Metamorphic history of pelitic gneiss in the Lhenice shear zone (Moldanubian Zone of the southern Bohemian Massif) inferred from compositional zoning of garnet and inclusions

Abstract

High temperature metamorphic rocks which compose lower continental crust have been reported from various orogenic belts. Their presence is important to define the past plate convergence zone and to understand the history of crustal thickening or subduction processes. However, in most cases evidence of its early burial history has been obliterated by extensive hydration, and replaced by low pressure mineral assemblages during a late amphibolite/granulite facies overprint that is related to exhumation. Micro-inclusions and chemical zoning in coarse-grained garnet also occasionally give useful information on the early stage P-T conditions of the host rock.