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Volume 40 Issue 6
Dec.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(6): 907-913
DUAN Wuhui,ZHOU Xianjin,PAN Yang,et al.Forming mechanism of breast-like stalactites based on the experimental analysis of cave deposition from Dixin canyon, Yangxin, Hubei[J].Carsologica Sinica,2021,40(06):907-913. doi: 10.11932/karst20210601
Citation: DUAN Wuhui,ZHOU Xianjin,PAN Yang,et al.Forming mechanism of breast-like stalactites based on the experimental analysis of cave deposition from Dixin canyon, Yangxin, Hubei[J].Carsologica Sinica,2021,40(06):907-913. doi: 10.11932/karst20210601
shu

Forming mechanism of breast-like stalactites based on the experimental analysis of cave deposition from Dixin canyon, Yangxin, Hubei

doi: 10.11932/karst20210601
  • 1.

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

  • 2.

    Hubei Fenglin Shifo Spring Tourism Investment Co. LTD，Yangxin，Hubei 435204，China

  • 3.

    China University of Geosciences（Beijing），Beijing 100083，China

  • 4.

    Hubei Nonmetallic Geology Company，Wuhan，Hubei 430030， China

  • 5.

    Hubei nonmetallic geology company，Wuhan，Hubei 430030，China

  • 5.

    Committee on Speleology of G.S.C，Guilin，Guangxi 541004， China

  • Received Date: 2021-04-30
  • Publish Date: 2021-12-25
    Abstract
  • The current study on the forming mechanism of breast-like stalactites is still at the stage of "scientific conjecture". In this study，samples of a pair of twin breast-like stalactites were collected in a cave of Dixin canyon at Yangxin county， Hubei Province. We carried out the mineral composition， crystal morphology and geochronology studies on the samples， and obtained new understanding. The breast-like stalactite is composed of calcite that formed the compact/porous inter-layers. The calcite of compact layer is rhombohedral，colorless and transparent，growing vertically downwards without lateral expansion. The calcite of porous layer is in the form of fine particles，milky white and opaque，and aggregates in a "coating" structure， with a certain degree of lateral expansion， which accounts for the expansion of the base and trunk of the breast-like stalactite. The dating results suggest that the compact and porous layers do not grow continuously， but existing significant hiatus. The 232Th content of the porous layer is generally one to two orders of magnitude higher than that of the compact layer，indicating that the content of water-insoluble impurities in the porous layer is significantly higher than that of the compact layer. Based on the experimental results and the observations that the "coating" depositions are also on the walls and roofs of the cave，we speculate that the solution recharging "coating" depositions seeps from surrounding rocks or solid sediments （stalactites）. The porous structure of "coating" deposition may be due to the diversion of underground river， the deterioration of the cave sealing， the decrease of CO2 concentration in the cave， and resultant acceleration of calcite crystallization rate. These factors make calcite crystal more defects and messy accumulation.

     

    • DUAN Wuhui,ZHOU Xianjin,PAN Yang,et al.Forming mechanism of breast-like stalactites based on the experimental analysis of cave deposition from Dixin canyon, Yangxin, Hubei[J].Carsologica Sinica,2021,40(06):907-913.
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