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Report No.

Microscopic structures of mineral fragments from faults and clay veins in granite

Niwa, Masakazu   ; Tanabe, Hiroaki; Ishimaru, Tsuneari ; Shimada, Koji   ; Ueki, Tadamasa*

Fault gouge in granitic rocks is commonly clay-rich, as a result of fracturing and comminution caused by concentrated deformation and displacement, and subsequent retrograde hydration reactions. In some cases, fractures filled with clay minerals described as clay veins occur due to hydrothermal alteration. The hydrothermal clay veins associated with secondary shearing through old geologic time, or with secondary non-tectonic slips are often similar in appearance to typical fault gouges in active faults. Thus precise discrimination of active fault gouges from inactive clay veins is important for avoiding misleading estimates of seismic hazard. In this study, in-depth investigations were carried out on clay vein samples from the Hiroshima Granite, central Japan.



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