Igneous Rocks, Geological Structure, and Alteration in the Curug Jompong, Jelegong Village, West Bandung Regency as Potential of Geotourism Grace Aura Lovetine, Gina Maulida, Sabtanto Joko Suprapto, Priatna, Denny Lumban Raja, Adang Saputra
Bandung Polytechnic of Energy and Mining
Abstract
Bandung City is a basin surrounded by hills. On the western edge of the basin, there is a steep hill ridge stretching from north to south, cut by a narrow valley, the Citarum River Valley, where Curug Jompong is located. This is the site where the Ancient Bandung Lake breached. The purpose of this study is to understand why the Ancient Bandung Lake breached at this location. The results can be used to develop the Curug Jompong Area into a geoheritage and geotourism destination. The methodology involves observing landforms, lithology, geological structures, petrography, XRD, and chemical analysis, and drones mapping. In the research area, the drainage pattern is shaped by intense joints, faults from tectonic activity and magma cooling process. The lithology is composed of andesite intrusions, which are typically resistant to erosion. The intrusion body has undergone phyllic alteration with alteration minerals such as chlorite, calcite, kaolinite, illite, montmorillonite, quartz, and albite. The fault and joint structures, as well as the intensively developed phyllic alteration in Curug Jompong, have reduced the resistance of igneous rocks to erosion, resulting in the formation of the Citarum River valley, which drained water from the Bandung Basin, draining the Ancient Bandung Lake
Keywords: Curug Jompong, Bandung Lake, Citarum River, geological structure, alteration
