| Title | Stable Isotopes Study of Wayang Windu Geothermal Field, Indonesia |
|---|---|
| Authors | Rasi PRASETIO, Bettina WIEGAND, Dwiyogarani MALIK, Martin SAUTER |
| Year | 2015 |
| Conference | World Geothermal Congress |
| Keywords | stable isotope, strontium, recharge, lithology |
| Abstract | Wayang Windu geothermal field is located in West Java (Indonesia) and is associated with Quaternary active volcanoes. The geothermal system is transitional between liquid and vapor dominated systems. We have collected samples from hot springs and deep wells to analyse naturally occurring isotope compositions, i.e. δD, δ18O and 87Sr/86Sr. The compositions of δD and δ18O suggest that fluids from thermal manifestations and deep fluids are of meteoric origin. Deep fluids may have recharged from a lower altitude than fluids of the thermal manifestations. 87Sr/86Sr ratios of the fluid samples vary between 0.7046-0.7058 and are in agreement with 87Sr/86Sr ratios of Sunda arc calc-alkaline volcanic rocks. |