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Volume 40 Issue 6
Dec.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(6): 965-976
ZHOU Wenlong,Jean Bottazzi,TAN Ming,et al.Mechanism of Miao Chamber in Ziyun county based on terrestrial laser scanning and structural analysis[J].Carsologica Sinica,2021,40(06):965-976. doi: 10.11932/karst20210606
Citation: ZHOU Wenlong,Jean Bottazzi,TAN Ming,et al.Mechanism of Miao Chamber in Ziyun county based on terrestrial laser scanning and structural analysis[J].Carsologica Sinica,2021,40(06):965-976. doi: 10.11932/karst20210606
shu

Mechanism of Miao Chamber in Ziyun county based on terrestrial laser scanning and structural analysis

doi: 10.11932/karst20210606
  • 1.

    Guizhou Institute of Mountain Resources，Guiyang，Guizhou 550001，China

  • 2.

    Committee on Speleology of GSC，Guilin，Guangxi 541004，China

  • 3.

    French Federation of Speleology，Lyon 69002， France

  • 4.

    Institute of Geology and Geophysics，Chinese Academy of Science，Beijing 100029，China

  • 5.

    Guizhou Education University，Guiyang，Guizhou 550018，China

  • 6.

    Qiannan Normal University for Nationalities，Duyun，Guizhou 558000，China

Funds:

 42161001

 黔科合基础[2017]1172

 黔教合KY字[2017]025

 黔科院J字[2018]11号

  • Received Date: 2021-04-30
  • Publish Date: 2021-12-25
    Abstract
  • Located in Ziyun county of Guizhou Province， Miao Chamber belongs to the Gebihe（another name Getuhe）underground river cave system. It is the largest chamber in the world as known by volume and surface area， and its planar projected area is second only to Sarawak Chamber in Malaysia. In 2014， for the first time， British researchers conducted the terrestrial laser scanning and collected the entire point cloud of Miao Chamber by using Riegl VZ-400 3D laser scanner. Combining the point cloud with the analysis of the geological structure， researchers have obtained the following new understanding of the basic morphological characteristics and control factors of Miao Chamber， （1） The integrity structure of Miao Chamber consists of two chambers and a section of large gallery， and this arched gallery probably becomes the world's largest span cave gallery currently registered. Morphologically， two domes connect with one vault， which shapes like the Chinese character "concave". The upper layer plan view of Miao Chamber presents a double-dome structure with two nearly regular polygons and their pedestals in parallel connection. These two polygons are independent but connect with each other. （2） The polygons of upper Miao Chamber are caused by the dislocation of multiple geological structures. This dislocation produced a set of fracture and joint systems in different directions and grades， and formed a pattern with lattice structure in this region， and then the dense fissures converged in Miao Chamber， which makes the dissolution the most developed. （3） Miao Chamber developed in the core of Jiaoma syncline with thick-massive limestone belonging to lower Permian stratum. The opening fissure at the bottom of the syncline provides good structural conditions for the entry of groundwater， which is a key factor that cannot be ignored for the development of Miao Chamber， one of the world’s hugest. （4） The upper layer gallery in Miao Chamber， together with the layered caves in the region， reflects the dual effects of tectonic uplift and river incision in geological history. It is speculated that in the early period many other streams of water from the high place converged in Miao Chamber toerode a huge underground space. Miao Chamber experienced the transition from hyporheic zone to vadose zone， and finally formed the huge cave chamber that accommodates a large number of collapsing boulders  due to stress adjustments. （5） According to the relationship between geomorphic form and geological structure， the development of "double dome" implies that the special geological structure is conducive to the formation of the huge underground caves in pairs， but the exact structure remains to be ascertained.

     

    • ZHOU Wenlong,Jean Bottazzi,TAN Ming,et al.Mechanism of Miao Chamber in Ziyun county based on terrestrial laser scanning and structural analysis[J].Carsologica Sinica,2021,40(06):965-976.
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