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Almost 100 samples of volcanic rocks from Akrotiri (Santorini Island) and Polyegos (Milos group of Is­ lands) were studied. Clinoptilolite and mordenite dominate the mineralogy in Akrotiri and Polyegos respec­ tively. In Akrotiri, an acidic mainly precursor, probably a rhyodacite-dacite type of rock, was the parent precur­ sor, although some samples indicate a more basic one. In Polyegos, it seems that a trachyandesite/rhyodacite type of rock has acted as precursor. However, this could be due to the possible depletion of Y under hydrother­ mal alteration, the increase of the Nb/Y ratio, and the shift (in the (Nb/Y vs. Zr/Ti02 diagram) of the nature of the precursor towards a more alkaline character. Thus, the true nature of the unaltered fresh precursor could actually be closer to the rhyodacite-dacite type of rock field. Geochemical classification diagrams using Si02, Na 2 0 and K 2 0 are not suitable for use with such materials. Diagrams using less mobile elements, such as Zr, Ti, Nb and Y are much more reliable, but with hydrothermal alteration conditions, their usefulness is variably restricted, and they should also be used with caution.

deltio tīs ellīnikīs geōlogikīs etaireias/deltio tīs ellīnikīs geōlogikīs etaireias

The mineralogy and geochemistry of zeolite-bearing volcanics from Acrotiri (Santorini island) and Polyegos (Milos group of islands), Greece. Implications for geochemical classification diagrams