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Volume 40 Issue 6
Dec.  2021
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ZHAI Xiumin,ZHANG Yuanhai,LI Fayuan,et al.Evolutional process of erosional tiankengs[J].Carsologica Sinica,2021,40(06):952-964. doi: 10.11932/karst20210605
Citation: ZHAI Xiumin,ZHANG Yuanhai,LI Fayuan,et al.Evolutional process of erosional tiankengs[J].Carsologica Sinica,2021,40(06):952-964. doi: 10.11932/karst20210605

Evolutional process of erosional tiankengs

doi: 10.11932/karst20210605
Funds:

 2014005, 2014034, 2016011

 DD20190672

  • Received Date: 2021-04-30
  • Publish Date: 2021-12-25
  • In this paper, the common features of the erosional tiankeng are discussed by comparing the stratigraphic structure, geomorphic evolution and hydrogeological characteristics of four tiankengs in the world, i.e., Qingkou Tiankeng in Wulong karst of Chongqing and Boniu Tiankeng in Xiaonanhai Plateau of Hanzhong, China, Mangily Tiankeng in Ankarana Plateau, Madagascar, and Atea Tiankeng in Muller Plateau, Papua New Guinea. The current study indicates that the erosional tiankeng is commonly characterized by ternary (sandwich) or binary stratigraphic structure, covered-karst distribution, deep vadose zone and great topographic differences, as well as catchment of rainwater by the overlying layer. Based on these genesis conditions, when the surface water converges and flows into the soluble rock aquifer to form underground karst cave, its evolutionary stages can be divided into (1) sinkhole-shaft (underground river) stage, (2) erosion-shaft-chamber stage, (3) collapse-forming tiankeng stage, and(4)tiankeng degradation stage. The genesis analysis of erosional tiankeng provides a new insight into its evolutionary mechanism.

     

  • ZHAI Xiumin,ZHANG Yuanhai,LI Fayuan,et al.Evolutional process of erosional tiankengs[J].Carsologica Sinica,2021,40(06):952-964.
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