Preliminary Fluid Inclusion Studies in a High-Grade Blueschist Terrain, Syros, Greece

Hazel Barr*
Grant Institute of Geology, West Mains Road, Edinburgh EH9 3JW
*Present address: Atmospheric Pollution Group, Environmental and Medical Sciences Division, B551, Harwell Laboratory, Oxfordshire OX11 0RA.

Abstract: Preliminary fluid inclusion measurements have been made on quartz (whole rocks and segregations) and garnet from a blueschist terrain. Although further measurements are required, the fluids apparently associated with the blueschist event are aqueous with no thermometrically detectable CO2, a feature which is consistent with mineral-fluid equilibria studies. The salinity of the fluid inclusions is highly variable, from almost pure H2O to halite saturation, and a mechanism involving hydration reactions, such as proposed by Crawford et al. (1979), is suggested. Fluid inclusions associated with the greenschist overprint, which has affected the terrain, are also aqueous in nature.

Keywords: fluid inclusions • quartz • garnet • blueschist terrain • Syros • Greece

Mineralogical Magazine; June 1990 v. 54; no. 375; p. 159-168; DOI: 10.1180/minmag.1990.054.375.03
© 1990, The Mineralogical Society
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