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Kasuga Mine

Kasuga-Mitsuka, Ibigawa city, Ibi county, Gifu pref., Japan

Occurrence

Dolomite skarn

Dolomite skarn deposit formed in the Permian Guadalupian (270 Ma) dolomite-limestone block of the Early Jurassic (180 Ma) Funafuseyama Unit of the Tamba-Mino-Asho accretionary complex. The dolomite-limestone block has been subjected to contact metamorphism by the Late Cretaceous (96 Ma) Kaizukiyama Granite. The Kaizukiyama Granite is S-type (Ilmenite-series). Approximately 1 km apart from the Kaizukiyama Granite, the heat source. Ages of sedimentary rocks were determined by radiolarians, and granite by K-Ar radiometric dating of biotite and by Rb-Sr whole rock isochron age.

Kasuga Mine

Outcrop of dolomite skarn in the Funafuseyama Unit. The white host is marble, and black nodules are aggregates of Mg-rich minerals such as phlogopite, spinel, and clinohumite. Nodules have higher weathering resistibity than the host, and protruded as shown in this photograph.

Reported Minerals

  • Chalcopyrite
  • Pyrite
  • Pyrrhotite
  • Sphalerite
  • Molybdenite
  • Calcite
  • Dolomite
  • Geikielite
  • Rutile
  • Spinel
  • Titanite(Sphene)
  • Forsterite
  • Clinohumite
  • Apatite
  • Almandine
  • Grossular
  • Allanite
  • Clinozoisite
  • Dravite
  • Cordierite
  • Andalusite
  • Scapolite
  • Diopside
  • Rhodonite
  • Apophyllite
  • Bustamite
  • Sepiolite
  • Palygorskite
  • Pargasite
  • Tremolite
  • Hastingsite
  • Magnesiosadanagaite
  • Wollastonite
  • Parawollastonite
  • Phlogopite
  • Aspidolite
  • Serpentine
  • Talc
  • Stilbite
  • Laumontite

Mineral Assemblages

  • Dolomite - Phlogopite - Clinohumite - Spinel - Geikielite - Rutile
  • Hornfels(Host) - Hastingsite
  • Dolomite - Forsterite
  • Calcite - Diopside - Wollastonite - Grossular
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