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Geoscience ›› 2019, Vol. 33 ›› Issue (01): 13-24.DOI: 10.19657/j.geoscience.1000-8527.2019.01.02

• Structural Geology and Stratigraphy • Previous Articles     Next Articles

Tectonic Background of Mesozoic Foreland Basin Development in the Southern Yellow Sea

XU Ming(), CHEN Jianwen(), LEI Baohua, SHI Jian, LIU Hong   

  1. Qingdao Institute of Marine Geology,Qingdao,Shandong 266071, China
  • Received:2018-04-30 Revised:2018-11-30 Online:2019-02-26 Published:2019-02-28
  • Contact: CHEN Jianwen

Abstract:

The southern Yellow Sea basin occupies the main part of the lower Yangtze plate. The basin had experienced multiphase deformation since the Proterozoic, led by tectonic interactions among the North China, Yangtze, and Pacific plates. The study utilized previous drilling and 2D seismic data to compare the regional stratigraphic and structural framework. The lower Yangtze plate had experienced the North China-Yangtze collision, with the development of the Mesozoic foreland basin. Based on previous studies, the lower Yangtze region had developed a complete Mesozoic sequence and recorded the subduction of oceanic crust, continent collision, foreland basin development and post-collisional tectonics. While in the south Yellow Sea basin, the development of Jurassic foreland basin was only confirmed in the northeastern sag, with its marine-terrigenous facies being interpreted in seismic sections. Stratigraphic comparison between the lower Yangtze terrestrial and marine areas revealed that the North China-Yangtze collision had different influence on different areas. During the Late Triassic-Jurassic, the southern Yellow Sea basin was likely denudated with thrust developed in the pelagic sequences. In the NE margin of the southern Yellow Sea basin, Jurassic foreland sequence was developed in the hanging-wall of the south-dipping boundary fault. The Jurassic foreland development tectonics may have been affected by the exhumation of the Qianliyan high-pressure metamorphic belt from the deep crust. The rapid uplift of the Qianliyan belt likely provided the space and sediments for the Jurassic foreland deposition in the southern Yellow Sea basin.

Key words: Southern Yellow Sea basin, 2D seismic profile, foreland basin, tectonic setting

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