Oil & Gas Geology ›› 2018, Vol. 39 ›› Issue (5): 932-942.doi: 10.11743/ogg20180508

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Tectono-stratigraphic sequence and basin evolution of the eastern Junggar Basin

Yi Zejun, He Dengfa   

  1. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2018-05-15 Revised:2018-07-11 Online:2018-10-28 Published:2018-09-06

Abstract: The east of Junggar Basin has undergone multi-stage tectonic movements since the Carboniferous.Its sedimentary center migrated several times and the strata suffered multiple stage erosion.In order to reveal the relationship between stratigraphy and basin evolution,we described the distribution of unconformity based on the interpretation of seismic profile covering the whole basin,and analyzed the tectonic dynamic conditions during unconformity formation.The results show that there are five regional unconformities in the eastern Junggar Basin.They are respectively located on top of the Lower Carboniferous,and at the bottom of the Middle Permian,the bottom of the Cretaceous,the bottom of the Paleogene and the bottom of the Neogene.Accordingly,the Carboniferous-Quaternary of the eastern Junggar Basin can be subdivided into six tectonic layers,namely the Lower Carboniferous,Upper Carboniferous-Lower Permian,Middle Permian-Jurassic,Cretaceous,Paleogene,and Neogene-Quaternary structural layers.From the Late Carboniferous to the Quater-nary,the area experienced five evolutionary stages in total.In the Late Carboniferous,the intra-continental tectonic defor-mation cycles appeared in the area;in the Hercynian,the continental basin formed initially,and in the Mesozoic-Cenozoic, superimposition of the Indosinian,Yanshan and Himalayan movements occurred in a row.The multi-phased and multi-section activities of Kelameili Mountain and Bogda Mountain,and the repeated reactivation of faults within the basin directly led to the tectonic layer superimposition and multistage evolution of Junggar Basin.

Key words: unconformity, tectonic layer, basin evolution, superimposed basin, Carboniferous, Junggar Basin

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