Analysis of geological structure in the Takinoue geothermal area.
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概要
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Four major lithostratigraphic units of the Miocene Shizukuishi Group, the Kakkonda Group, the Tamagawa Welded Tuffs and younger volcanic rocks are recognized in the Takinoue (Kakkonda) area. Occurrence of geothermal fluids is controlled by highly permeable zones provided by fault and fracture system associated with folding in the Shizukuishi Group. A syncline was probable formed by buckling associated with flexural slip, whereas an anticline was made by the combined mechanism of bending and flexural flow. The genesis of folds and faults can be ascribed to as they were formed by the movement of tilting blocks of the pre-Tertiary basement rocks and the east-west trending lateral compressive stresses. Therefore, favorable local traps for steam accumulation are confined to major faults, extension fractures in the trough of a syncline, and slip plane (bedding plane) of argillaceous rocks and others with exception of an anticline.
- 日本地熱学会の論文
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