Dike swarms,volcanism and tectonics of the western Afar margin along the Kombolcha-Eloa traverse (Ethiopia) |
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| Authors: | E Justin-Visentin B Zanettin |
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| Institution: | 1. Istituto di Mineralogia e Petrologia dell’Università, and CNR — Centro di Studio per la Geologia e la Petrologia delle Formazioni Cristalline, Padova, Italy
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| Abstract: | The rocks outcropping along the Kombolcha-Eloa traverse (western Afar, Ethiopia) can be attributed chiefly to the so-called Oligocenic « Alaji Rhyolitic Series » (32–28 m.y. B.P.) and to the overlying « Termaber Basalts » (28–18 m.y. B.P.), these latter being emitted from a central volcano — Mt. Garfa — rising on the Afar margin and tilted during Miocene. The age and the genesis of the dikes crossing the investigated volcanic succession are discussed in the light of the radiometric ages quoted inMegrue et al. (1972), distinguishing the pre-, the syn- and the post-tilt dikes. The dikes connected with a central volcanism are fed by shallow basins, whereas the others, connected with a fissural volcanism, are to be related to strong tensional movements. |
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