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CHIME monazite age of granitic rocks in the Sunchang shear zone, Korea: timing of dextral ductile shear

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Abstract

A CHIME (chemical U-Th-total Pb isochron method) age determination was carried out for the first time for monazite grains from the Sunchang, Taegang, and Namwon granites in the northeastern part of the Sunchang dextral ductile shear zone (Imsil-Namwon area), Korea. The results show that (1) the Sunchang granite is of 179±2 Ma, (2) the Taegang granite, 178±2 Ma, and (3) the Namwon granite 180±10 Ma (two mica granite), 181±6 Ma (porphyritic granite), 180±3 Ma (biotite granite), and 178±5 Ma (pegmatitic granite). These ages and closure temperature of monazite (650–700°C) suggest that the emplacement of these granites was contemporaneous in Early Jurassic. Based on the cooling curve of granitic rocks and deformation condition (ca. 300–550°C) estimated by feldspar microstructures of mylonites, the Sunchang shear zone was mylonitized during the period between 180 and 160 Ma. It indicates that the dextral ductile shear of the Sunchang shear zone occurred in early Middle Jurassic.

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Authors and Affiliations

  1. Division of Geology, Graduate School of Science and Engineering, Waseda University, Shinjuku, 169-8050, Tokyo, Japan

    Kyu-Hwan Cho

  2. Department of Earth Sciences, School of Education, Waseda University, Shinjuku, 169-8050, Tokyo, Japan

    Hideo Takagi

  3. Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan

    Kazuhiro Suzuki

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  1. Kyu-Hwan Cho
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  2. Hideo Takagi
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Correspondence to Kyu-Hwan Cho.

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Cho, KH., Takagi, H. & Suzuki, K. CHIME monazite age of granitic rocks in the Sunchang shear zone, Korea: timing of dextral ductile shear. Geosci J 3, 1–15 (1999). https://doi.org/10.1007/BF02910229

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