GEOLOGI DAERAH BANYUSARI DAN SEKITARNYA, KECAMATAN MALAUSMA, KABUPATEN MAJALENGKA, PROVINSI JAWA BARAT

Abstract

The research area is in the Banyusari and surrounding areas, Malausma District, Majalengka Regency, West Java Province. Geographically, based on UTM (Universal Transfer Mercator) WGS 1984 coordinates, Zone 49S, the research area is at coordinates 195250 – 9215300 mT, 201250 – 9224399 mU. Physiographically, the research area is included in the Quaternary volcanic zone physiography with the stratigraphy of the research area composed of the oldest to youngest rocks from the Early Pliocene to Pleistocene. The differences in the rocks that make up each formation are an interesting thing to study further regarding aspects of geomorphology, statigraphy, geological structure, source potential and depositional environment in the research area. This research was carried out using geological surface mapping and analysis of laboratory data in the form of petrography and micropaleontology. The geomorphology of the research area is divided into three geomorphological units, namely the strongly undulating geomorphological unit - denudational hills (D2) and the hilly geomorphological unit - strongly denudational cuts (D3). The research area has dendritic, sub-denritic and parallel river flow patterns, with mature geomorphic stages. The stratigraphy of the study area is divided into three unofficial rock units of Pliocene - Pleistocene age. The rock units in the study area were deposited in a middle neritic environment. The rock units from old to young are the Kaliwangu carbonate sandstone unit, the old volcanic andesite breccia unit, and the andesite intrusion. The geological structure that develops in the research area is the horizontal fault to the right of the Cimuncang right slip fault. These structures were formed by a compressional tectonic phase trending west - east. The geology of the environmental system in the research area is divided into two, namely natural resources, rice fields and tea gardens, while natural disaster include landslides.

Keywords: Banyusari, Surface Geological Mapping, Stratigraphy, Geological History.