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<title lang=en>Subduction- and exhumation-related structures preserved in metaserpentinites and associated metasediments from the Nevado-Filabride Complex (Betic Cordillera, SE Spain)</title>
<creator>Jabaloy, Antonio</creator>
<creator>Gomez-Pugnaire, M. T.</creator>
<creator>PADRON NAVARTA, Jose alberto</creator>
<creator>Lopez Sanchez-Vizcaino, Vicente</creator>
<creator>Garrido, C. J.</creator>
<contributor>Departamento de Geodinámica, Universidad de Granada ; Université du Québec</contributor>
<contributor>Departamento De Mineralogía Y Petrología, Facultad De Ciencias, Universidad De Granada ; Université du Québec</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>Manteau et Interfaces ; 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) - 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>Departamento de Geología [Jaén] ; Universidad de Jaén (UJA)</contributor>
<contributor>Instituto Andaluz de Ciencias de la Tierra (IACT) ; Consejo Superior de Investigaciones Científicas [Spain] (CSIC) - Universidad de Granada (UGR)</contributor>
<description>International audience</description>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-01172303</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01172303</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01172303</source>
<source>Tectonophysics, Elsevier, 2015, 644, pp.40-57. 〈10.1016/j.tecto.2014.12.022〉</source>
<identifier>DOI : 10.1016/j.tecto.2014.12.022</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2014.12.022</relation>
<language>en</language>
<subject lang=en>Atg-serpentinite</subject>
<subject lang=en>Chl-harzburgite</subject>
<subject lang=en>Transpressional deformation</subject>
<subject lang=en>Brittle deformations</subject>
<subject lang=en>Betic Chain</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Cerro del Almirez massif (Nevado–Filábride Complex, Betic Cordillera, SE Spain) is composed of antigorite (Atg-) serpentinite and chlorite (Chl-) harzburgite separated by a thin reaction front formed in a palaeo-subduction setting. These ultramafic rocks preserve unique prograde structures related to the pre- and peak high-pressure event (1.6–1.9 GPa and 680–710 °C). The oldest subduction-related structures are preserved in Atg-serpentinites: a penetrative S1 foliation and associated L1 stretching lineation that formed in a non-coaxial regime with a top-to-the-W sense of shear. This planar–linear fabric is crosscut by olivine ± Ti-clinohumite veins, formed during the prograde breakdown of brucite and pre-metamorphic clinopyroxene, which form a system of veins decimetres long. They record embrittlement processes due to the release of 6 vol.% of H2O associated with brucite dehydration. The growth of prograde olivine and/or tremolite porphyroblasts is syn- to post-kinematic in relation to the S1 foliation. Further reactions at higher temperature related to the complete breakdown of the Atg (i.e. Atg-out) are post-kinematic to S1. Prograde Chl-harzburgite is crosscut by sets of conjugate zones associated with grain-size reduction of olivine grains. These grain-size reduction zones are interpreted as brittle structures generated by hydrofracturing due to overpressure fluids in a compressional setting at low-differential stresses.Structures related to the exhumation process are mainly preserved in the metasedimentary host rock, where an S2/L2 planar–linear fabric developed within a shear zone dominated by a non-coaxial regime with a top-to-the-W sense of movement in a transpressional regime. Peak metamorphic conditions deduced for the schists are similar in pressure (1.3–1.9 GPa) but lower in temperature (560–590 °C) compared to the ultramafic rocks in contact with them, suggesting a major shear zone at the base of the ultramafic massif during D2 deformation in a right-handed transpressional regime.</description>
<date>2015-03-16</date>
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