Ca-rich scapolite in quartz amphibolites from the Sarti area, Northern Greece
European Journal of Mineralogy Volume 3 Number 5 (1991), p. 887 - 894
published: Oct 2, 1991
manuscript accepted: Apr 23, 1991
manuscript received: Jun 20, 1990
ArtNo. ESP147050305010, Price: 29.00 €
Abstract Ca-rich scapolite occurs in quartz amphibolites from the Sarti area, Chalkidiki peninsula, northern Greece. The mineral composition of these rocks is amphibole + quartz + 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 -I- zoisite represents the peak conditions reached during prograde metamorphism. The availability of CO2 and probably SO3--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 fO2 is also recorded.