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Geological Magazine; January 2009; v. 146; no. 1; p. 144-149; DOI: 10.1017/S0016756808005785
© 2009 Cambridge University Press (CUP)
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A new mantle xenolith locality from Simien shield volcano, NW Ethiopia

DEREJE AYALEW*,{dagger}, NICK ARNDT{ddagger}, FLORENCE BASTIEN{ddagger}, GEZAHEGN YIRGU* and BRUNO KIEFFER§

* Department of Earth Sciences, Addis Ababa University, P.O. Box 729/1033, Addis Ababa, Ethiopia
{ddagger} Laboratoire de Geodynamique des Chaînes Alpines, UMR 5025 CNRS, BP 53, 38041 Grenoble Cedex, France
§ Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC, Canada

{dagger} Author for correspondence: dereayal{at}yahoo.com, dereayal{at}geol.aau.edu.et

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.

Key Words: lithospheric mantle • Simien • spinel lherzolites • xenolith




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