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Volume 41 Issue 1
Feb.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(1): 133-142
PAN Yufeng,WU Jianbiao,LI Shehong,et al.Cave characteristics and its genesis and evolution in the source area of Nandong underground river system in Nandong area, Southeast Yunnan[J].Carsologica Sinica,2022,41(01):133-142. doi: 10.11932/karst20220107
Citation: PAN Yufeng,WU Jianbiao,LI Shehong,et al.Cave characteristics and its genesis and evolution in the source area of Nandong underground river system in Nandong area, Southeast Yunnan[J].Carsologica Sinica,2022,41(01):133-142. doi: 10.11932/karst20220107
shu

Cave characteristics and its genesis and evolution in the source area of Nandong underground river system in Nandong area, Southeast Yunnan

doi: 10.11932/karst20220107
  • 1.

    273 Geological Team of Guangxi Zhuang Autonomous Region，Guigang，Guangxi 537100， China

  • 2.

    Southwest Institute of Geological Survey， Geological Survey Center for Nonferrous Metals Resources，Kunming， Yunnan 650093， China

  • 3.

    Earth Science Institute， Guilin University of Technology，Guilin，Guangxi 541004， China

  • 4.

    Institute of Karst Geology， CAGS，Guilin， Guangxi 541004， China

Funds:

 2018GXNSFAA281260

 DD20190022

  • Received Date: 2021-05-20
  • Publish Date: 2022-02-25
    Abstract
  • With its typical cavity system， the karst landform is developed in southeast Yunnan （one of the important karst areas in China）. There are few large karst springs but highly developed underground rivers in the east Yunnan fault depression basin. The distribution of underground rivers controls the distribution of karst groundwater resources in this area. The Nandong underground river system is a typical ultra-large karst plateau underground river system in the southeast Yunnan fault depression basin. Composed of many underground rivers， it is an underground river system with complex runoff paths and large water volumes. Karst caves are very developed and closely related to underground rivers. The runoff of the Nandong underground river in southeastern Yunnan is not only restricted by the hydrogeological conditions but also closely related to the regional rainfall characteristics， rock weathering， and other factors. The underground river system is the basic unit for the independent circulation of karst groundwater， which controls the transport of karst water migration and enrichment， hydrochemical evolution characteristics， resource composition， and environmental geological issues. All of those mentioned above provide a hydrological basis for cave evaluation research that takes the typical karst caves in the source area of Nandong underground river system in southeastern Yunnan as the research object. Based on geological research theory， this research summarizes the origin of karst caves in Nandong area through systematic cave analysis and geochemical analysis， establishes the development model of caves and underground rivers， discusses the formation and evolution mechanism of caves， and comprehensively explores the hydrological characteristics and karst control mechanism of large underground river systems， in order to provide more complete theoretical guidance for hydrogeological investigations. Research shows that the NW-trending extensional faults， developed in Triassic carbonate rocks， Permian clastic rocks and carbonate rocks， play an important role in the formation of caves in this area. The pure carbonate rock with strong rock dissolution of the highest Gejiu formation and the development of karst phenomena such as dry valleys， dissolved caves， dissolved pores and dissolved pipes on the surface also play an important role in the formation of caves in this area. Besides， the good development of hydrodynamic conditions for the westward flow of Yangliu river guarantees the cave development in the source area of the Nandong underground river system. Finally， human activities in the modern period contribute to the weak acidity of surface water in the area. And then the acid and alkali concentrations in the aqueous solution significantly affect the karstification of carbonate rock， so does acid and alkaline water solution. All of these mentioned above accelerates the development of karst caves. The study area was raised to sea level after the middle Triassic， and has been in the exposed stage since then. Carbonate rocks have been dissolved for a long time. Especially since the Quaternary， the topography and geomorphology as well as the climate change in this area have been stable， and the karst development have continued. Since 6 kbps in the middle of the Holocene. the caves in this area have experienced three stages of evolution， during which the formation time of the main body of the Shidong and Xianren cave is 6-4 kbps. In addition， through the exploration and analysis of the cave and the results of the tracer experiment， the development model of the stone cave and the underground river is established. In short， this study is of practical significance for the evaluation of groundwater resources in the Nandong area.

     

    • PAN Yufeng,WU Jianbiao,LI Shehong,et al.Cave characteristics and its genesis and evolution in the source area of Nandong underground river system in Nandong area, Southeast Yunnan[J].Carsologica Sinica,2022,41(01):133-142.
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