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Kimitake Mine

Kuchi-Sakamoto, Aoi-ku, Shizuoka city, Shizuoka pref., Japan

Occurrence

Serpentinization

Ni-Cr mineral bearing serpentinite in the Setogawa Group along the Sasayama Tectonic Line, the boundary between the Eocene to middle Miocene (50-20 Ma) Setogawa Group and the Eocene to Oligocene (40-30 Ma) Mikura Group, members the Shimanto accretionary complex. Protolish of serpentinite is Harzburgite, Dunite, and Clinopyroxenite, and Ni was concentrated by serpentinization. The origin of this serpentinite block is considered as sedimentary serpentinite mélange from serpentinite seamounts at the fore-arc slope. The age of serpentinite intrusion is early to middle Miocene (20-15 Ma).

Kimitake Mine

Outcrop of sandstone of the Setogawa Group contacting with serpentinite. The white host is sandstone of the Setogawa Group. Thin pale green crust on the surface of the sandstone is annabergite. The black part on the surface is dirt on the surface of this outcrop. Ni-bearing minerals with magnesite were observed in and around the serpentinite block intruded in sedimentary rocks.

Reported Minerals

Mineral Assemblages

  • Magnesite - Annabergite - Millerite
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