Abstract
Development of pre-rift domal uplifts and volcanism in East Africa is related to mantle plume activity during two (possibly three) stable periods in the plate motion: before 80 myr, at 60-35 myr, and at 20-14 myr. Volume and composition of volcanics depend on the length of the stable period. Subalkaline basalts appeared only during long stable periods, while during short stable periods only alkaline magmas were generated. The general tendency of evolution in the pre-rift volcanic areals is from alkaline to transitional and then again to alkaline basalts.
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