Petrology and geochemistry of volcanic rocks of Aegina,Greece |
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| Authors: | G G Pe |
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| Institution: | 1. Department of Mineralogy and Petrology, Cambridge University, UK
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| Abstract: | The Plio-Pleistocene cale-alkalic lavas of Aegina are comparable geochemically with similar lavas from elsewhere in the South Aegean arc. At least four differentiation series, largely of basaltic andesite to rhyodacite type, have been recognized in Aegina. Petrographical and geochemical evidence shows that lavas and xenoliths have a common origin. The mineralogy of the rocks suggests an alternation of hydrous and dry conditions during their formation. The chemical composition of the basic rocks, and of basic cognate xenoliths in the lavas, suggest that the parent material of all the lavas was of basic composition. Fractionation of the early formed phases is believed to have been the main process for the formation of the more acidic differentiates. |
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