Abstract
Newly found metamorphic block (c. 3 km × 1 km) within the Cretaceous granitic rocks in the Mt. Uki-dake area, northwest Kyushu, consists of two-pyroxene rock, garnet-orthopyroxene-cordierite gneiss and orthopyroxene tonalite being associated with layers or lenses of calcsilicate and ultramafic rocks. Geothermobarometries yield granulite-facies metamorphic conditions, approximately at 800 to 900°C and 400 to 500 MPa. On the basis of the similarity of the lithology and the metamorphic conditions, we propose that the present granulite-facies block and the neighboring amphibolite-facies block at the western part of Sefuri Mountains can be correlated to the high-grade sequence of the Higo metamorphic terrain in west-central Kyushu.
