Magmatic Evolution and Petrogenesis in the East African Rift System
The East African rift system provides the best example of youthful, profuse and varied volcanism in intimate association with the splitting apart of a continental cratonic regime. The alkaline-ultraalkaline character of a significant volume of these volcanics, previously adverted to by Prior (1903), Finckh (1906, 1912), Lacroix (1906, 1930), Kirschstein (1920), Holmes and Harwood (1932), leading up to Bowen (1938), has tended to become the hallmark of the province. This character has been endorsed through the 2 decades following the first modern syntheses on continental rift volcanism (e. g. Harris 1969; Gass 1970; King 1970; Bailey 1974). Thus alkaline volcanism associated with other rifts and paleorifts of the world is taken to be consistent with the East African type-example, and has become an important factor in formulating geodynamic hypotheses of continental rifting.
KeywordsDepression Geochemistry Fractionation Assimilation Magnetite
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