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首页> 外文期刊>The journal of earth and planetary sciences, Nagoya University >CHIME geochronology of granitic gneiss from Baekdong in the Hongseong area of the Gyeonggi Massif,South Korea
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CHIME geochronology of granitic gneiss from Baekdong in the Hongseong area of the Gyeonggi Massif,South Korea

机译：韩国京畿道洪城地区百洞花岗岩麻片岩的CHIME年代学

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摘要

CHIME dating was carried out on zircon and allanite in a sample of granitic gneiss from the Deokjeongri Granitic Gneiss, exposed at Baekdong (36°33.521'N, 126°44.131'E) in the Hongseong area, which lies in the southwestern part of the Gyeonggi Massif. Geochemically, the sample belongs to the high-K calc-alkaline series or shoshonite series of A-type granites, and is typical of within-plate granitoids. The CHIME ages for concentrically-zoned zircon cores and the core of an exceptionally large allanite grain are 824±29 Ma and 825±110 Ma, respectively. Outer growth zones in zircon with low Y2O3 and margins with high Y2O3 yield poorly defined ages of ca. 500 Ma and 230 Ma, respectively. Allanite rims give ages which cluster along two isochrons, 438+99 Ma for low-Y2O3 domains in equilibrium with Ca-rich garnet, and 254±30 Ma for high Y2O3 domains that formed during the breakdown of garnet. The present sample differs from granitic gneisses in the same lithological unit from other sites, in terms of both ages and geochemistry. Such diversity suggests that the Deokjeongri Granitic Gneiss is a composite unit, comprised of a variety of protoliths from differing tectonic environments and with differing tectonometamorphic histories.
机译：CHIME测年是在位于红城地区西南地区白洞（36°33.521'N，126°44.131'E）的Deokjeongri花岗岩片麻岩中的花岗岩片麻岩样品中对锆石和尿囊石进行的。京畿道地块从地球化学角度来看，该样品属于A型花岗岩的高K钙碱性系列或钠钾长石系列，并且是板内花岗岩的典型特征。同心分区的锆石岩心和特大型钙铝石岩心的CHIME年龄分别为824±29 Ma和825±110 Ma。 Y2O3含量较低的锆石的外部生长区和Y2O3含量较高的边缘的年龄年龄定义不明确。 500 Ma和230 Ma。尿囊轮缘的年龄沿着两个等时线聚集，对于低Y2O3域和富含钙石榴石的平衡，其为438 + 99 Ma；对于在石榴石分解过程中形成的高Y2O3域，为254±30 Ma。就年龄和地球化学而言，本样品不同于其他站点的同一岩性单元中的花岗岩片麻岩。这种多样性表明，Deokjeongri花岗岩片麻岩是一个复合单元，由来自不同构造环境和不同构造历史的各种原生岩组成。

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    Kazuhiro Suzuki; Ueechan Chwae; Daniel J. Dunkley; Sung-Won Kim; Izumi Kajizuka; Masayo Minami;

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    The Center for Chronological Research, Nagoya University,Chikusa-ku, Nagoya 464-8602, Japan;

    Korea Institute of Geoscience and Mineral Resources,92 Gwahang-no, Yuseong-gu, Daejeon, 305-350, South Korea;

    National Institute of Polar Research,10-3 Midoricho, Tachikawa, Tokyo 190-8513, Japan;

    Korea Institute of Geoscience and Mineral Resources,92 Gwahang-no, Yuseong-gu, Daejeon, 305-350, South Korea;

    The Center for Chronological Research, Nagoya University,Chikusa-ku, Nagoya 464-8602, Japan;

    The Center for Chronological Research, Nagoya University,Chikusa-ku, Nagoya 464-8602, Japan;

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