Geochemical trends in the alkali basaltic suite of the Assab range (Ethiopia) |
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Authors: | Lucia Civetta Maria De Fino Luigi La Volpe Lucio Lirer |
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Institution: | 1. Institute of Geology and Geophysics, University of Napoli, Napoli Italy;2. Institute of Mineralogy and Petrology, University of Bari, Bari Italy;3. Institute of Mineralogy, University of Napoli, Napoli Italy |
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Abstract: | Two groups of rocks are distinguished in the Assab volcanic range (Afar) on the basis of their petrology. The first one is a typical alkaline suite with high Li, Ba, Rb, Sr, Th and U concentrations. A second subalkaline group may be related to a parental basalt characterized by low trace-element concentrations and intermediate in character between alkali and tholeiitic basalt.U and Th concentrations of the analyzed Assab basalts, as well the reported values for the alkali and transitional basalts of the East African Rift and the Afar depression, are higher than values reported for similar basalts from oceanic and continental environments. |
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