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<publisher>HAL CCSD</publisher>
<title lang=en>Lawsonite metasomatism and trace element recycling in subduction zones</title>
<creator>Brovarone, A. vitale</creator>
<creator>Alard, Olivier</creator>
<creator>Beyssac, O.</creator>
<creator>Martin, L.</creator>
<creator>Picatto, M.</creator>
<contributor>Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC) ; Institut de recherche pour le développement [IRD] : UR206 - Centre National de la Recherche Scientifique (CNRS) - Muséum National d'Histoire Naturelle (MNHN) - Université Pierre et Marie Curie - Paris 6 (UPMC)</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>The University of Western Australia (UWA)</contributor>
<contributor>Università degli studi di Torino (UNITO)</contributor>
<contributor>Labex Matisse </contributor>
<description>International audience</description>
<source>ISSN: 0263-4929</source>
<source>EISSN: 1525-1314</source>
<source>Journal of Metamorphic Geology</source>
<publisher>Wiley-Blackwell</publisher>
<identifier>hal-01107395</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01107395</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01107395</source>
<source>Journal of Metamorphic Geology, Wiley-Blackwell, 2014, 32 (5), pp.489-514. 〈10.1111/jmg.12074〉</source>
<identifier>DOI : 10.1111/jmg.12074</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1111/jmg.12074</relation>
<language>en</language>
<subject lang=en>HP fluid-rock interaction</subject>
<subject lang=en>lawsonite</subject>
<subject lang=en>lawsonite-eclogite</subject>
<subject lang=en>lawsonite metasomatism</subject>
<subject lang=en>trace element recycling</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Although lawsonite-bearing rocks are rare in exhumed high-pressure (HP) terranes, they are considered to exert a primary role in subduction dynamics. Recent observations in natural settings have shown that fluid–rock interaction at HP conditions, including metasomatism, may lead to unusually high lawsonite amounts even in rocks that originally contained little or no lawsonite. This process may therefore bear important implications for element recycling in subduction zones. A detailed characterization of the geochemical fingerprints associated with lawsonite metasomatism is presented in this contribution. The studied rocks belong to the HP terranes of Alpine Corsica (France), which is the largest documented exposure for lawsonite metasomatism. Metasomatic lawsonite displays complex compositional zoning, including high trace element, Cr and Ti content. The trace element content is much higher compared with the average of non-metasomatic lawsonite, and is in line with the re-incorporation of large amounts of trace elements (e.g. REE, Sr, Pb, Th) in the rock during metasomatism, as shown by mass transfer calculations. Our data suggest that serpentinites represented the main fluid source for the metasomatism, with concurrent contribution of other, possibly Ca-rich lithologies, such as mafic or meta-sedimentary rocks. We propose that the breakdown of metasomatic lawsonite may contribute to the genesis of magmas and their characteristic geochemical signatures.</description>
<date>2014-06</date>
<contributor>ANR-11-IDEX-0004-02/10-LABX-0067, MATISSE, MATerials, InterfaceS, Surfaces, Environment(2011)</contributor>
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