Zircon U-Pb dating of the hypersthene-plagioclase granulite in Liangcheng area of central Inner Mongolia and its geological significance

Abstract: Geochronology, petrology and petro-geochemistry of hypersthene-plagioclase granulite from Liangcheng area of central Inner Mongolia were investigated, and its forming age and tectonic background were discussed. The age of hypersthene-plagioclase granulite dated by LA-ICP-MS U-Pb of zircons is (1935±9) Ma, indicating that it was formed in Paleoproterozoic. Research shows that the rock mass was formed in a plate tectonic environment, the study area experienced mantle upwelling accompanied by underplating basaltic magma about 19 billion years ago, and the basaltic magma was intruded into the lower crust and caused the granulite facies metamorphism.