The Middle Paleozoic metasedimentary sequences of the western Gyeonggi Massif (Taean Formation and Wolhyeonri Complex), Imjingang Belt, and southwestern Okcheon Belt, provide clues to the successive tectonic events that occurred during the evolution of the Korean Peninsula. In this study, we present SHRIMP U-Pb ages of detrital zircon grains from the metasandstones of the Taean Formation and Yeoncheon Group of the Imjingang Belt and from quartzites in three Paleozoic formations of the southwestern Okcheon Belt. The zircon grains from all of the samples yielded similar U-Pb age spectra of Paleoarchean/Neoarchean to Middle Paleozoic, with a dominant age population within the Paleozoic. The maximum ages of deposition estimated from the youngest dominant concordant detrital zircons were 431-457. Ma for the western Gyeonggi Massif and Imjingang Belt, and 380-355. Ma for the southwestern Okcheon Belt. Permian metamorphic zircon overgrowths correlated with subduction prior to the Triassic collision were also found. Middle Paleozoic metamorphic zircon overgrowths that can be compared to those of the Yunkai-Wuishan Orogenic Belt of the Cathaysia Block were indentified in the Wolhyeonri Complex. The dominant zircon populations of this study and the available data for the Korean Peninsula compare well with those from the Yangtze Block, Cathaysia Block, and Qilian-Qinling Orogenic Belt, which were located at the northeastern margin of eastern Gondwana during the Early Paleozoic.
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We thank two anonymous reviewers for constructive reviews. This work was supported as a Basic Research Project (GP2012-012; Tectonic evolution of the western Gyeonggi Block and construction of geologic DB system) of the Korea Institute of Geoscience and Mineral Resources (KIGAM), funded by the Ministry of Knowledge Economy, Korea. This research was also supported as the Kyungpook National University Research Fund, 2012. SK performed 2013-8-0013 as part the GP2012-012 project. This study also contributes to the Talent Award to M. Santosh from the Chinese Government under the 1000 Talents Plan.
All Science Journal Classification (ASJC) codes
- Earth-Surface Processes