Abstract
Ca-rich scapolite occurs in quartz amphibolites from the Sarti area, Chalkidiki peninsula, northern Greece. The mineral composition of these rocks is amphibole + quarz + clinopyroxene + epidote + zoisite + scapolite + calcite + sphene + plagioclase + opaques (pyrite, graphite). The mineralogy and mineral chemistry indicate prograde regional metamorphism in the upper amphibolite facies in a high geothermal gradient at low pressure conditions, in the presence of a volatile-rich fluid phase. The association amphibole + clinopyroxene + zoisite represents the peak conditions reached during prograde metamorphism. The availability of CO 2 and probably SO 3− in the fluid phase as well as the bulk rock composition appear to have controlled the scapolite composition. A retrograde stage under low temperature and low fO 2 is also recorded
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