Metamafic Rocks of the Tana Belt, Kola Peninsula: Isotopic Age and PT Conditions

摘要

According to [1, 2], mica schists of the Korva Tundra Group (～1.91 Ga) of the Tana Belt were buried at the middle crustal level and later exhumed simultaneously with granulites of the Lapland Complex (～1.91 Ga). The Kandalaksha Group (KG) is composed of higher-temperature rocks, but their geo-dynamic evolution is similar to that of the Korva Tundra Group. Since the KG rocks have not been previously dated in this area, their synchronous metamor-phism with Lapland granulites has not been proved. To solve this problem, metamorphic PT conditions and U-Pb zircon ages were determined for two KG samples taken in the Pados-Yavr interfluve. The results are presented in this work.