| Abstract |
We studied fluid inclusions mainly the deep reservoir at the Kakkonda Geothermal Field, Japan. The minimum Th (homogenization temperature) of liquid-rich inclusions are useful to make predictions of the underground tcmpcrature also in the deep reservoir, however it is necessary to notice that some Th are lower than borehole over 50 degrees. Both polyphase inclusions and liquid-rich inclusions abovethe neo-granitic pluton are considered to have been produced as the following; the ascending fluid which was the same as the type C to E or the type B inclusions (Sasaki et al., 1994) was diluted with the meteoric fluid. The distribution of the minimum Th represents the high temperature zone, which is regarded as an up-flow at present, in the north-westem deep reservoir. The distribution of polyphase inclusions in the north-western shallow reservoir is similar to the upper limit of Anhydrite, thus it suggests an up-flow in the early geothermal system. |