Stable isotopic studies of Japanese geothermal systems

Stable isotopic studies on Arima type brines, Green Tuff type thermal waters and three volcanic systems, Hakone, Ibusuki, and Satsuma-Iwojima, were reviewed with emphasis on the origins of the water and sulfur species in these systems. Of the three volcanic systems, Hakone is a subaerial volcano con...

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Bibliographic Details
Published in:Geothermics 1976-01, Vol.5 (1-4), p.97-124
Main Authors: Sakai, H, MATSUBAYA, O
Format: Article
Language:English
Online Access:Get full text
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Summary:Stable isotopic studies on Arima type brines, Green Tuff type thermal waters and three volcanic systems, Hakone, Ibusuki, and Satsuma-Iwojima, were reviewed with emphasis on the origins of the water and sulfur species in these systems. Of the three volcanic systems, Hakone is a subaerial volcano consisting of calderas, central cones and a caldera lake, whereas Ibusuki belongs to a caldera half-drowned in the ocean. Satsuma-Iwojima is a volcanic island erupted within a drowned caldera about 40 km off the southern coast of Kyushu. Comparisons of the isotopic data of the waters and sulfur species from the three different volcanoes indicated that the waters of meteoric, oceanic and magmatic origins are involved in various ways and proportions in the volcanic activities. A considerable fraction of the volcanic sulfur species is shown to be recyclic in origin. It was demonstrated that a combined use of chemical and isotopic data on thermal waters and dissolved sulfates would yield useful information on the hydrological aspects of many geothermal systems.
ISSN:0375-6505