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<title lang=en>The Cryogenian arc formation and successive high-K calc-alkaline plutons of Socotra Island (Yemen)</title>
<creator>Denèle, Yoann</creator>
<creator>Leroy, Sylvie</creator>
<creator>Pelleter, E.</creator>
<creator>Pik, Raphaël</creator>
<creator>Talbot, Jean-Yves</creator>
<creator>Khanbari, Khaled</creator>
<contributor>Institut des Sciences de la Terre de Paris (iSTeP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS)</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>Centre de Brest ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)</contributor>
<contributor>Centre de Recherches Pétrographiques et Géochimiques (CRPG) ; Université de Lorraine (UL) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géologie et gestion des ressources minérales et énergétiques (G2R) ; Université Henri Poincaré - Nancy 1 (UHP) - Institut National Polytechnique de Lorraine (INPL) - Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Yemen Remote Sensing Center and Department of Earth and Environmental Science ; Université de Sana'a</contributor>
<description>International audience</description>
<source>Arabian Journal of Geoscience</source>
<identifier>hal-00647487</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00647487</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00647487</source>
<source>Arabian Journal of Geoscience, 2012, 5 (5), pp.903-924. 〈10.1007/s12517-011-0476-3〉</source>
<identifier>DOI : 10.1007/s12517-011-0476-3</identifier>
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<language>en</language>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Socotra Island belongs to the southern rifted margin of the Gulf of Aden and occupied in Neoproterozoic times a key position to constrain the age and the nature of the largely hidden Neoproterozoic rocks of the Arabian plate. Our integrated field, petrographic, geochemical and geochrono- logical study in the Neoproterozoic rocks recognises three main successive events: (a) high-temperature ductile defor- mation and metamorphism forming probably in a compressive or transpressive regime; (b) mafic to intermediate intrusions as vertical sheets, kilometre-scale gabbro laccoliths, mafic dike swarm and lavas which present mainly a depleted arc signature with some evidences of evolution from an enriched-arc signature; (c) felsic intrusions mainly composed of highly potassic calc-alkaline and pinkish granites dated between 840 and 780 Ma. Relationships between the various petrographic types and U-Pb data suggest that these events occurred during a relatively short time span (80 Ma at max). Earlier high-temperature-low-pressure metamorphism stage as well as geochemical signature of mafic rocks show that development of Cryogenian formations of Socotra were controlled successively by an Andean-arc and a back-arc setting. These features cannot be easily reconciled with those of the Arabian-Nubian shield to the west of Socotra and of the Mozambique Belt to the south. We propose that the Socotra basement was developed at an active margin close to the India block in Cryogenian times.</description>
<date>2012</date>
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