P-T History of the HT/HP Granulite Metamorphism Associated with Thrusting in a Junction Zone between the Porya Guba and Umba Blocks, Lapland Granulite Belt (Northeastern Baltic Shield)

摘要

1. During metamorphism associated with thrusting in the melange zone at the contact between the Porya Guba and Umba blocks of the Lapland granulites (northeastern Baltic Shield), the temperature and pressure reached, respectively, 890-900℃ and 9.5-10 kbar. These conditions are in agreement with the P-T parameters of metamorphic and related metasomatic events in shear zones containing rocks with orthopyroxene-silli-manite assemblage, and are located in the rearmost portion of the melange zone.