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A U-Pb geochronological study of migmatitic gneiss in the Busan gneiss complex, Gyeonggi massif, Korea

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Abstract

Zircon U-Pb geochronology was applied to a migmatitic gneiss in the Busan gneiss complex, Gyeonggi massif, Korea. 207Pb/206Pb ages of concordant zircon grains reveal that overgrowth rims with Th/U ratios lower than 0.1 formed at 1937 ± 6 Ma during the migmatization and mantled the inherited cores of ca. 3500–2200 Ma. The 207Pb/206Pb age of the rims is consistent with the monazite Th-total Pb age (ca. 1938 Ma), suggesting that the rims are the product of Paleoproterozoic regional metamorphism. Our zircon age data are not sufficient for discerning the tectonic affinity of the Busan gneiss complex belonging to either Gyeonggi or Yeongnam massif. However, consistency of these ages with the ca. 1930 Ma Pb-Pb age reported from the Bagdalryeong gneiss complex, Gyeonggi massif, supports the tectonic model that the Busan gneiss complex is a part of the Gyeonggi massif. Discordant U-Pb data obtained from the zircon rims (293 ± 31 Ma) and the monazite Th-total Pb age (ca. 289 Ma) suggest that the Busan gneiss complex was affected by the Early Permian regional metamorphism during the Ogcheon (Okcheon) Orogeny. Therefore, we conclude that the Busan gneiss complex is a part of the Gyeonggi massif occurring as either a basement rock of the Ogcheon (Okcheon) metamorphic rocks, or a tectonically emplaced, exotic piece affected by the Early Permian Ogcheon (Okcheon) metamorphism. In addition, our U-Pb data suggest that the Busan complex is possibly linked with the Hida-Oki terrane in Japanese Islands.

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  1. Kenji Horie

    Present address: National Institute of Polar Research, 10-3, Midoricho, Tachikawa, 190-8518, Japan

Authors and Affiliations

  1. Institute of Geology and Geoinformation, Geological Survey of Japan, Advanced Industrial Science and Technology (AIST), Central 7, Higashi 1-1-1, Tsukuba, 305-8567, Japan

    Kenji Horie

  2. Department of Geology and Paleontology, National Museum of Nature and Science, Shinjuku-ku, Tokyo, 169-0073, Japan

    Yukiyasu Tsutsumi

  3. Geological Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 305-350, Republic of Korea

    Hyeoncheol Kim

  4. School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Republic of Korea

    Moonsup Cho

  5. Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan

    Hiroshi Hidaka & Kentaro Terada

  6. Project Center of Multi-Isotope Research for Astro- & Geochemical Evolution (MIRAGE), Hiroshima University, Higashi-Hiroshima, 739-8526, Japan

    Hiroshi Hidaka & Kentaro Terada

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Horie, K., Tsutsumi, Y., Kim, H. et al. A U-Pb geochronological study of migmatitic gneiss in the Busan gneiss complex, Gyeonggi massif, Korea. Geosci J 13, 205–215 (2009). https://doi.org/10.1007/s12303-009-0021-5

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