黒部川流域における宇奈月帯・飛騨外縁帯の南方延長 : 花崗岩体中のゼノリス類の分布と産状  [in Japanese] Southern extention of the Unazuki belt and the Hida marginal belt in the Kurobegawa area, Central Japan, estimated from the occurrence of xenoliths with granitic bodies  [in Japanese]

The north eastern part of the Hida region, the Kurobegawa area, is underlain by three geologic units; the Hida, Unazuki and Hida marginal belts. The Hida belt composed mainly of high-grade gneisses occupies the westernmost part of the area. The Unazuki belt is made up of medium-pressure type crystalline schists originated from upper Carboniferous strata and is in westward dipping thrust contact with the gneissic complex. The Hida marginal belt, which is considered to be a serpentinite melange, includes non-or weakley metamorphosed Paleozoic sediments and high-pressure type crystalline schists. The southern extention of the Unazuki and Hida marginal belts are obscured by the intrusion of early Mesozoic and late Cretaceous to Paleogene granites. However, the hidden parts are traceable within the granites by the occurrence and lithology of xenoliths. It is likely that, three belt shad come into contact with each other before the intrusion of early Mesozoic granites. The Unazuki belt and its basement of the Hida belt had been bordered with the Hida marginal belt by a tectonic zone trending in the N-S to NNW-SSE direction. This Kurobegawa sheared zone can be recognized by tracing the intermittent but linear distribution of xenolithic blocks and thermally metamorphosed granite mylonite.