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<publisher>HAL CCSD</publisher>
<title lang=en>Extreme thinningof the continental crust and mantle exhumationat passive margins. Constraintsfrom the Pyrenean analog</title>
<creator>CLERC, Camille</creator>
<creator>Lagabrielle, Yves</creator>
<creator>Lahfid, Abdeltif</creator>
<creator>Vauchez, Alain</creator>
<creator>Labaume, Pierre</creator>
<creator>Bousquet, Romain</creator>
<contributor>Laboratoire de géologie de l'ENS (LGE) ; École normale supérieure - Paris (ENS Paris) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Systèmes Tectoniques ; 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) - 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>Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)</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>
<description>International audience</description>
<source>24 ème Réunion des sciences de la Terre 2014</source>
<coverage>Pau, France</coverage>
<identifier>insu-01080795</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01080795</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01080795</source>
<source>24 ème Réunion des sciences de la Terre 2014, Oct 2014, Pau, France. pp.227, 2014, 24 ème Réunion des sciences de la terre 2014. Livre des résumés</source>
<language>en</language>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<type>info:eu-repo/semantics/conferenceObject</type>
<type>Conference papers</type>
<description lang=en>We present an overview of the Mid-Cretaceous hyper-extended rift systemexposed in the northern part of the Pyrenean mountain range. Itsinversion during the Pyrenean orogeny allows for precious observationsof the deep-seated processes occurring at the foot of distal margins.Some peculiar aspects characterizing the pre-Alpine hyper-extended domainare examined throughout the 400 km long suture that is fossilizedin the North Pyrenean Zone (NPZ). The high temperature/low pressure(HT/LP) thermal imprint of the extensional event is studied thanksto a dataset of more than hundred peak temperature measurementsby Raman spectroscopy of the carbonaceous material (RSCM). Thepre- and syn-rift metasediments are characterized by an intense, synmetamorphicductile deformation. Focusing on several key-localitiesof the NPZ, we examine the emplacement conditions of the peridotitesin response to this extreme crustal thinning. Geological evidencessuch as the occurrence of peridotite bodies directly underlying metamorphicpre-rift sediments indicate an early attenuation of the rifted continentalcrust. Moreover, syn-rift, Albian-Cenomanian flysch sequenceswere deposited synchronously with the syn-metamorphic ductile deformationof the pre-rift sequences. All along the Internal MetamorphicZone (IMZ), the base of the flysch deposits also recorded the HT tectonicevent. Such a synchronicity between geological events, which aregenerally separated in time, is not common in mountain belts. We examinehow tectonics, metamorphism and sedimentation may be activein a single basin during extension. We propose an original mechanismfor the evolution of the basins involving continuous basal extraction ofthe pre-rift metamorphic sediments. This early HT deformation eventrelates to the « phase anté-Cénomanienne » described by Pyrenean geologistssince 1930.</description>
<date>2014-10-27</date>
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