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Petrological Features Of Boseti Mountains, A Complex Volcanic System In The Axial Portion Of The Main Ethiopian Rift

P. Brotzu, L. Morbidelli, E. Piccirillo, G. Traversa
Published 1974 · Geology

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AbstractA petrographical and chemical research carried out mainly for the rocks belonging to the 2nd cycle of volcanic activity of Boseti Mts., shows the predominance of the salic over the mafic and the intermediate products. The magmatic evolution, which chiefly took place in a thermodynamic environment with initial low $$P_{H_2 O} $$ and $$f_{O_2 } $$ , has brought about subaluminiferous mugearitic types, also with trachytic affinity. Among peralkali-rhyolites, an anorthoclase fractionation can explain both their chemical variation and the production of pantelleritic liquids.
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