The purpose of this field trip was to investigate the extent, thickness versus distance relationships, and source of a young scoriaceous air-fall deposit exposed in the vicinity of the Kamodjang geothermal field. This deposit was first noticed in October 1981, exposed along the highway through the Kamodjang area. The eruption of similar scoria in the future could endanger the village of Pangkal…
The serpentinised ultramafic rocks of Northern Sumatra occur in linear zones along the main faults of the Sumatra Fault system within the Barisan Mountains They are considered to be alpine type and are discussed within a framework of a general review of the nature and origin of serpentinite belts. The greatest development of ultramafics o…