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<publisher>HAL CCSD</publisher>
<title lang=en>B-11-rich fluids in subduction zones: The role of antigorite dehydration in subducting slabs and boron isotope heterogeneity in the mantle</title>
<creator>Harvey, Jason</creator>
<creator>Garrido, C. J.</creator>
<creator>Savov, Ivan</creator>
<creator>Agostini, Samuele</creator>
<creator>PADRON NAVARTA, Jose alberto</creator>
<creator>Marchesi, Claudio</creator>
<creator>Lopez Sanchez-Vizcaino, Vicente</creator>
<creator>Gomez-Pugnaire, M. T.</creator>
<contributor>School of Earth and Environment [Leeds] (SEE) ; University of Leeds</contributor>
<contributor>Instituto Andaluz de Ciencias de la Tierra (IACT) ; Universidad de Granada (UGR) - Consejo Superior de Investigaciones Científicas [Spain] (CSIC)</contributor>
<contributor>Istituto di Geoscienze e Georisorse–CNR, Pisa</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>Departamento De Mineralogía Y Petrología, Facultad De Ciencias, Universidad De Granada ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 0009-2541</source>
<source>Chemical Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-01172276</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01172276</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01172276</source>
<source>Chemical Geology, Elsevier, 2014, 376, pp.20-30. 〈10.1016/j.chemgeo.2014.03.015〉</source>
<identifier>DOI : 10.1016/j.chemgeo.2014.03.015</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2014.03.015</relation>
<language>en</language>
<subject lang=en>Boron</subject>
<subject lang=en>Isotopes</subject>
<subject lang=en>Subduction</subject>
<subject lang=en>Antigorite dehydration</subject>
<subject lang=en>Island arc volcanics</subject>
<subject lang=en>Serpentinite</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>Serpentinites form by hydration of mantle peridotite and constitute the largest potential reservoir of fluid-mobile elements entering subduction zones. Isotope ratios of one such element, boron, distinguish fluid contributions from crustal versus serpentinite sources. Despite 85% of boron hosted within abyssal peridotite being lost at the onset of subduction at the lizardite-to-antigorite transition, a sufficient cargo of boron to account for the composition of island arc magma is retained (c. 7 μg g− 1, with a δ11B of + 22‰) until the down-going slab reaches the antigorite-out isograd. At this point a 11B-rich fluid, capable of providing the distinctive δ11B signature of island arc basalts, is released. Beyond the uniquely preserved antigorite-out isograd in serpentinites from Cerro del Almirez, Betic Cordillera, Spain, the prograde lithologies (antigorite–chlorite–orthopyroxene–olivine serpentinite, granofels-texture chlorite-harzburgite and spinifex-texture chlorite-harzburgite) have very different boron isotope signatures (δ11B = − 3 to + 6‰), but with no significant difference in boron concentration compared to the antigorite-serpentinite on the low P–T side of the isograd. 11B-rich fluid, which at least partly equilibrated with pelagic sediments, is implicated in the composition of these prograde lithologies, which dehydrated under open-system conditions. Serpentinite-hosted boron lost during the early stages of dehydration is readily incorporated into forearc peridotite. This, in turn, may be dragged to sub-arc depths as a result of subduction erosion and incorporated in a mélange comprising forearc serpentinite, altered oceanic crust and pelagic sediment. At the antigorite-out isograd it dehydrates, thus potentially providing an additional source of 11B-rich fluids.</description>
<date>2014-05-29</date>
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