Elongated mafic enclaves in the K-feldspar porphyritic hornblende-biobite granodiorite at Kawabata, south of the Asuke township. This strongly foliated granodiorite in the Ryoke metamorphic belt shows high δ18O value of +12.1‰, although it belongs to I-type. Relationship between the tectonic shearing and supply of 18O-rich fluids from the crustal materials is suggested (see Text p, 421- 438). |