New SHRIMP U–Pb zircon ages of granitic rocks in the Hida Belt, Japan: Implications for tectonic correlation with Jiamushi massif

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Abstract

Abstract Granitoids in the H ida region of J apan encompass two main rock types: younger type‐1 granites and older type‐2 granites. Sensitive high mass‐resolution ion microprobe ( SHRIMP ) U – P b zircon dating of older type‐2 granites collected from the T ateyama area show similar ages of 245 ± 2 M a and 248 ± 5 M a for two gneissose granites, while a significantly younger intrusion age of 197 ± 3 M a was determined for the younger type‐1 granites collected from the H ayatsukigawa R iver which belongs to the O kumayama pluton. A felsic gneiss sample ( 07HI ‐3) collected from the right bank of the H ayatsukigawa R iver yielded multiple complex ages at 330 ± 6 M a, indicating the timing of the H ida regional tectono‐thermal events that formed the H ida gneisses; 243 ± 8 M a, representing the timing of intrusion of the augen granite; and 220 M a, indicating the timing of regional dextral ductile shearing that caused a repeated recrystallization of metamorphic rocks in the study area. Considering the geochronological data, the rock types and assemblages, basement, and S r– N d isotopic constraints, we propose that the H ida B elt separated from the J iamushi massif, which is located in the eastern margin of the C entral A sian O rogenic B elt.

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