GEOLOGY AND SPRING STUDY OF PASEH-CIKANCUNG DISTRICT AND ITS SURROUNDING, BANDUNG REGENCY, WEST JAVA PROVINCE

• Main Author: ZULKHOIRI (Nim : 12010059), ANWAR
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21178
• Institution: Institut Teknologi Bandung

The geological mapping and spring study in Paseh-Cikancung District and surrounding were conducted by performing outcrops observation, physical parameter measurement and hydrochemical analysis, and isotopes analysis. The purpose of this study is to know geological setting, quality of groundwater, aquifer zone, recharge area, and age of groundwater in the study area. <br /> <br /> <br /> <br /> The research area is located in the Quaternary Volcanic Zone to the north of Mt. Guntur. Morphological forms of the study are steep to very steep hills. The study area is divided into two geomorphic units, i.e: Volcanic Cones (V3) and Volcanic Footslopes (V7). <br /> <br /> <br /> <br /> Volcanostratigraphy of the study area, using khuluk and gumuk units, was analyzed based on time, lithology, and eruption center. The geological history began at Pleistocene when eruption of Mt. Pulus produced Breccia (PLa1) and Tuff (PLj2), and then Pulus Normak Fault was formed due to volcanic activity of Mt. Pulus. After that, eruption of Mt. Pasir Jugul produced Breccia-lava (PJa). Then Normal Dextral Pulus Fault was formed. After that, deposition of Andesite Lava of Mt. Putri (PTl), deposition of Tuff-Breccia I of Mt. Mandalawangi (Ma1), deposition of Tuff-Breccia II of Mt. Mandalawangi (Ma2), then footslopes of Mt. Mandalawangi collapse formed Mandalawangi Normal Fault. After this event, eruption of Mt. Mandalawangi produced Breccia (Ma3), following by deposition of Tuff of Mt. Buleud (Bj), and deposition of Breccia-lava of Mt. Pangrajin (PRa). At the same time, Tuff of Mt. Pulus (PLj2) was eroded causing cropping out of Breccia of Mt. Pulus (PLa1) and then Cigentur Normal Dextral Fault and Kasur Normal Dextral Fault were formed due to subduction of Indo-Australia Plate with Eurasia Plate and volcanic activity of volcanoes located at reseach area and its surrounding. <br /> <br /> <br /> <br /> Pysical parameters measurement of fourteen springs showed that the groundwater quality meets drinking water standard. Based on active flushing, low TDS (Total Dissolved Solid), and calcium bicarbonate facies, the groundwater is inferred to be located at the upper aquifer zone. Based on the analysis of stable isotopes (2H and 18O) and tritium (3H), recharge area is concluded to be located at Mt. Guntur Complex at the elevation of 1719 - 2240 meter above sea level, and the groundwater is modern groundwater (<5 to 10 years), respectively.