Mt Natib, Philippines- A Geochemical Model Of A Caldera-Hosted Geothermal System
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Journal Article: Mt Natib, Philippines- A Geochemical Model Of A Caldera-Hosted Geothermal System
AbstractGeochemical investigations have been conducted on the thermal springs within the Mt. Natib caldera, western Luzon, Philippines. The thermal waters are mostly of the SO4-HCO3-Cl and Cl-HCO3 types indicating substantial contributions from condensates and meteoric water. The spatial trend in Cl/B ratios in hot springs is consistent with dominantly vertical permeability and fluid movement. Cation geothermometry indicates subsurface temperatures greater than 200°C. A chloride-enthalpy plot reveals subsurface dilution of geothermal fluid with conductively heated surface water and points to a reservoir fluid with a chloride content of 5000 mg/kg at a temperature of 170°C. This temperature estimate is considered to be conservative due to evidence of near-surface low permeability and chemical reequilibration. Finally, a physico-chemical model of the caldera-hosted hydrothermal system at Mt. Natib is presented based on the available data.
- J. R. Ruaya and C. C. Panem
- Published Journal
- Journal of Volcanology and Geothermal Research, 1991
- Not Provided
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J. R. Ruaya,C. C. Panem. 1991. Mt Natib, Philippines- A Geochemical Model Of A Caldera-Hosted Geothermal System. Journal of Volcanology and Geothermal Research. (!) .