[SMP35-P04] Petrology and geochemistry of Middle Proterozoic meta-tonalite in Cape Hinode, Prince Olav Coast, East Antarctica
Keywords:Meta-tonalite, Juvenile oceanic arc, Proterozoic, Antarctica
Geochemical compositions of the meta-tonalite, such as higher Al, Na, and Sr, and lower K and Y, in Cape Hinode suggests that the rock is conformable to a typical TTG produced by oceanic crust melting. On the other hand, the mafic rocks included in the meta-tonalite as xenoliths or meta-dikes show a wide variation of mineral assemblage and geochemistry. The most rocks are thought to be basic products on juvenile arc setting because they have almost flat chondrite normalized REEs patterns and negative Nb and Zr and positive LILEs MORB normalized patterns. However, several mafic rocks indicate a possibility of within plate type component based on the geochemical discriminations. These evidences suggests that the meta-tonalite of Cape Hinode was produced as a portion of a juvenile oceanic arc formed at about one billion years ago.