Magmatism of Papandayan Volcano based on Deuterium and Oxygen-18 Isotopic Composition

This study aims to find out the magma contribution using geochemical approach, one of which is through the measurement of deuterium and oxygen-18 Isotopic composition from condensate samples. In this study the Papandayan Volcano was chosen because it has a wide spread of fumarole fields. In 2017, fifteen years after 2002 eruption, the mixing fraction of oxygen-18 isotope generally decressed from high to medium and low such as Welirang 4.17%, Balagadama 41.15, Nangklak 34.21%, and Mas 61,15%. Mas Crater shows the highest number compared to all condensate samples in the Papandayan crater. To differentiate the classification of oxygen-18 mixing fraction which is analogous to the contribution of magma, the levels are arranged from very low to very high. Based on the deuterium isotope approach with Oxygen-18 fumarole gas, Papandayan has magmatic-hydrothermal characteristics and the magma contribution change to medium and very low mixing fraction of Oxygen-18 isotope. In addition, the study is very useful in the management of geo