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Volume 40 Issue 5
Oct.  2021
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Article Contents
HAN Haodong,WANG Chunshan,WANG Donghui,et al.Dissolution characteristics and mechanism of gypsum-salt-rich-red beds in Cretaceous Guankou formation in  Chengdu[J].Carsologica Sinica,2021,40(05):768-782. doi: 10.11932/karst20210504
Citation: HAN Haodong,WANG Chunshan,WANG Donghui,et al.Dissolution characteristics and mechanism of gypsum-salt-rich-red beds in Cretaceous Guankou formation in  Chengdu[J].Carsologica Sinica,2021,40(05):768-782. doi: 10.11932/karst20210504

Dissolution characteristics and mechanism of gypsum-salt-rich-red beds in Cretaceous Guankou formation in  Chengdu

doi: 10.11932/karst20210504
Funds:

 DD20189210

 DD20211402

 2021YJ0388

  • Received Date: 2020-10-01
  • Publish Date: 2021-10-25
  • Because the red beds in Guankou formation of Cretaceous in Chengdu are rich in gypsum salt, glauberite and other soluble minerals, the red bed karst phenomenon develop extensively in near-surface layer. This phenomenon restricts the exploitation and utilization of underground space. Based on the data of drilling core, geophysical exploration, well logging, physical property test and dissolution experiment, the distribution law of gypsum-salt-rich strata,the dissolution characteristics of gypsum-salt-rich-red beds , the influencing factors of dissolution development and karst mechanism of red beds are analyzed. The study shows that the dissolution of gypsum-salt-rich-red beds rich in gypsum salt in Guankou formation of Cretaceous in Chengdu generally develop in low hilly areas as well as plain and valley areas. The karst of red beds is comprehensively affected by many factors such as topography, structure, groundwater activity and faults, among which the groundwater activity and fault system are the most key factors. Besides, there are two different dissolution modes, first one, in the low hilly area higher than the plain area, surface water penetrates through the loose gravel layer of Quaternary, and then infiltrates into fissure-growing and weathered Guankou formation of Cretaceous with rich gypsum salt . After dissolving glauberite, gypsum, anhydrite and other minerals, groundwater flows downstream to the low-lying plain and river valley or converges into the surface runoff and finally promotes the dissolution. Second one, in the deeper part below the plain area, the surface runoff flows laterally along the syncline wing and the bedding or infiltrates along the fault system to recharge groundwater, which finally results in the dissolution phenomenon generating in the deeper part below 60 m.

     

  • HAN Haodong,WANG Chunshan,WANG Donghui,et al.Dissolution characteristics and mechanism of gypsum-salt-rich-red beds in Cretaceous Guankou formation in Chengdu[J].Carsologica Sinica,2021,40(05):768-782.
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