Two types of terrain and regional mineralization in Sumatra, Indonesia

According to different stratigraphic systems, sedimentological palaeography, palaeo-biogeographic province system and magmatic cycles, the Sumatra Island can tectonically be divided into two types of foreign terrain：East Sumatra Terrain（Gondwana affinity） and West Sumatra Terrain（Cathaysia affinity）. The regularities of paleographic evolution and plate tectonic movement of the two different types of terrain control the regional distribution of metallic stratabound deposits. The magmatic intrusion at the continental vocanic arc controls the formation and distribution of Hercynian-Indonsinian metal-ore deposits，whereas Yanshanian metallic deposits are related to the rifting magmatic intrusion or deep sea extension（mantle bulge）. The Cenozoic Au-Ag metallic deposits are distributed along the huge Sumatra-Barisan fault and controlled by the magmatic activity at the continental volcanic arc.