A Paleozoic subduction complex in Korea: SHRIMP zircon U–Pb ages and tectonic implications |
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Authors: | Sung Won Kim Sanghoon Kwon M Santosh Ian S Williams Keewook Yi |
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Institution: | aGeological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, South Korea;bDepartment of Earth System Sciences, Yonsei University, Seoul 120-749, South Korea;cDepartment of Interdisciplinary Science, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan;dResearch School of Earth Sciences, The Australian National University, Canberra, ACT, 0200, Australia;eGeochronology Team, Korea Basic Science Institute, Chungbuk 363-883, South Korea |
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Abstract: | The Wolhyeonri complex in the southwestern margin of the Korean Peninsula is divided into three lithotectonic units: Late Paleozoic Zone I to the west, Middle Paleozoic Zone II in the middle and Early Paleozoic Zone III to the east. Zones II and III display characteristics of continental arc magmatic sequence. Zone II is dominated by mafic metavolcanics, whereas zone III is characterized by the presence of dismembered serpentinite bodies including chaotic mélange. These zones are proposed to have been formed in a convergent margin setting associated with subduction. Here we present zircon SHRIMP U–Pb ages from the various units within the Wolhyeonri complex which reveal the Paleozoic tectonic history of the region. The Late Carboniferous ages obtained from the main shear zone between the Wolhyeonri complex and the Paleoproterozoic Gyeonggi massif are thought to mark the timing of continental arc magmatism associated with the subduction process. In contrast, Zone I with Neoproterozoic arc magmatic remnants might indicate deposition in a forearc basin. The Wolhyeonri complex also preserves strong imprints of the Triassic collisional event, including the presence of Middle Triassic high-pressure metabasites and eclogites near the eastern boundary of the Zone III. These range of radiogenic ages derived from the Wolhyeonri complex correlate well with subduction and accretion history between the North and South China cratons. Similar geochronological features have also been indentified from the Qinling, Tongbai–Xinxian, and northern Dabie areas in east-central China. The existence of Paleozoic coeval subduction in East Asia prior to the Triassic collision is broadly consistent with a regional tectonic linkage to Gondwana. |
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Keywords: | Subduction Collision Wolhyeonri tectonic complex Korean collision belt Qinling&ndash Dabie&ndash Sulu belt |
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