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The homogenization temperature of fluid inclusions in hydrothermal minerals from the Hatchobaru and the Kirishima geothermal fields in Kyushu has been measured. As a result it has revealed that the homo genization temperatures of the inclusions formed at reservoirs in the very active Hatchobaru geothermal field concentrate on a temperature near the boiling point curve of water, and agree well with the present reservoir temperature. Moreover, the geothermal fluid in the field seems to consist of the saturated or nearly saturated water, so that the pressure correction for the homogenization temperatue is unnecessary. On the other hand, in the less active Kirishima geothermal field the inclusions have a wide range of the homogenization temperature. the minimum values of which are quite close to the present underground temperature. This may indicate that the geothermal field has cooled down to some extent, forming the fluid inclusions at various stages of the cooling process. Some consideration has revealed that even the secondary inclusion has a homogenization temperature that is the same as that of the fluid at the time of necking down or refilling, if it traps only the saturated water. According, both primary and secondary inclusions are useful for knowing the thermal structure and the thermal history of geothermal fields.
日本地熱学会の論文