Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Petrology of ophiolite complex of Ciletuh Geopark, west Java, Indonesia: A preliminary study

The ophiolite complexes of Ciletuh area are located in Ciletuh Bay, Sukabumi, west Java. This area is becoming popular among the adventure travelers in Indonesia. This area is currently being prepared to become the first National Geopark in west Java. The Ciletuh complex is the only region that has oldest rock formation cropping out in west Java that is composed of very rare ophiolite complexes among the young volcanic rocks cover of west Java Island. The occurrence of this ophiolite is very rare in Java Island. There are only three regions which this occurs: Ciletuh in west Java, Karangsambung and Bayat in Central Java. In Ciletuh region, three major distributions of ophiolite are identified, from north to south, these are Gunung Badak, Gunung Beas and Ujungsodong areas. The area is located to the south of the present day active volcanic arc. Offshore lies the Java trench, a forearc basin and accretionary prism associated with the northerly subduction of the Indian Oceanic Plate (Figure 1). Duyfjes (1940) mentioned that the tectonic of the Ciletuh area is complicated. This study aims to identify the characteristic of ophiolite complexes in the Ciletuh region as geological heritage. This data will be later used to delineate the boundary of the proposed area as “Geopark” and to understand in detail its relationship with other ophiolite complexes in Central Java and Meratus in south Kalimantan.