Abstract
The geothermal fluids in seven Japanese geothermal systems are tested for attainment of aqueous and gaseous equilibrium. Equilibrium between CH4, CO2 and H2 is attained at high temperatures but not maintained to lower temperatures in most Japanese geothermal systems. The H2/H2S ratio is probably equilibrated with Fe-bearing minerals. Gaseous compositions are very good indicators to identify processes in the geothermal reservoir, such as boiling and dilution. Lastly, the major aqueous composition and pH of Japanese neutral Na-Cl type geothermal fluid are predictable if two variables (e.g., temperature and one of the cation activities) are provided. -from Author
| Original language | English |
|---|---|
| Pages (from-to) | 335-355 |
| Number of pages | 21 |
| Journal | Geochemical Journal |
| Volume | 25 |
| Issue number | 4 |
| Publication status | Published - 1991 |
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ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
Attainment of solution and gas equilibrium in Japanese geothermal systems. / Chiba, H.
In: Geochemical Journal, Vol. 25, No. 4, 1991, p. 335-355.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Attainment of solution and gas equilibrium in Japanese geothermal systems
AU - Chiba, H.
PY - 1991
Y1 - 1991
N2 - The geothermal fluids in seven Japanese geothermal systems are tested for attainment of aqueous and gaseous equilibrium. Equilibrium between CH4, CO2 and H2 is attained at high temperatures but not maintained to lower temperatures in most Japanese geothermal systems. The H2/H2S ratio is probably equilibrated with Fe-bearing minerals. Gaseous compositions are very good indicators to identify processes in the geothermal reservoir, such as boiling and dilution. Lastly, the major aqueous composition and pH of Japanese neutral Na-Cl type geothermal fluid are predictable if two variables (e.g., temperature and one of the cation activities) are provided. -from Author
AB - The geothermal fluids in seven Japanese geothermal systems are tested for attainment of aqueous and gaseous equilibrium. Equilibrium between CH4, CO2 and H2 is attained at high temperatures but not maintained to lower temperatures in most Japanese geothermal systems. The H2/H2S ratio is probably equilibrated with Fe-bearing minerals. Gaseous compositions are very good indicators to identify processes in the geothermal reservoir, such as boiling and dilution. Lastly, the major aqueous composition and pH of Japanese neutral Na-Cl type geothermal fluid are predictable if two variables (e.g., temperature and one of the cation activities) are provided. -from Author
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UR - http://www.scopus.com/inward/citedby.url?scp=0026267498&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0026267498
VL - 25
SP - 335
EP - 355
JO - Geochemical Journal
JF - Geochemical Journal
SN - 0016-7002
IS - 4
ER -