level and associated with a few peridotite bodies and scarce Palaeozoic basement lenses. In the western part of the Chaînons Béarnais, the newly described recumbent fold of the Saraillé massif comprises a peridotite body and several lenses of Palaeozoic basement wrapped by the Triassic to Aptian sedimentary cover. This structure represents a remnant of the distal portion of the Pyrenean paleo-rifted margin where mantle rocks have been exhumed during Albian–Cenomanian times. In this paper, we present the first detailed mapping and microstructural analysis of the Saraillé massif, providing new geological basis for reconstructing the evolution of this part of the paleo-margin. Our mapping (i) shows that the pre-rift Mesozoic cover forms a recumbent fold cored by mantle and crustal rocks and (ii) confirms that the prerift cover was detached from its bedrock along a layer of Triassic evaporites and slid onto the exhumed mantle rocks. Sliding of the prerift cover was associated with extreme crustal thinning and mantle exhumation along a major detachment fault, together with intense metasomatism affecting both the continental basement and the sedimentary cover. We show for the first time (1) that the Mesozoic pre-rift sediments experienced syn-metamorphic ductile thinning during mantle exhumation, and (2) that during its extreme attenuation, the continental basement was reduced to tectonic lenses some ten meters thick by ductile shearing.</description>
<date>2016</date>
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