Scientific publications

The author discusses the petrological aspects of formation of some symplectitic intergrowths common in Neoarchean post-eclogitic basic rocks from the Gridino mélange zone. The sequence and pattern of mineral formation at decreased pressure (exhumation) were studied on the basis of paragenetic analysis. Quartz-clinopyroxene and quartz-clinozoisite symplectites are first described from these standpoints. Mineral reactions are shown to have occurred in a closed system, and symplectite formation was preceded by an increase in mole volume and mineral decompaction and a relevant change in the percentages of constituents.