“…Therefore, it is important to clarify how the Hida‐Oki Belt was connected to the continental geology of the Korean Peninsula, China, and Russia before the Miocene opening of the Japan Sea. Recent geochemical and zircon Hf isotopic studies on Triassic and Jurassic granitoids suggest that the Hida Belt can be correlated with the easternmost part of the Central Asian Orogenic Belt and the southern Korean Peninsula (Isozaki et al, 2023; Kawaguchi, Oh, & Jeong, 2023; Kawaguchi, Oh, Jeong, Furusho, et al, 2023). Furthermore, recent geochronological studies have established that the protolith ages of the Oki metamorphic rocks are Paleoproterozoic (Cho et al, 2021; Kawabata et al, 2022; Tsutsumi et al, 2006), whereas those of the Hida gneiss are late Paleozoic (e.g., Takahashi et al, 2017; Takehara & Horie, 2019), indicating that they have different histories before the Permo‐Triassic regional metamorphism.…”