Sub-lithospheric source for Quaternary alkaline Tepi shield, southwest Ethiopia

6Citations
Citations of this article
32Readers
Mendeley users who have this article in their library.

Abstract

Mineral chemistry, major and trace elements and Sr-Nd isotopes are presented for basalts and trachybasalts from the Quaternary alkine Tepi shield from southwest Ethiopia. The lavas are variably porphyritic with phenocrysts of olivine (Fo67-87), clinopyroxene (Wo45-47 En38-40Fs13-16), plagioclase (An57-68) and Ti-magnetite set in a microcrystalline matrix. Although there are two high-MgO lavas (10.6-10.8 wt.% MgO), the majority of specimens are more evolved (MgO = 4.7-6.2 wt.%). The major element variations can be explained by olivine + clinopyroxene ± plagioclase fractionation, most likely consistent with low P fractionation. The geochemical variations observed in the Tepi lavas are interpreted in terms of variable open system fractional crystallization of a magma sourced from primitive mantle like source. Copyright © 2006 by The Geochemical Society of Japan.

Cite

CITATION STYLE

APA

Ayalew, D., Marty, B., Barbey, P., Yirgu, G., & Ketefo, E. (2006). Sub-lithospheric source for Quaternary alkaline Tepi shield, southwest Ethiopia. Geochemical Journal, 40(1), 47–56. https://doi.org/10.2343/geochemj.40.47

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free