Manifestation of High Temperature Hypogene Acid Alteration in Steaming Ground at the Hatchobaru Geothermal Field, Kyushu, Japan
- Location
- Otake-Hatchobaru, Japan
- Conference
- New Zealand Geothermal Workshop
- Year
- 2003
- Session
- Hydrothermal Mineralogy
- Language
- English
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Abstract
Steaming ground called Komatsu jigoku is located in the northern part of the Hatchobaru geothermal field where neutral pH deep water has been exploited for power production. Advanced argillic alteration zones composed of alunite, cristobalite, and kaolin are developed idaround the Jigoku due to the alteration by steam-heated waters. The occurrences and sulfbr isotopic data of alteration minerals suggest that most of alunite formed under the present fumaloic activities, though some alunite data suggest a different condition and foxmation in the presence of high temperature volcanic gas.
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