Geology of Kp.Cipeuteuy, Bandung West Java and petrology of its volcanic products

A geological study is conducted in Kp.Cipeuteuy, Bandung West Java with an area of 25km2 and contour interval of 12.5 meters. The area is located in Kabupaten Bandung, geographically in 107 °35′45.03” - 107 °38’30.06” East-longitude, and 7°1′53.00 - 7°4'37.38” on South-latitude. This study aims to produce a geological map of 1:25,000 scale and specify in petrogenesis and evolution of magma based on the volcanic products in the study area. The evolution and genesis of volcanic products is studied and supported with thin section and detection of major and trace elements using X-Ray Fluorescent (XRF). The result is analysed through few plotting made based on Streckeisen, (1973), Mullen (1983), Peccerillo and Taylor, (1976), Le Bas et.al, (1986), and Harker’s diagram for major and trace elements. Stratigraphically, the study area has occurred few series of eruptions happened continuously in the period of Late Miocene and Pleistocene. The oldest rock is Tan, andesite with composition of plagioclase and pyroxene. Tan is pillowing Ԛan and Ql, series of andesite with composition of plagioclase, pyroxene and hornblende that interfingering with each other due to the age gap happened in volcanic eruptions. The youngest lies on top of Qan and Ql are Qvb which is volcanic breccia, a monomict type of breccia, with component of andesite and tuff as matrix. Qvb is interfingered with Qt, which is crystal-dominated tuff. The genesis of magma is in the island arc with calc-alkaline series. The geological map and geochemical analysis will provide additional and updated data for the use of future scientific research.