Variation in the chemical composition of Obuki Spring, Tamagawa Hot Springs (1951-2000)
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- Yoshiike Yuzo
- Department of Chemistry, Faculty of Science, Toho University
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Abstract
A change in the chemical composition of Obuki Spring, a typical chloride-sulfate acid hot spring in Japan, has been revealed by continuous observation for more than 40 years. The concentration of SO42- increased markedly from 1972 (∼1 g/l) to 1978 (∼3 g/l), then decreased gradually from 1978 to 1990 (∼1 g/l). Variations in the Cl- concentration were apparently within a smaller range than those of the SO42- concentration. The concentrations of numerous cations increased during 1972–1990, as did the SO42- concentrations. This variation is thought to be the result of a mechanism involving a second source, namely, volcanic emanations of a sulfur-rich composition, which were temporarily added to emanations from the first source; the first source has continuously supplied volcanic emanations to the original acid hydrothermal solution at Obuki Spring, and the second source is responsible for the increase in SO42-, Cl-, and acidity. Variations in the concentrations of most other components can be explained as the result of changes in the interaction between the acid hydrothermal solution and the surrounding rocks; the latter changes were themselves the consequence of increases in acidity.
Journal
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 37 (6), 649-662, 2003
GEOCHEMICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679526630656
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- NII Article ID
- 130003743445
- 10011937468
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- NII Book ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BD2cXhtVSjsQ%3D%3D
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- ISSN
- 18805973
- 00167002
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- NDL BIB ID
- 6789063
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed