are dated to be approximately 50 to 90 Ma. A K/Ar study reveals that subducted-related magmatism in Sumatra started roughly in early Mesozoic according to the evidences derived from the plutonic body on Barisan Mountain. The key mineralization found on Sumatra are epithermal veins of Au, Ag, Zn, Pb, and other metals in which these ore bodies are correlated to arc volcanism and subvolcanism intrusive bodies. Mount Sinabung is a stratovolcano of andesite and dacite in the Karo plateau of North Sumatra, 40 kilometres (25 mi) from the Lake Toba supervolcano. It has been continuously active since 2013. Nusa Tenggara Nusa Tenggara lies at the east side of Sunda. The information and study on this island are scarce compared to Java due to the difficulty of access. Generally, the island is composed on Quaternary volcanic deposits. Major volcanoes in Nusa Tenggara are Kelimutu and Mount Rinjani. Seismic studies have shown clusters of seismic events beneath active island-arc volcanoes, which may be a result from the collision zone. See also List of volcanoes in Indonesia References Further reading Newcomb KR & McCann WR. (1987). Seismic history and seismotectonics of the Sunda Arc. Journal of Geophysical Research; 92:421–439. Arcs of Indonesia Volcanic arcs x x Geology of Indonesia Plate tectonics