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

Abstract
Geochemical 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.

Authors 
J. R. Ruaya and C. C. Panem








Published Journal 
Journal of Volcanology and Geothermal Research, 1991





DOI 
Not Provided
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Citation

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. (!) .