Scientific publications

The author presents the microprobe compositions,
crystallographic formulas and constituents of 139 garnets from eclogitized metabasic rocks of Fe-tholeiite composition and Archean Mg-gabbronorites and Proterozoic eclogites from compositionally different gabbroids of three age generations. The compositional diversity of the garnets is due to differences in primary rock composition and metamorphic grade. Garnets from PR eclogitized dykes of a lherzolite-gabbronorite complex exhibit a common retrograde composition variation trend characterized by a decrease in the amount of pyrope and a slight increase in Ca. For garnets from a PR eclogitized Fegabbro dyke of age generation III under isobaric cooling conditions the evolutionary composition variation trend shows an increase in pyrope and a decrease in Ca-components. Variations in the compositions of zonal garnets were studied in detail, and a similarity in the distribution pattern of Mg, Ca and Fe cations during the retrograde transformation of AR and PR eclogites was found.