Received date: 2003-01-04
Revised date: 2003-06-15
Online published: 2003-12-01
Shilin County, which got her name after Shilin karst formed, is 86 km south of Kunming, the capital city of Yunnan Province. The karst area covers 900 km2. Among them 350 km2 are Shilin karst landscapes, which has been set as state-level natural protected area. Cave is one of the most developed karst features, too. From 1995 to 2000, around 70 caves were explored. Based on their section shapes, location and hydrogeological settings differences, they could be classified into three types of caves. The first type is fracture-like cave, formed by the enlargement by water along fractures. There are innumerable such type of caves developed in Shilin landform areas. Such type of caves is small, 0.5~2 m wide and 20~40 m deep. Strictly, the cave was the outcome of Shilin evolution. The second type of cave is horizontal caves, which mainly developed in the Fengcong -shallow depression landscape areas, right outside of Shilin landscapes. Those caves are very complicated, in view of their shapes or genesis. The third type is slope caves, and they mainly distribute at Fengcong-depression karst areas or hillsides of lower mountains, where ground water table is around 100~150 m deep. The cave is commonly connected with vertical shafts or collapse dolines as entrance. The fast flows play a great role in the formation of such type of cave. Generally, the cave development in Shilin County enjoys the following characteristics: (1) The cave development mainly concentrates in three elevation zones. (2) The development of cave is strongly controlled by the lithology of carbonate rocks. Most caves developed in Permian and Carboniferous carbonate strata areas. (3) Small and medium scales caves dominate absolutely. (4) Most caves have active water flow and are at the near water table stage. As the ceiling rock of caves is very thin, karst-windows are well developed. Most caves are water caves, which are normally shallow buried and (5) the orientation of cave passage obviously controlled by structure fissures and there is a great difference between caves of the east and west part of the region. In west, the orientations of caves are dominant by S-N or near S-N direction. But in east the W-E or near W-E orientations are predominant. The three water tracing tests in Tianshengguan area, the northeast part of Shilin have revealed the complicacy of underground cave system of this region: the North-south and West-east underground water systems coexist. In low-water period, the West-east conduit-fissure system works very well, but during high water level, some water drains in N-S direction. Obviously the caves show different stages of paragenesis. Caves suffered the alternation of several periods of deposition and periods of fast water flows and flood water.
Liu Hong, Zhou Yan . THE CHARACTERISTICS OF CAVE DEVELOPMENT IN SHILIN[J]. Advances in Earth Science, 2003 , 18(6) : 891 -898 . DOI: 10.11867/j.issn.1001-8166.2003.06.0891
[1] Zhang Faming, Geng Hong, Li Yuhui, et al. Study on the Lunan Stone Forest Karst, China [M]. Kunming: Yunnan Science and Technology Press, 1997. 40-76. [张发明,耿弘,李玉辉,等. 中国路南石林喀斯特研究[M]. 昆明:云南科学技术出版社,1997. 40-76.]
[2] Stanka S. Results of tectonic measurements in the Lunan Stone Forest, China[J]. Acta Carsologica, 1996,25: 438-455.
[3] Zhang Shouyue. The development and evolution of Lunan Stone Forest[J]. Carsologica Sinica, 1984, 3(2): 78-88. [张寿越.路南石林发育及其演化[J]. 中国岩溶,1984,3(2):78-88.]
[4] JinJa K, AndreJ K, TadeJ S, et al. South China karst 1999 preliminary research in Yunnan[J]. Acta Carsologica, 1999, 28(2): 225-240.
[5] TadeJ S. Rock relief of pillars in the Lunan Stone Forest[A]. In: Chen Xiaoping, et al,eds. South China Karst 1[C]. LjublJana:ZALOZBA ZRC, 1998. 51-67.
[6] Martin K. Lithologic properties of the three Lunan stone forests (Shilin, Naigu and Laoheiqin)[A]. In: Chen Xiaoping, et al. South China Karst 1[C]. Ljubljana: ZALOZBA ZRC,1998. 30-43.
[7] Wang Xueyu. Analysis of the microfeatures on the quartz sand grain surface in Lunan Stone Forest[A]. In: Society of Geography Conmnission of Geomophology Special in China ed. Karst Geomorphology and Speleology[C]. Beijing: Science Press, 1985. 87-95. [王雪瑜.路南石林石英砂表面微形态的分析[A]. 见:中国地理学会地貌专业委员会编.喀斯特地貌与洞穴[C]. 北京:科学出版社,1985.87-95.]
[8] Lin Junshu. Fromation of Lunan Stone Forest and environmental change[J]. Carsologica Sinica, 1997, 16(4): 346-350. [林均枢. 路南石林形成过程与环境变化[J]. 中国岩溶,1997, 16(4):346-350.]
[9] Janja K, Hong L, Metka P. Properties of underground water flow in karst area near Lunan in Yunnan[A]. In: KranJc A ed. Tracing Hydrology 97[C]. Rotterdam: A A Balkema, 1997.255-261.
[10] Janja K, Hong L, Metka P, et al. Tracing test in the Tianshenguan area[A]. In: Chen Xiaoping, et al, eds. South China Karst 1[C]. LJublJana:ZALOZBA ZRC,1998. 99-112.
[11] Janja K, Hong L. Water tracing test in the Tianshenguan region, china at low water level in November 1998[J]. Acta Carsologica, 1999, 28(2): 15, 241-253.
[12] Janja K, Hong L. Water tracing test in the Tianshenguan region, Yunnan-china at high water level [J]. Acta Carsologica, 2000, 29(2): 249-259.
[13] Stanka S, TadeJ S, JanJa K, et al. Baiyun cave in Naigu Shilin, Yunnan Karst, China[J]. Acta Geologica Sinca (English Edition), 2001, 75(3): 279-287.
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