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A new mantle xenolith locality from Simien shield volcano, NW Ethiopia

Abstract : Thin-section observations and electron probe analyses, and trace element data are reported from a new mantle xenolith hosted in Miocene alkali basalt from the western flank of Simien shield volcano, Ethiopia. The spinel lherzolite enclaves contain variable proportions of olivine, orthopyroxene, green clinopyroxene and brown spinel, and have undergone deformation and partial recrystallization. They represent unmetasomatized, fertile xenoliths which were subjected to a late-stage melt–rock reaction. Trace element contents of clinopyroxene crystals are extremely low and quite different from those of the other xenoliths within the East African Rift System
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Submitted on : Tuesday, August 25, 2009 - 10:15:30 AM
Last modification on : Tuesday, October 19, 2021 - 6:57:59 PM

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Dereje Ayalew, Nick Arndt, Florence Bastien, Gezahegn yirgu, Bruno Kieffer. A new mantle xenolith locality from Simien shield volcano, NW Ethiopia. Geological Magazine, Cambridge University Press (CUP), 2009, 146 (1), pp.144-149. ⟨10.1017/S0016756808005785⟩. ⟨insu-00410887⟩



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