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A Late Oligocene Suprasubduction Setting in the Westernmost Mediterranean Revealed by Intrusive Pyroxenite Dikes in the Ronda Peridotite (Southern Spain)

Marchesi, C; Garrido, Carlos J; Bosch, D; Bodinier, Jean-Louis; Hidas, Karoly; Padron-Navarta, Jose; Gervilla, Fernando

Description

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....[Show more]

dc.contributor.authorMarchesi, C
dc.contributor.authorGarrido, Carlos J
dc.contributor.authorBosch, D
dc.contributor.authorBodinier, Jean-Louis
dc.contributor.authorHidas, Karoly
dc.contributor.authorPadron-Navarta, Jose
dc.contributor.authorGervilla, Fernando
dc.date.accessioned2015-12-08T22:25:43Z
dc.identifier.issn0022-1376
dc.identifier.urihttp://hdl.handle.net/1885/33574
dc.description.abstractContrasting 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.
dc.publisherUniversity of Chicago Press
dc.sourceJournal of Geology
dc.subjectKeywords: Cenozoic; clinopyroxene; delamination; magmatism; Neogene; Oligocene; peridotite; pyroxenite; rare earth element; slab; subduction; terrigenous deposit; Alboran Sea; Andalucia; Betic Cordillera; Mediterranean Sea; Ronda Massif; Spain
dc.titleA Late Oligocene Suprasubduction Setting in the Westernmost Mediterranean Revealed by Intrusive Pyroxenite Dikes in the Ronda Peridotite (Southern Spain)
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume120
dc.date.issued2012
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationU8501506xPUB103
local.type.statusPublished Version
local.contributor.affiliationMarchesi, C, Universidad de Granada
local.contributor.affiliationGarrido, Carlos J, Universidad de Granada
local.contributor.affiliationBosch, D, Universite Montpellier
local.contributor.affiliationBodinier, Jean-Louis, Centre National de la Recherche Scientifique–Universite Montpellier II
local.contributor.affiliationHidas, Karoly, Universidad de Granada
local.contributor.affiliationPadron-Navarta, Jose, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGervilla, Fernando, Universidad de Granada
local.description.embargo2037-12-31
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage237
local.bibliographicCitation.lastpage247
local.identifier.doi10.1086/663875
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T11:40:28Z
local.identifier.scopusID2-s2.0-84858025118
local.identifier.thomsonID000306042600005
CollectionsANU Research Publications

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