Carbonate facies and sedimentation of the Klapanunggal formation in Cibinong, West Java

Abstract

The limestone of Klapanunggal Formation is well exposed in Cibinong and its surrounding area, West Java. Detailed observation on carbonate rock has been conducted in this area and aims at the study of the carbonate facies and its growth environment. The method used in the field is the detailed investigation, while micropaleontologic and petrogaphic analyses were conducted in the laboratory. The result of this study indicates that the carbonate rocks in the studied area consist of four facies, namely: (1) boundstone facies, (2) packstone facies, (3) rudstone facies, and (4) limestone breccia facies. Based on these data, it can be interpreted that the boundstone facies was deposited in the reef front to reef crest environment, packstone facies developed on the lower slope, upper slope, and back-reef lagoon environment. Rudstone facies formed on the reef front, and breccia limestone facies formed in the lower slope. Geographically, the position of the carbonate body environment that is at the reef front, upper slope, and lower slope is expected to be in the north - northeast while the reef crest and back reef lagoon is on the South - Southwest.