Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Mineralogy, Geochemistry and Fluid Inclusion Studies of the Arinem Te-Bearing Gold-Silver-Basemetal Deposit, Western Java, Indonesia

The ore is hosted in andesitic tuff, breccias, and lava of the Oligocene – Middle Miocene Jarapang Formation. The pyroclastic host rocks suffered mainly propylitic and argillic alterations and are characterized by the occurrence of chlorite, sericite, kaolinite, smectite and in place by carbonate as a result of quartz diorite intrusions during Late Oligocene – Middle Miocene. The formation is overlain unto nforrnably by a volcanic group of Pliocene age, which is composed of andesitic brec cias and tuff. Later on, this formation was intruded by pyroxene-hornblende andesite of Pliocene age. The youngest lithotypes within the area are volcanic rocks of Pliocene – Pleistocene age (M. Alzwar et al 1992; Fig.1C). Four normal faults cut through the research are a, the direction is almost North – South. The faults crop out along the Ar ins m,Bantarhu ni and Halimun quartz veins.