A new U–Pb dating and oxygen isotope analysis of zircons collected from a granitic mylonite and an undeformed granite in the Kamioka area, in the Hida Belt of southwest Japan, was conducted using a sensitive high‐resolution ion microprobe (SHRIMP) to restrict the timing of the mylonitization in the Funatsu Shear Zone, which is situated on the eastern and southeastern margins of the Hida Belt. Here, undeformed granite intrudes into the granitic mylonite deformed by mylonitization in the Funatsu Shear Zone. The granitic mylonite and the undeformed granite yielded U–Pb zircon ages of 242.6 ±1.9 Ma and 199.1 ±1.9 Ma, respectively. The granitic mylonite and the undeformed granite also yielded zircon oxygen isotope ratios (δ¹⁸O_VSMOW) of 7.74 ±0.37 ‰ and 5.74 ±0.17 ‰, which suggests that these rocks are derived from different magmas. Therefore, the timing of the mylonitization in the Funatsu Shear Zone is constrained to be at least 242.6–199.1 Ma, which is consistent with other data from the Tateyama area. The U–Pb zircon ages of the banded gneiss in the Kamioka area also reveals that the protolith is a sedimentary rock deposited at approximately 256 Ma, and regional metamorphism occurred at 245.0 ±6.6 Ma, which indicates that the mylonitization in the Funatsu Shear Zone occurred after the metamorphism in the Hida Belt. These geochronological and geochemical data give new insight into the relationship between the Hida Belt and the eastern margin of the Asian continent: the geochronological and geochemical data in this study support the possibility that the Funatsu Shear Zone is comparable with the Cheongsan Shear Zone located at the center of the Ogcheon Belt on the Korean Peninsula.

中文翻译：

---

飞ida带神冈地区飞ida片麻岩和花岗岩的U–Pb锆石年代学

使用敏感的高分辨率离子微探针（SHRIMP）对日本西南部飞ida带上冈冈地区的花岗石lon石和未变形花岗岩中收集的锆石进行了新的U-Pb定年和氧同位素分析。位于飞弹地带东部和东南边缘的Funatsu剪切带中的龙骨化时间。在这里，未变形的花岗岩侵入在船松剪切带中因白细胞化而变形的花岗白斑岩。花岗岩花岗石和未变形花岗岩的U–Pb锆石年龄分别为242.6±1.9 Ma和199.1±1.9 Ma。花岗糜和未变形的花岗岩也产生氧锆同位素比率（δ ¹⁸ ö _VSMOW）分别为7.74±0.37‰和5.74±0.17‰，表明这些岩石来自不同的岩浆。因此，船松剪切带的髓鞘化时间限制在至少242.6-199.1 Ma，这与立山地区的其他数据一致。Kamioka地区带状片麻岩的U–Pb锆石年龄也显示，原生岩是沉积岩，沉积在大约256 Ma，区域变质发生在245.0±6.6 Ma，这表明在Funatsu剪切带发生了隆起作用。在飞ida地带变质之后。这些地质和地球化学数据为飞H地带与亚洲大陆东缘之间的关系提供了新的见解：