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191997 217 227 Journal of the Geotherrmal Research Society of Japan Vol.19,No4.(1997) P.217~P.227 Timing of Fracture Development Deduced from Microthermometry of Fluid Inclusions in Minerals from the Hijiori Geothermal Area, Yamagata Prefecture, Japan Abstract The microthermometric measurements of fluid inclusions in quartz in, and hydrothermal anhydrite and adularia were examined to determine the timing of fracture development in the Hijiori hot dry rock test site, Yamagata Prefecture, Japan. Two stages of fracturing are distinguished by the type of host mineral. The first stage is recorded as healed microcracks (fluid inclusion planes) in quartz of the, and in anhydrite veins cutting the. This stage is characterized by (1) homogenization temperatures inconsistent with the formation temperatures measured by borehole logging at sampling depths, (2) salinities ranging from 3.5 to 5.0 wt.% eq. NaCl. The minimum salinity close to that of sea water suggests that this stage was related to Miocene submarine volcanic activity. The second stage is recorded in hydrothermal anhydrite and adularia. This stage is characterized by (1) the temperaturedepth profile obtained from vein fillings close to profile measured after drilling, and by (2) salinities ranging from 0.0 to 2.9 wt.% eq. NaCl similar to modern brine. These characters possibly indicate that this stage is related to Holocene volcanic activity. - 217 -

Sasada1989 GT-2 Vollbrecht et al.1991 Fig.1 Geologic map of the Hijiori area (after Konda, 1974) with locations of the Hijiori HDR test site and outcrop 88081802. - 218 -

depth(m) 0 HDR-3 Quaternary dacite pyroclastic flow deposit and lake sediment 500 Neogene dacite andesite basalt 1,000 Cretaceous 1,500 1,641m quartz in (Gd1641), anhydrite vein (Anh1641) and calcite-anhydrite vein (Cc-Anh1641) 2,000 2,183m 2,253m adularia in open fracture (Adu2183) quartz in (Gd2253) and anhydrite vein (Anh2253) - 219 -

_ - 220 -

µ - 221 -

88081802 (Gd-Su) (Gd1641) anhydrite vein (Anh1641) calcite-anhydrite vein (Cc-Anh1641) HDR-3 2,183m adularia in open fracture (Adu2183) HDR-3 2,253m (Gd2253) HDR-3 2,253m anhydrite vein (Anh2253) Homogenization temperature ( C) - 222 -

88081802 (Gd-Su) (Gd1641) anhydrite vein (Anh1641) calcite-anhydrite vein (Cc-Anh1641) HDR-3 2,183m adularia in open fracture (Adu2183) HDR-3 2,253m (Gd2253) HDR-3 2,253m anhydrite vein (Anh2253) - 223 -

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