Hikami Granite Fm
Type Locality and Naming
The largest body of the Hikami Granite crops out around Mt Hikami
Synonym:
Lithology and Thickness
Granite dominant. The largest body of the Hikami Granite, which consists of massive or schistose granite, granodiorite and tonalite, crops out around Mt Hikami. Ishii et al., (1956) divided the Hikami outcrop into ‘Hikamisan type’ and ‘Ono-type’, while Asakawa et al., (1999) later divided it into ‘D-type’, most of which show schistosity, and massive ‘S-type’, with roughly coincides with the Ono-type. Kobayashi & Takagi (2000) considered that the massive Ono-type granodiorite intruded after the schistose granites had been mylonitized.
[Figure 1: Stratigraphy of the Palaeozoic of the South Kitakatmi Belt, NE Japan (after M. Ehiro et al., 2016)]
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Tsubonosawa Metamorphic Complex Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Kawauchi Fm
Regional extent
The largest body of the Hikami Granite with other bodies forming rather small and scattered outcrops in the Komatsu-Pass, Shiraishi-Pass, Yokamachi, Ezo, Hirasawa and Okuhinotsuchi areas.
GeoJSON
Fossils
Age
Depositional setting
Additional Information