Magmatic process of the Late Pan-African in Dronning Maud Lana, East Antarctica

Abstract

The late Pan-African voluminous igneous activities, younger than ca. 520Ma, occur in central to eastern Dronning Maud Land, East Antarctica. These igneous rocks contain granitic rocks with mafic enclaves. Dronning Maud Land has been believed to be a continental-collision zone related to the formation of Gondwana supercontinent during the Pan-African. The granitic rocks underwent little deformation and intruded the host high-grade metamorphic rocks that indicate clockwise P-T-t path. The mafic enclave and granitic rocks intimately intrudes the host high-grade metamorphic rocks; thereby, underplated basaltic magma combined with decompression of the lower crust would be generated by granitic magma. This tectonic process may be triggered by extensional collapse after the continental collision.