Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Characteristics of Epithermal Gold Mineralization in Tanggeung Area, Cianjur West Java, Indonesia

The tanggeung area is situated about 50 km from Cianjur, West Java, Indonesia, or about 120 km southeast from Jakarta Regionally the area lies the Sunda Banda magmatic arc where several hydrothermal gold-copper deposits are located. Lithology of the area is mainly composed of Late Miocene sedimentary rocks of sandstone, claystone of Bentang Formation. Pliocene hornblede andesite. overlain by Pleistocene-Pliocene pyroclastic tuff Bentang Formation was intruded by Late Miocene hornblende andesite. The lineaments trending NW-SE and circular feature are interprered from the combination of Landsat TM and SRTM imagery. The Hydrothermal signature is observed within the area. Hydrothermal alteration of propylitie argllic and silicification zones are widely distributed. The propylilic zone is characterized by green color of altered sedimentary land tufaceous hostrock altered to chlorite, while argilic zone is indicated by whitish to yellowish color of tufaceous host rock that altered to clay minerals. The silicification is confined to the envelop of the quartz veins. Several gold bearing quartz vein are observed trending almost NW-SE. The veins width range from S to 10 cm. The Most of quartz veins are characterized by banded, colloform, comb and massive textures and contain chalcopyrite, pyrite, sphalerite and galena Metal content in the quartz veins vary from 0.265 to 37.1 ppm Au: 1 to 79 ppm Ag; 32 to 40820 ppm Cu; 24 to 5370 ppm Pb: and 7 to 10580 ppm Zn. Keywords Epithermal, Tanggeung. Alteration, Quartz vein.