Journal
JOURNAL OF GEOCHEMICAL EXPLORATION
Volume 89, Issue 1-3, Pages 306-308Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.gexplo.2005.12.006
Keywords
pH; geothermal waters; magmatic water; isotope
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In arc-type geothermal systems along the circum-Pacific rim, low pH well discharges in the geothermal systems of Japan and the Philippines are more enriched in oxygen-18 or deuterium or both as compared to neutral pH waters found in the same systems. isotope enrichment of both oxygen-18 and deuterium means higher percentage of magmatic vapour contribution to the well discharges due to the fact that un-neutralized magmatic water carries much abundant hydrogen ions to keep the water at a lower pH. This is consistent with the observation that acid geothermal waters usually occur near the volcanic heat source of a geothermal system, where the magmatic component tends to reach a higher percentage. (C) 2006 Elsevier B.V. All rights reserved.
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