Computer Science
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.104...99t&link_type=abstract
Earth and Planetary Science Letters, Volume 104, Issue 1, p. 99-113.
Computer Science
8
Scientific paper
K-Ar ages and major/trace element compositions were determined for basaltic rocks from the Samburu Hills, northern flank of the Kenya dome, the Eastern African Rift system. Two peaks of basaltic volcanism occurred at 15-14 Ma and 6-5 Ma, with a hiatus at 9.8-7.2 Ma. Both peaks were followed by doming and rifting in this area, suggesting an active role of asthenospheric upwelling in the continental breakup. Basalt lava chemistry demonstrates a marked secular variation. Two magmatic cycles characterized by relative depletion of incompatible elements are recognized, both occurring immediately after the peak of basaltic volcanism and coeval with voluminous felsic volcanism and domal uplift/rifting. These variations may be attributed to increasing degrees of partial melting of mantle source material, in association with thinning of the lithosphere by thermal erosion through contact with the hot upwelling asthenosphere mantle. Cyclic asthenosphere upwelling is considered an important controlling process in the evolution of the Kenya Rift.
Kimura Naoki
Tatsumi Yoshiyuki
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