| type de publication : |
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Articles dans des revues avec comité de lecture |
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| domaine : |
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| titre : |
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Metasomatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines) |
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| auteur(s) : |
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M. Grégoire ( ) 1, Sébastien Jégo ( ) 2, René Maury 3, Betchaida D. Payot 4, Rodolfo A. Tamayo 4, Graciano P. Yumul 5 |
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| laboratoire : |
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| 1 : |
Dynamique terrestre et planétaire (DTP) |
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http://www.obs-mip.fr/omp/umr5562/ |
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CNRS : UMR5562 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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14 Av Edouard Belin 31400 TOULOUSE |
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France |
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Institut des Sciences de la Terre d'Orléans (ISTO) |
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http://www.isto.cnrs-orleans.fr/ |
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Université d'Orléans – CNRS : UMR6113 – Université François Rabelais - Tours – INSU |
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Campus Géosciences 1A, rue de la Férollerie 45071 Orléans cedex 2 |
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France |
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Domaines Océaniques |
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http://www-sdt.univ-brest.fr/ |
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Institut Universitaire Européen de la Mer (IUEM) – Université de Bretagne Occidentale [UBO] – Observatoire des Sciences de l'Univers – CNRS : UMR6538 |
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Technopôle Brest-Iroise, Place Copernic, 29280 Plouzané |
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France |
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| 4 : |
Philippine Council for Industry and Energy Research and Development-DOST |
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Philippine Council for Industry and Energy Research and Development-DOST |
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Gen. Santos Avenue, Bicutan, 1631 Taguig |
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Philippines |
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| 5 : |
National Institute of Geological Sciences |
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University of the Philippines, Diliman |
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National Institute of Geological Sciences, University of the Philippines, Diliman, 1101 Quezon City, Philippines |
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Philippines |
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| résumé : |
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The Monglo adakite contains mafic and ultramafic xenoliths, which probably originated from the mantle section of an Early Cretaceous supra-subduction zone ophiolitic complex located within the Luzon arc crust. Spinel-bearing dunites are dominant among this xenolith collection and display evidence for three episodes of subduction-related melt percolation. The first one is evidenced by an undeformed clinopyroxene characterized by convex-upwards REE pattern. This clinopyroxene crystallized from a calc-alkaline basaltic magma, likely formed in the Cretaceous supra-subduction setting of the ophiolite. Then, two metasomatic events, evidenced by orthopyroxene-rich and amphibole-rich secondary parageneses, respectively, affected most of the spinel dunites. The opx-rich paragenesis is related to the circulation within the dunitic upper mantle of hydrous slab-derived melts similar to those affecting the mantle peridotite xenoliths from Papua New Guinea and Kamchatka. Finally the amphibole-rich veins are related to the interaction between the studied dunite xenoliths and the host adakite or an adakitic melt similar to it. |
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langue du texte
intégral : |
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Anglais |
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| journal : |
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| Lithos |
| Publisher |
Elsevier |
| ISSN |
0024-4937 |
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| Audience : |
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internationale |
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| date de publication : |
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2008 |
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| volume : |
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103 |
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| numéro : |
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3-4 |
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| page, identifiant, ... : |
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415-430 |
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| mots-clés : |
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mantle xenoliths – Luzon arc – metasomatism – dunite – trace elements – adakite |
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| classification : |
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91.40.Rs |
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| contrat, financement : |
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Fieldwork and laboratory studies have been conducted with the financial and logistic help of UP-Diliman, the DUO-France program, the Ministère des Affaires Etrangères (French Embassy in Manila), the SUCRI program “Asie du Sud-Est”, Université de Bretagne Occidentale, Brest and of the CNRS and Université Toulouse III. |
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