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<datestamp>2018-01-11</datestamp>
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<title lang=en>A Late Oligocene Suprasubduction Setting in the Westernmost Mediterranean Revealed by Intrusive Pyroxenite Dikes in the Ronda Peridotite (Southern Spain)</title>
<creator>Marchesi, C.</creator>
<creator>Garrido, Carlos J.</creator>
<creator>Bosch, Delphine</creator>
<creator>Bodinier, Jean-Louis</creator>
<creator>Hidas, Karoly</creator>
<creator>Padron-Navarta, Jose A.</creator>
<creator>Gervilla, Fernando</creator>
<contributor>Departamento De Mineralogía Y Petrología, Facultad De Ciencias, Universidad De Granada ; Université du Québec</contributor>
<contributor>Instituto Andaluz de Ciencias de la terra, 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>Australian National University (ANU)</contributor>
<description>International audience</description>
<source>ISSN: 0022-1376</source>
<source>EISSN: 1537-5269</source>
<source>Journal of Geology</source>
<publisher>University of Chicago Press</publisher>
<identifier>hal-00745853</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00745853</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00745853</source>
<source>Journal of Geology, University of Chicago Press, 2012, 120 (2), pp.237-247. 〈10.1086/663875〉</source>
<identifier>DOI : 10.1086/663875</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1086/663875</relation>
<language>en</language>
<subject lang=en>Gibraltar arc</subject>
<subject lang=en>Ronda peridotites</subject>
<subject lang=en>pyroxenites</subject>
<subject lang=en>Beni-Bousera</subject>
<subject lang=en>trace elements</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Contrasting tectonic reconstructions of the westernmost Mediterranean have been proposed to explain the origin of the Alboran marine basin contemporaneously with Cenozoic convergence between the African and European plates. Cr-rich pyroxenites in the Ronda massif record the geochemical processes occurring in the subcontinental mantle of the Alboran domain in the Late Oligocene, thus constraining the geodynamic scenario of Cenozoic extension in the western Mediterranean lithosphere. Clinopyroxene in intrusive Cr-rich websterite dikes crosscutting the Ronda peridotite is strongly depleted in Nb-Ta and enriched in light rare earth elements, as typically observed in arc magmas, and is in trace element equilibrium with Neogene subduction-related lavas from the western and central Mediterranean. Sr-Nd-Pb radiogenic isotopes indicate that the mantle source of the Ronda pyroxenite dikes was contaminated by a subduction component released by detrital sediments likely deposited in passive continental margins. Rather than convective removal or delamination of the lithospheric root, our data strongly support Alboran geodynamic models that envisage slab rollback as the tectonic mechanism responsible for the Miocene lithospheric thinning. The Ronda Cr-rich pyroxenite dikes represent the earliest unambiguous manifestation of subduction-related magmatism in the western Mediterranean and testify to the involvement of terrigenous sediments in the primitive stages of subduction.</description>
<date>2012</date>
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