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首页> 外文期刊>Geological Society of America Bulletin >Jurassic tectonics of the eastern North China Craton: Response to initial subduction of the Paleo-Pacific Plate
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Jurassic tectonics of the eastern North China Craton: Response to initial subduction of the Paleo-Pacific Plate

机译：东北地区的侏罗纪构造：对古太平洋板材初始俯冲的回应

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摘要

The Yanshan fold-and-thrust belt (YFTB) on the northern margin of the eastern North China Craton (NCC) contains a succession of Jurassic volcano-sedimentary rocks that record the response of the NCC to the initial stages of subduction of the Paleo-Pacific Plate. We present stratigraphic profiles and new zircon U-Pb data from four basins in the YFTB to constrain the ages of the Jurassic lithological units and tectonic events related to the initial subduction. Following uplift at 200–190 Ma, protracted eruption of basalt at 188–167 Ma reflects the earliest tectonic activity in the YFTB. The eruption occurred in a backarc extensional setting, and migrated toward the west, consistent with WNW-directed subduction of the Paleo-Pacific Plate. The measured profiles and geochronological data demonstrate that the earliest phase of shortening in the YFTB during the Jurassic (event A of the Yanshan Movement in the Chinese literature) took place at 167 Ma. This compression terminated the magmatism and extension of the Early–Middle Jurassic, and resulted in the development of local thrusts, regional uplift, and a disconformity, without involvement of intense folding or the development of an angular unconformity. These observations are consistent with a weak to moderate intensity of deformation. The Jurassic rocks in the YFTB record the response of a backarc to the initial stages of subduction of the Paleo-Pacific Plate. Jurassic tectonics in the YFTB and the entire eastern China continent suggests that initial subduction of the Paleo-Pacific Plate began at ca. 190 Ma, and is consistent with the passive margin collapse model.
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    Wenxing Hao; Rixiang Zhu; Guang Zhu;

  • 作者单位

    State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences;

    State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences;

    School of Resource and Environmental Engineering Hefei University of Technology;

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  • 正文语种 eng
  • 中图分类 地质学;
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