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Geological Society, London, Special Publications; 1984; v. 17; p. 537-544;
DOI: 10.1144/GSL.SP.1984.017.01.40
© 1984 Geological Society of London

4. Neotethys: Greece and the Balkans

High pressure metamorphism in Ghiaros Island, Cyclades, Greece

Christos G. Katagas

Department of Geology, University of Patras, Patras, Greece

The various rock types encountered in Ghiaros island have suffered an episode of progressive regional metamorphism which produced high pressure low temperature assemblages with Na-pyroxene and glaucophane. Later in their metamorphic history the rocks were affected by retrograde metamorphism. Glaucophane crystals became continuously zoned and sodic pyroxene crystals developed a patchy composition. Zoning in amphiboles extends from glaucophanitic cores through intermediate Na-Ca winchite compositions to actinolite rims. The compositional differences observed between the various patches in individual pyroxene crystals are interpreted to reflect contrasting P-T conditions which drive the continuous reaction jadeitic pyroxene + quartz {leftrightharpoons} albite + acmitic pyroxene + quartz, to progressively less jadeite-rich pyroxene.