Journal of Marine Sciences ›› 2022, Vol. 40 ›› Issue (4): 11-24.DOI: 10.3969j.issn.1001-909X.2022.04.002

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Characteristics and tectonic implications of the Mesozoic residual strata in the East China Sea Shelf Basin

WANG Lei1, LI Chunfeng*1,2,3, LI Kedi1, YAO Zewei1, TAO Tiansheng1   

  1. 1. Ocean College, Zhejiang University, Zhoushan 316021, China;
    2. Hainan Institute, Zhejiang University, Sanya 572025, China;
    3. Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
  • Received:2021-12-30 Online:2022-12-15 Published:2023-02-09

Abstract: The East China Sea Shelf Basin is a Mesozoic and Cenozoic superimposed basin with high oil and gas potential. At present, the discovery of oil and gas in the basin comes from the Cenozoic reservoirs, and various aspects of the Mesozoic residual strata are less known. Furthermore, previous qualitative or semi-quantitative studies are usually spatially limited within specific structural units in the western part of the basin and mainly involves Cretaceous and Jurassic. This study collects and sorts out the latest reflection seismic data and well data penetrated into the Mesozoic in the entire study area. Based on seismic sequences of the Cretaceous, Jurassic and Pre-Jurassic, our results show that the Mesozoic residual strata in the East China Sea Shelf Basin suffered from severe denudation in the later period. The Mesozoic residual strata generally thicken to the east and south, and the range of residual strata expanded eastward over time. Comparing the distribution characteristics of the residual strata between different periods, it is further supported that the East China Sea Shelf Basin was a passive continental margin depression basin in the Triassic, and an active continental margin fore-arc basin in the Early-Middle Jurassic, and a continental margin back-arc extensional basin in the late Jurassic to late Cretaceous. Correspondingly, the subduction of the paleo-Pacific plate began in the Late Triassic-Early-Middle Jurassic, and the retreat of the plate began in the Late Jurassic. The east boundary of the Mesozoic proto of the East China Sea Shelf Basin was located on the east side of the Diaoyu Island uplift.

Key words: East China Sea Shelf Basin, Mesozoic, residual strata, sedimentary basin, tectonic implications

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