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<title lang=en>Very high geothermal gradient during mantle exhumation recorded in mylonitic marbles and carbonate breccias from a Mesozoic Pyrenean palaeomargin (Lherz area, North Pyrenean Zone, France)</title>
<creator>Lagabrielle, Yves</creator>
<creator>Clerc, Camille</creator>
<creator>Vauchez, Alain</creator>
<creator>Lahfid, Abdeltif</creator>
<creator>Labaume, Pierre</creator>
<creator>Azambre, Bernard</creator>
<creator>Fourcade, Serge</creator>
<creator>Dautria, Jean-Marie</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>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>
<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>Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)</contributor>
<contributor>Institut des Sciences de la Terre de Paris (iSTeP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - 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-01285079</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01285079</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01285079/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01285079/file/1-s2.0-S1631071315002060-main.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01285079</source>
<source>Comptes Rendus Géoscience, Elsevier Masson, 2016, From rifting to mountain building: the Pyrenean Belt, 348 (3-4), pp.290-300. 〈10.1016/j.crte.2015.11.004〉</source>
<identifier>DOI : 10.1016/j.crte.2015.11.004</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.crte.2015.11.004</relation>
<language>en</language>
<subject lang=en> Sedimentary breccias</subject>
<subject lang=en>Mantle exhumation</subject>
<subject lang=en> Aulus basin</subject>
<subject lang=en> Lherz peridotites</subject>
<subject lang=en> Mylonitic marbles</subject>
<subject>[SDU] Sciences of the Universe [physics]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Although they are famous among Earth scientists, the Lherz peridotites are exposed within geological formations of the North Pyrenean Zone (NPZ) still lacking detailed investigations. Our study focuses on the metasediments of the Aulus basin hosting the Lherz peridotite body and associated ultramafic fragments of smaller size. The new data set comprises of structural analysis and detailed geological mapping of the massive Mesozoic marbles that form the prerift sequence typical of the NPZ and of the ultramafic-rich clastic breccia formations surrounding the peridotite bodies. The massive marbles display an evolution from hot and ductile to cold and brittle deformation, indicative of an exhumation process ending with the sedimentary reworking of both the deformed Mesozoic metasediments and the exhumed ultramafic rocks. Crystal Preferred Orientations (CPO) measured in the marbles support a deformation mechanism by dislocation creep of calcite, which is dominant between 400 8C and 600 8C; these deformation temperatures are within the range determined earlier by Clerc et al. (2015), using RSCM (Raman Spectroscopy of Carbonaceous Material) geothermometry. As a consequence, we better describe the transition from ductile to brittle deformation in the prerift marbles and clarify the origin of the syn-rift breccias. Due to continuous exhumation along detachments' faults, the brecciated metamorphic carbonates of the prerift NPZ sedimentary cover were passively uplifted towards shallower levels and progressively unroofed, while transported passively on the back of the exhumed ultramafic footwall. These results are consistent with the recent interpretations of the North Pyrenean peridotites as remnants of subcontinental mantle rocks exhumed within the pre-Pyrenean rift system. We emphasize the importance of tectonic decoupling between the Mesozoic sedimentary cover and the Palaeozoic basement, which leads to the juxtaposition of metamorphosed and deformed Mesozoic Please cite this article in press as: Lagabrielle Y, et al. Very high geothermal gradient during mantle exhumation recorded in mylonitic marbles and carbonate breccias from a Mesozoic Pyrenean palaeomargin (Lherz area, North Pyrenean Zone, France). C. R. Geoscience (2016), http://dx.</description>
<rights>http://creativecommons.org/licenses/by-nc-nd/</rights>
<date>2016</date>
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