Al 2 O 3 versus MgO shows a positive trend in the Oligocene tholeiite basalts, possibly indicating fractionation of plagioclase and olivine, which is a typical fractionation feature in the tholeiitic magmatic series.
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Major and trace element compositions of basaltic lavas from western margin of central main Ethiopian rift: enriched asthenosphere vs. mantle plume contribution.
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