Post-kinematic lamprophyre from the southwestern part of Sør Rondane Mountains, East Antarctica: Constraint on the Pan-African suture event

Abstract

The Sør Rondane Mountains was situated within the collision zone between the West and East Gondwana during the Pan-African event. The mountains are made up of high-grade metamorphic rocks and various kinds of intrusive rocks. Here, we report the newly found post-kinematic lamprophyre (minette) collected from the southwestern part of Sør Rondane Mountains. The minette intruded along normal faults and has no sings of any metamorphism. The K-Ar dating of biotite separated from the minette gives an age of 563 ± 14 Ma. Considering mode of occurrence, age data and geochemical signatures, the minette intruded in the within-plate tectonic setting and the timing of magma activity would start after the suture event related to the formation of Gondwana supercontinent.