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Geochimie des elements traces des eclogites Panafricaines des Monts Lato au sud-Togo

Y Agbossoumonde, S.M. Taïrou, G Alayi

Abstract


Des éclogites affleurent au sein des massifs basiques de la zone de suture de la chaîne panafricaine des Dahomeyides au Togo. Des analyses en éléments majeurs et en traces effectuées, suggèrent que ces roches présentent des signatures géochimiques témoignant d'une tectonique distensive antérieure à la convergence panafricaine. Le magmatisme précoce correspondrait à la mise en place des basaltes de type E-MORB dans un environnement de marge passive recevant des sédiments détritiques.

Mots-clés: Eclogites, Monts Lato, éléments traces, Chaîne Panafricaine, Togo

English Title: Geochemistry of the trace elements of the pan-African eclogities of the Lato Mountains in south-Togo

English Abstract

Eclogites outcrop within mafic massifs from the Pan-African suture zone of the Dahomeyide belt in Togo. Major and trace element analyses suggest that these rocks display geochemical imprints that revealed a distensive tectonic episode which preceeding panafrican convergence. The early magmatism corresponds to the emplacement of E-type MORB into passive continental margin environment where detritical sediments were also deposited.

Keywords: Eclogites, Lato hills, Trace elements, Pan-African belt, Togo


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