Common occurrence of prehnite and pumpellyite is newly identified from metabasites of Tobiishi sub -unit in the Kurosegawa belt, Yatsushiro area, Kyushu, where Ueta (1961) had mapped as a greenschist facies area. Prehnite and pumpellyite are closely associated with chlorite, calcite and quartz, and they mainly occur in white colored veins or in amygdules in metabasites of the relevant area, but actinolite and epidote are rare in them. Pumpellyite is characterized by iron -rich composition (7.2 -20.0 wt% as total iron as FeO) and its range almost overlaps with those in prehnite -pumpellyite facies metabasites of Ishizuka (1991). These facts suggest that the metabasites of the Tobiishi sub -unit suffered the prehnite -pumpellyite facies metamorphism, instead of the greenschist facies.
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