The Acid Zone Delineation In Tangkuban Parahu Geothermal Working Area

Abstract

The Tangkuban Parahu Geothermal Working Area is located in West Java, Indonesia, and is dominated by volcanic products from Mt. Sunda and Mt. Tangkuban Parahu. Mt. Tangkuban Parahu was generated after Mt. Sunda eruption which produced large caldera. Acid zone in Tangkuban Parahu GWA becomes important to be studied regarding its origin which associated with intensive volcanic activity up to present days. The study applying the magnetotelluric data to determine the total conductance numbers for identifying anomalies corresponding acid zones. Total conductance with specific amount tied with acid manifestations in some locations to acquire approximate number of acid zones. The acid zone map delivered from total conductance data further calibrated with aleration zones and comprimising structure data. From preceding processes, the study has obtained the 2D distribution map of acid zone in Tangkuban Parahu GWA. The acid zone spread from the Kawah Ratu and Kawah Domas northward to Cijalu, northeastward to Ciater, and southward to Kancah. While Cikole and Amblongan estimated to be area which consist more benign fluids with near-neutral pH.