Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 661-670.doi: 10.13278/j.cnki.jjuese.201603104

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Characteristics and Its Significance of Soft Sedimentary Deformations of the Upper Triassic Bagong Formation in Southeastern Qiangtang Block

Du Fangpeng1,2, Wang Jianqiang1, Niu Junqiang2, Tan Furong2, Yang Chuang2, Yan Mingming3   

  1. 1. State Key Laboratory for Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China;
    2. Aerophotogrammetry & Remote Sensing Bureau, China National Administration of Coal Geology, Xi'an 710054, China;
    3. Petro China Coalbed Mathane Company Limited Xinzhou Company, Xinzhou 036600, Shanxi, China
  • Received:2015-10-14 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by Natural Science Foundation of China(41330315) and China Geological Survey's Projects(12120113074300)

Abstract:

Within the Bagong Formation of Upper Triassic in Suoxian-Baqing, southeastern Qiangtang block, there are a large number of soft sedimentary deformation which formed in unconsolidated sediments. Their morphological characteristics mainly figured as pillow, ball, chain and curl. There are 7 layers of soft sedimentary deformation have been recognized along Zhadegai section with a total length of 100 m. Based on a detailed description and comparison of the deformation characteristics, these soft sedimentary deformations are classified as seismite, some deformations clearly show that the deformation is controlled by tensile stress. Seismite is the record of palaeotectonic activities in soft sediments. Densely dispersed soft sedimentary deformations in Bagong Formation shows that it was a tectonic active area at Upper Triassic. Compared with seismites in earlier Upper Triassic strata, we find that the tectonic activities are more intensely in Middle-Late Norian, which responds to ages of volcanic rocks in central Qiangtang block.

Key words: Qiangtang block, Baqing area, soft sedimentary deformation, Bagong Formation, Upper Triassic

CLC Number: 

  • P642.22

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