| Abstract |
Sulfur isotopes in fluids from four volcano-hosted geothermal systems in the Philippines are in a state of non-equilibrium. Comparison of sulfur isotope ratios in sulfate and sulfide with different chemical parameters show no consistent pattern to connote that there is correlation between present fluid chemistry and sulfur isotope ratios. There are, nonetheless, a small percentage of well fluids and minerals that are believed to be in isotopic equilibrium in the present-day geothermal environment. Isotope ratios as well as isotope geothermometer-derived temperatures suggest that most of these well fluids may have been in isotopic equilibrium at hotter, acidic, perhaps near-magmatic environments. |