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Geochronological and Geochemical Studies for Triassic Plutons from the Wolhyeonri Complex in the Hongseong Area, Korea

홍성지역 월현리 복합체 내에 분포하는 트라이아스기 심성암류의 지질연대학 및 지구화학적 연구

  • Oh, Jae-Ho (Petoleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Sung Won (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
  • 오재호 (한국지질자원연구원 석유해저연구본부) ;
  • 김성원 (한국지질자원연구원 국토지질연구본부)
  • Received : 2013.07.26
  • Accepted : 2013.10.09
  • Published : 2013.10.28

Abstract

The Hongseong area of the southwestern Gyeonggi massif is considered to be part of suture zone that is tectonically correlated with the Qinling-Dabie-Sulu belt of China in terms of the preservation of collisional evidences during Triassic in age. The Wolhyeonri complex, preserved at the center of the Hongseong area, consists mainly of Neoproterozoic orthogneisses and Middle Paleozoic intermediate- to high-grade metamorphic schists, orthogneisses and mafic metavolcanics. The area includes various Middle to Late Triassic intrusives (e.g. dyke or stock). They are mainly monzonite and aplite with small intrusions of monzodiorit, syenite and diorite in composition. The SHRIMP U-Pb zircon ages yield 237 Ma to 222 Ma. The geochemistry of the studied Triassic intrusives show similar subuction- or arc-type signatures having Ta-Nb troughs, depletion of P and Ti, and enrichment of LILEs (large ion lithophile elements). In addition, the Triassic plutons in the Hongseong area, including those from this study, mostly possess high-K calc-alkaline to shoshonitic tectonic affinity. These results could be tectonically correlated to the post-collisional magmatic event following the Triassic collision between the North and South China blocks in China. Therefore, the Triassic plutons in the Hongseong area offer an important insight into the Triassic geodynamic history of the NE Asian region.

Keywords

Hongseong area;Wolhyeonri complex;Triassic pluton;post-collisional magmatic event;Triassic collision

Acknowledgement

Grant : 서부 경기지괴 지구조 진화 및 지질정보 구축

Supported by : 한국지질자원연구원

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