Crustal contribution to the genesis of Ethiopian plateau rhyolitic ignimbrites: Basalt and rhyolite geochemical provinciality

From: Journal of the Geological Society | Date: January 1, 2003| Author: | Copyright information

Abstract: The Ethiopian continental flood basalt province contains large volumes of felsic eruptive rocks (>6 X 10^sup 4^ km3) overlying, and sometimes interlayered with the upper parts of the flood basalt sequence. Rb-- Sr isochron ages (30.60 +/- 0.79 Ma for Lima Limo and 30.17 +/- 0.54 Ma for Wegel Tena rhyolite sequences) coincide with the short, well-defined continental flood basalt pulse, indicating rapid emplacement of the rhyolites. Lima Limo rhyolites are characterized by relatively low TiO^sub 2^ (0.3-0.5%), Th (5-7 ppm) and Nb (48-68 ppm) concentrations, high Rb/Nb (1.7-3.0) and ...

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