T The research area located in Tajursindang, Purwakarta district, West Java Provinceis an area that has its own uniqueness because it is filled with rocks from volcanicactivity. This research was conducted to determine the geological order to find outthe geological and petrogenetic aspects of the Tajursindang area and itssurroundings. The research method was carried out in the form of geologicalmapping and laboratory analysis (petrographic analysis and XRF analysis).Geomorphologically it is divided into 5 units, namely mountain geomorphologyunits sharply slashed volcanically, hilly geomorphological units sharply slashedvolcanic, surging volcanic hill geomorphological units, corrugated denudationalhill geomorphological units and fluvial surging geomorphological units. Thegeological unit of the study area is divided into 6 units, namely porphyritic andesiticintrusion units, carbonate claystone units, andesit pyroxene intrusion units,hornblende intrusion units, dacite intrusion units, and alluvial sediment units. Thisarea is controlled by a horizontal fault structure in the vicinity of Panyindangan, theTajursindang caldera, a horizontal fault resembling Tajurkidul and a horizontal faultaccompanying Cirendeu. The geochemical analysis that has been carried out showsthat andesit and dacite rocks in this study area have Calc-Alkaline Series typemagma and are formed in their tectonic environment, the Island Calc-Alkali BasaltArc. In the study area it is estimated that it has a magma kitchen at ± 30km depthand is ± 220km from the subduction center.