This belt is distributed in the Inner Zone of the Southwest Japan. It was called the Sangun Metamorphic Rocks in the past. However, based on the ages of the protolith and the metamorphism, the Chizu Belt was defined by Shibata and Nishimura (1989) and further by Isozaki et al. (2010a). It comprises low-temperature and highpressure metamorphic rocks of the greenschist and glaucophane schist facies. The metamorphic age is about 180 Ma. The protoliths of these metamorphic rocks formed part of the Jurassic accretionary complex of the Mino-Tamba Belt (Hayasaka, 1987).