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Geoscience ›› 2021, Vol. 35 ›› Issue (05): 1296-1310.DOI: 10.19657/j.geoscience.1000-8527.2020.067

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Geological Characteristics and Tectonic Evolution of Datong Basin

LIU Airong1(), XU Yongjing2(), LIU Chenglin2, PANG Ercheng2   

  1. 1. No.211 Geological Team, Shanxi Province Geological Prospecting Bureau, Xinzhou, Shanxi 034000, China
    2. No.217 Geological Team, Shanxi Province Geological Prospecting Bureau, Datong, Shanxi 037008, China
  • Received:2020-02-22 Revised:2021-06-28 Online:2021-10-10 Published:2021-11-04
  • Contact: XU Yongjing

Abstract:

Integrating the tectonic evolution and control, and geological characteristics (e.g., structure and thickness) of the sedimentary sequence, the sedimentary facies and environment of the Datong basin are summarized. It is suggested that the Datong basin was formed in the Early Mesozoic (end Late Jurassic to Early Cretaceous), and its tectonic evolution comprises three stages: fault depression formation, half-graben development, and basin formation. This area was not only filled with tectonic layers during the three periods, but also developed faults in the early of Cretaceous, early deposition of Baode Formation and late deposition of Nihewan Formation. Besides five unconformities was showed in the field survey. In the Datong basin and its surrounding areas, EW-trending fold structure likely existed before the Yanshanian movement, and NW-directed compression may have superimposed on the EW-trending structure after the movement. After that, despite strong denudation, the Late Paleozoic and Mesozoic strata remained in the superimposing synclinal nuclei of the EW- and NE-trending folds.

Key words: Datong basin, geological characteristic, tectonic evolution, half-graben-like depression, Early Cretaceous

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