GEOLOGY AND HYDROTHERMAL ALTERATION OF THE KUTAWARINGIN, SOREANG SUB-DISTRICT, BANDUNG REGENCY, WEST JAVA
Daniel Jefri Hasudungan Mirzam Abdurrachman Melky B. Rondonuwu

Sekolah Tinggi Teknologi Mineral Indonesia
Institut Tekonologi Bandung

Abstract

The need for metal minerals to become raw materials increases along with technological advances. Therefore, exploration is needed to increase metal mineral reserves in Indonesia. The research area is administratively included in the Soreang Sub district, Bandung Regency. In this study, we combine field geology with petrographic and mineragraphic analysis.
The rock units found in the study area from old to young are volcanic breccia, andesite lava and tuff which are intruded by porphyritic andesite. The geological structure that develops in the study area seen from the DEM map is divided into two main strains which are northeast west and northwest southeast. The alteration zones that develop in the study area are divided into argillic zones associated with kaolinite, illite and smectite minerals. Sub propylitic zones associated with chlorite, illite and carbonate minerals. Phyllic zones associated with sericite, chlorite and quartz minerals. Based on the presence of these minerals, it is interpreted that the alteration zone in the study area was formed at temperatures between 200 to 320 degrees celcius with the formation environment having a neutral pH. Mineralization that develops in the study area is in the form of veinlets mineralized by pyrite, chalcopyrite, sphalerite and galena. The mineral deposit type of the study area is low sulfidation epithermal type.

Keywords: Geology, Hydrothermal Alteration, Mineralization

Topic: Solid Earth Sciences