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Nikubuchi mass
- High P/T metamorphic rocks
- Protolith: Cretaceous (139 Ma, Sm-Nd)
- Tectonic blocks of metamorphosed plutonic rocks originated from lower crust - upper mantle, and sedimentary rocks from accretionary complexes.
- Protolith was formed by crystallization differentiation of silica-saturated olivine basalt
- Metamorphic facies: Eclogite facies, Epidote-amphibolite facies
- Lithofacies: Dunite, Wehrlite, lherzolite, Spinel clinopyroxinite, Spinel websterite, Spinel-bearing mafic gneiss
- Distribution: 200 x 500 m2
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nikubuchidani valley, Niihama city, Ehime pref.
- Aoya et al. (2013) Geology of the Niihama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 181p. (in Japanese with English abstract 3p.)
- Sakurai and Takasu (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.101-121 DOI