Grottes et karsts de Chine
Sur les traces de Xu Xiake

Sur les traces de Xu Xiake
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dong Bianfudong 1 - 蝙蝠洞1

Détail

Nom de la grotte : Bianfudong 1 - 蝙蝠洞1
Autres noms : Bat cave 1
Province, Préfecture, District :
Yunnan 云南省, Baoshan 保山, Baoshan
Latitude Nord - Longitude Est :
25.09549 - 98.82200
Altitude (m) : 810
Développement (m) : 1 500
Profondeur (m) :
Profondeur - / + (m) : 0 /
Volume (m3) :
1Entrée : Bianfudong 1 蝙蝠洞1,

Carte


Description 1


Bien Fu Dong No 1 (Bat cave)

The cave is located at the foot of the western slopes of Nujiang (Salween) River. The entrance is located 1.01 km NW from Ponjiagou village (Bin Men village) at 810 m altitude.

WGS Coordinates: N25.09549 E98.82200

The entrance has semi elliptical form wit dimensions 3 x 2 m. The cave is a straight-line gallery without branches, with approximate length of 1500 m and light dip. In fact, this is an underground brittle unstuck, tracking down inside a plastic shear zone. The zone is 50-80 м wide. It progress in N-S direction (350°-170°), and slips down to east with mainly 45° dip. This zone represents one of the westernmost sub-parallel ductile faults that take part of the Nujiang Fault System.

The mylonites in the zone are developed above a monotonous mudstone matrix. They contain new-formed muscovite, sericite and chlorite that indicate greenschist facies conditions of their formation. The muscovite sheets reach to 1 cm width. They represent the most abundant mineral in the greenschist paragenesis. The observed shear-sense criteria indicate that the zone was affected of sub horizontal dextral strike-slip plastic shear. This cave has nothing to do with the karst. It is purely tectonic phenomenon. There are not carbonate rocks in the area. In some places inside the cave, there are fractures into the rocks with cooling or dribble water inside, slightly enriched in CO2, which precipitate some centimetric stalactites. The temperature of the air inside the cave is 18.4o C.

Alexey Zhalov edited by, Chinese-bulgarian-greek speleological expedition “Gaolingongshan 2011” in Yunnan province, China. (2012)
48p., 65 photos couleur, 9 figures, Bulgarian Federation of Speleology, April 2012.
Analyse :
This report details the joint Chinese-Bulgarian-Greek expedition carried out by members of Bulgarian Federation of Speleology and Yunnan Institute of Geograhpy & China Exploration & Research Society (CERS ) Yunnan branch, Yunnan Province, China. Yunnan 2012 was a 4-week, 13 person winter caving expedition. This expedition involved a first speleological exploration of the caves of Gaolingongshan and to known some unexplored areas on the mountain. Major finds included the logging and exploration of 8 new caves on the territory of the mountain and its vicinity. The most significant caves which the team explored were far from the main exploration area close to Kunming city. Among them are the longest caves explored during the expedition Yenze Dong (Swallow cave) – 1514 m and Da Shi Dong (Big rock cave) - 1394 m. During the expedition were mapped 11 caves with a total length of the galleries 4972 m and depth 429.60 m (-318.2/+ 89.4)

1521 caractères - Lu 128 Fois

Bibliographie 1


Alexey Zhalov edited by, Chinese-bulgarian-greek speleological expedition “Gaolingongshan 2011” in Yunnan province, China. (2012)
48p., 65 photos couleur, 9 figures, Bulgarian Federation of Speleology, April 2012.
This report details the joint Chinese-Bulgarian-Greek expedition carried out by members of Bulgarian Federation of Speleology and Yunnan Institute of Geograhpy & China Exploration & Research Society (CERS ) Yunnan branch, Yunnan Province, China. Yunnan 2012 was a 4-week, 13 person winter caving expedition. This expedition involved a first speleological exploration of the caves of Gaolingongshan and to known some unexplored areas on the mountain. Major finds included the logging and exploration of 8 new caves on the territory of the mountain and its vicinity. The most significant caves which the team explored were far from the main exploration area close to Kunming city. Among them are the longest caves explored during the expedition Yenze Dong (Swallow cave) – 1514 m and Da Shi Dong (Big rock cave) - 1394 m. During the expedition were mapped 11 caves with a total length of the galleries 4972 m and depth 429.60 m (-318.2/+ 89.4)
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Expédition 1

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