Geochemical characteristics of Quaternary volcanic rocks from Guntur Volcano, West Java, Indonesia A A Kausar (a*), I Setiawan (a), Y M Lai (b), L Lintjewas (a,b)
a. Research Centre for Geological Resources, National Research and Innovation Agency
LIPI Bandung Area (BRIN Bandung-Cisitu), Sangkuriang St, Coblong, Bandung City, West Java 40135
*andrie.kausar[at]gmail.com
b. Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan
162, Section 1, Heping E. Rd., Taipei City 106, Taiwan
Abstract
Garut is one of the places that has geothermal prospects in West Java that has different geochemical characteristics from other volcanoes which makes it interesting to study. The research area is located on the southeast side of the Garut-Bandung Ancient Caldera which is regionally included in the Quaternary Volcanic Zone. This zone lies between the first magmatic belt located along the southern part of Java and is related to the Paleogene subduction and the second magmatic belt is located in the north of the first magmatic belt that is related to Neogene subduction.
A total of 5 samples were taken volcanic rock samples were collected from Guntur volcanoes, whole-rock geochemistry provides two different trends from two different sampling localities which considered medium calc-alkaline to high-K calc-alkaline basalt and andesite, on the other side there are significant variations between their Rare Earth Elements (REE) patterns there. There is a possibility that the location of the Guntur volcano where formed is at the boundary between the Volcanic Front and Rear Arc, both magmas can erupt here, so it can see two different compositions. The objective of this research is to understand the geochemical characteristics of volcanic rocks and their tectonic environment.
