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The Cryogenian arc formation and successive high-K calc-alkaline plutons of Socotra Island (Yemen) ArchiMer
Denele, Y.; Leroy, S.; Pelleter, Ewan; Pik, R.; Talbot, J-y.; Khanbari, K..
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 geochronological study in the Neoproterozoic rocks recognises three main successive events: (a) high-temperature ductile deformation 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...
Tipo: Text Palavras-chave: Neoproterozoic; East African-Antartic Orogen; Arabian-Nubian shield; Socotra Island; Andean-type arc; Back-arc basin.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00090/20131/17839.pdf
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Contraintes par imagerie sismique pénétrante sur l'évolution d'une marge Cénozoïque réactivée en compression (cas de la marge algérienne, secteur de Tipaza) ArchiMer
Lepretre, Angelique.
The inversion of passive margins appears to be one of the first steps towards the initiation of new subduction zones. This crucial step in plate tectonics nevertheless still raises many questions. The study of margins currently reactivated by compressional tectonics is thus essential to better understand this process. These margins are uncommon, located in different geodynamic settings, and the factors determining their evolution are poorly constrained. The Algerian margin, located in North Africa, is one of handful of modern examples worldwide. The evolution of this margin, rifted during the Miocene, in a back-arc setting, is part ofthe complex puzzle of the western Mediterranean. Since a few million years, the margin has suffered inversion and...
Tipo: Text Palavras-chave: Marge algérienne; Structure crustale; Réactivation en compression; Bassin arrière-arc; Méditerranée Occidentale; Sismique-réflexion marine; Sismique grand-angle; Algerian margin; Crustal structure; Compressional reactivation; Back-arc basin; Western Mediterranean; Marine reflection-seismic profiles; Wide-angle seismic profile.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00498/60955/64358.pdf
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