Geology of Banjaran, West Java and the geochemical evolution of its volcanic product

Banjaran area located at West Java, was not comprehensively studied in past five years, therefore the lack of geological information about that area give effects to people, especially who work in geological background. The target area would be a suitable place to study more detail of the geology in Banjaran. Therefore, the relationship between various types of volcanic product in this area should be expounded by geochemical analysis. Indication towards systematic changes in mineral composition, isotopic, major and trace elements are quite difficult due to inadequate data in term of petrological and geochemical analysis of the study area. Besides that, the distribution of volcanic product that present on the previous map shows no differentiation on their origin centre of eruption. The main objectives are to produce geological map of the study area in the scale of 1:25000 and identifying the geochemical relationship between various types of volcanic products that present in Banjaran. The research be carried by geological mapping, petrography analysis (thin section) , and using geochemical analysis approach (XRF) . The result of geochemical analysis is plotted in petrology diagram and interpretation has been done to identify magma source, their series and petrogenesis of the volcanic rock in Banjaran. Through geochemical analysis , the relationship between different type of volcanic product can be explain in term of their origin parent magma and their evolution to become their current state of rock in the study area