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Geological Society, London, Special Publications; 1999; v. 164; p. 157-177;
DOI: 10.1144/GSL.SP.1999.164.01.09
© 1999 Geological Society of London

Separate episodes of eclogite and blueschist facies metamorphism in the Aegean metamorphic core complex of Ios, Cyclades, Greece

M. A. Forster & G. S. Lister

Australian Crustal Research Centre, Monash University, Melbourne 3168, Australia

Blueschists and eclogites outcrop together throughout the Cyclades, Aegean Sea, Greece. Their coexistence has been explained by compositional variation between different lithologies and a single metamorphic episode under transitional eclogite—blueschist facies conditions has been proposed. However, a detailed study of the fabrics and microstructures in an exceptionally well-preserved eclogite boudin reveals a distinct sequence of several different mineral growth events, all under conditions of high-pressure metamorphism. The earliest metamorphic mineral paragenesis recognized is a blueschist facies, glaucophane-bearing assemblage. Eclogite facies metamorphism followed, which is suggested here as being pervasive throughout the rock mass. This period of metamorphic mineral growth was overprinted by widespread blueschist facies retrogression, with hydration ± metasomatism of earlier formed (eclogite facies) assemblages. These hydration reactions were responsible for a period of porphyroblastic mineral growth in the blueschist facies (prior to c. 40 Ma) which largely obliterated the earlier formed eclogite facies assemblages. Omphacite + garnet assemblages relict from the eclogite facies event are preserved only within the cores of the mafic boudins because fluid was not able to penetrate them. Evidence for the early blueschist assemblage is now preserved only as inclusions within the eclogitic garnets in the core of the boudin. This pattern of metamorphic mineral growth may have significant tectonic implications, as it is consistent with the pattern of metamorphic evolution across the high-pressure metamorphic belt of the Aegean region.





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