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Jintao Kong, zhongjie Xu, Rihui Cheng, Duo Wan. Provenance of the southeastern South China Block in the Late Triassic and initiation of Paleo-Pacific subduction: Evidence from detrital zircon U–Pb geochronology. Journal of Earth Science. doi: 10.1007/s12583-022-1694-1
Citation: Jintao Kong, zhongjie Xu, Rihui Cheng, Duo Wan. Provenance of the southeastern South China Block in the Late Triassic and initiation of Paleo-Pacific subduction: Evidence from detrital zircon U–Pb geochronology. Journal of Earth Science. doi: 10.1007/s12583-022-1694-1

Provenance of the southeastern South China Block in the Late Triassic and initiation of Paleo-Pacific subduction: Evidence from detrital zircon U–Pb geochronology

doi: 10.1007/s12583-022-1694-1
  • Received Date: 14 Jan 2022
  • Rev Recd Date: 02 Jun 2022
  • Accepted Date: 03 Jun 2022
  • Available Online: 21 Jun 2022
  • During the late Paleozoic–early Mesozoic era, the sediment transport system and tectonic regime in the southeastern margin of the South China Block (SESCB) all changed, significantly affected by the Paleo-Pacific subduction. This study uses detrital zircon geochronology to discuss the Late Triassic source-to-sink system in the SESCB and provides some references for the Paleo-Pacific subduction process. The paleogeography and similarity of detrital zircon age distribution reveal three sinks in the SESCB during the Late Triassic: 1. the Yangchun–Kaiping–Gaoming area, comprising major age ranges of 260–220, 460–400, and 1,200–800 Ma, which might be sourced from the Yunkai Terrane; 2. the Jiexi–Kanshi–Nanjing area, characterized by the significant age component of 2,000–1,800 Ma, which corresponded to the Wuyi Terrane; 3. the Xinan area, consisting of significant age groups of 290–250 Ma and 380–320 Ma, which might be sourced from the magmatic rocks formed by the Huinan Movement and Paleo-Pacific subduction. The Upper Triassic strata contain many 290–250 Ma zircons, and their trace elements suggested a magmatic arc existed near the SESCB during the 290–250 Ma. Thus, we propose that the Paleo-Pacific subduction might have begun in the Early Permian.

     

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