Origin of the island arc Moho transition zone via melt-rock reaction and its implications for intracrustal differentiation of island arcs: Evidence from the Jijal complex (Kohistan complex, northern Pakistan)
Carlos J. GarridoJean‐Louis BodinierBruno DhuimeDelphine BoschIngrid ChanefoOlivier BruguierShahid HussainHamid DawoodJean‐Pierre Burg
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Research Article| August 01, 2007 Origin of the island arc Moho transition zone via melt-rock reaction and its implications for intracrustal differentiation of island arcs: Evidence from the Jijal complex (Kohistan complex, northern Pakistan) Carlos J. Garrido; Carlos J. Garrido 1Departamento de Mineralogía y Petrología & Instituto Andaluz de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Granada & CSIC, 18002 Granada, Spain Search for other works by this author on: GSW Google Scholar Jean-Louis Bodinier; Jean-Louis Bodinier 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Search for other works by this author on: GSW Google Scholar Bruno Dhuime; Bruno Dhuime 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Search for other works by this author on: GSW Google Scholar Delphine Bosch; Delphine Bosch 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Search for other works by this author on: GSW Google Scholar Ingrid Chanefo; Ingrid Chanefo 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Search for other works by this author on: GSW Google Scholar Olivier Bruguier; Olivier Bruguier 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Search for other works by this author on: GSW Google Scholar Shahid S. Hussain; Shahid S. Hussain 3Pakistan Museum of Natural History, Garden Avenue, Shakarparian, 44000 Islamabad, Pakistan Search for other works by this author on: GSW Google Scholar Hamid Dawood; Hamid Dawood 3Pakistan Museum of Natural History, Garden Avenue, Shakarparian, 44000 Islamabad, Pakistan Search for other works by this author on: GSW Google Scholar Jean-Pierre Burg Jean-Pierre Burg 4Structural Geology and Tectonics, ETH Zürich & Universität Zürich, Geologisches Institut, Leonhardstrasse, 19/LEB, CH-8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Carlos J. Garrido 1Departamento de Mineralogía y Petrología & Instituto Andaluz de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Granada & CSIC, 18002 Granada, Spain Jean-Louis Bodinier 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Bruno Dhuime 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Delphine Bosch 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Ingrid Chanefo 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Olivier Bruguier 2Laboratoire Géosciences Montpellier, Equipe Manteau-Noyau, UMR 5243, CNRS & Université de Montpellier 2, cc 49, 34095 Montpellier cedex 05, France Shahid S. Hussain 3Pakistan Museum of Natural History, Garden Avenue, Shakarparian, 44000 Islamabad, Pakistan Hamid Dawood 3Pakistan Museum of Natural History, Garden Avenue, Shakarparian, 44000 Islamabad, Pakistan Jean-Pierre Burg 4Structural Geology and Tectonics, ETH Zürich & Universität Zürich, Geologisches Institut, Leonhardstrasse, 19/LEB, CH-8092 Zürich, Switzerland Publisher: Geological Society of America Received: 19 Jan 2007 Revision Received: 12 Mar 2007 Accepted: 18 Mar 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (8): 683–686. https://doi.org/10.1130/G23675A.1 Article history Received: 19 Jan 2007 Revision Received: 12 Mar 2007 Accepted: 18 Mar 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Carlos J. Garrido, Jean-Louis Bodinier, Bruno Dhuime, Delphine Bosch, Ingrid Chanefo, Olivier Bruguier, Shahid S. Hussain, Hamid Dawood, Jean-Pierre Burg; Origin of the island arc Moho transition zone via melt-rock reaction and its implications for intracrustal differentiation of island arcs: Evidence from the Jijal complex (Kohistan complex, northern Pakistan). Geology 2007;; 35 (8): 683–686. doi: https://doi.org/10.1130/G23675A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract If the net flux to the island arc crust is primitive arc basalt, the evolved composition of most arc magmas entails the formation of complementary thick ultramafic keels at the root of the island arc crust. Dunite, wehrlite, and Cr-rich pyroxenite from the Jijal complex, constituting the Moho transition zone of the Kohistan paleo–island arc (northern Pakistan), are often mentioned as an example of high-pressure cumulates formed by intracrustal fractionation of mantle-derived melts, which were later extracted to form the overlying mafic crust. Here we show that calculated liquids for Jijal pyroxenites-wehrlites are strongly rare earth element (REE) depleted and display flat or convex-upward REE patterns. These patterns are typical of boninites and are therefore unlike those of the overlying mafic crust that have higher REE concentrations and are derived from light rare earth element (LREE)–enriched melts similar to island arc basalt. This observation, along with the lower 208Pb/204Pb and 206Pb/204Pb ratios of Jijal pyroxenites-wehrlites relative to gabbros, rejects the hypothesis that gabbros and ultramafic rocks derive from a common melt via crystal fractionation. In the 208Pb/204Pb versus 206Pb/204Pb diagram, ultramafic rocks and gabbros lie on the same positive correlation, suggesting that their sources share a common enriched mantle 2 (EM2) signature but with a major depleted component contribution for the ultramafic rocks. These data are consistent with a scenario whereby the Jijal ultramafic section represents a Moho transition zone formed via melt-rock reaction between subarc mantle and incoming melt isotopically akin to Jijal gabbroic rocks. The lack in the Kohistan arc of cogenetic ultramafic cumulates complementary to the evolved mafic plutonic rocks implies either (1) that a substantial volume of such ultramafic cumulates was delaminated or torn out by subcrustal mantle flow from the base of the arc crust in extraordinarily short time scales (0.10–0.35 cm/yr), or (2) that the net flux to the Kohistan arc crust was more evolved than primitive arc basalt. 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