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“East Yunnan 1991” - Geological and speleological reconaissance of the East Yunnan Karst (P.R. China): preliminary results of a field trip between 17.12.1990 and 3.01.1991

Titre“East Yunnan 1991” - Geological and speleological reconaissance of the East Yunnan Karst (P.R. China): preliminary results of a field trip between 17.12.1990 and 3.01.1991
Type de publicationBook
Year of Publication1991
AuteursDusar, M, Shouyue, Z
Series TitleGeological Survey of Belgium Professional Paper
Volume248
Number of Pages40
PublisherMinisterie van Economische Zaken, Belgische Geologische Dienst
VilleJennerstreet 13, 1000 Brussels
ISBN Number0378-0902
Mots-cléscarbonates, caves, China, karst, speleology, Yunnan
Résumé

A speleological reconnaissance trip on the high plateau of East Yunnan (China) (average altitude 1900 m) revealed the presence of a highly diversified karst. The geological substratum consists of Sinian (Upper Precambrian) to Jurassic sedimentary rocks deposited near the western margin of the Yangtze platform. Carbonates are widespread and variable incomposition and texture. Karst phenomena are developed in Sinian, Devonian, Carboniferous, Permian and Triassic strata. Modern karst evolution has been determined by two factors: Himalayan uplift and climatic differentiation. The uplift and subsequent erosion has resulted in the destruction of the original tropical tower karst landscape and the replacement by a karst plain-hilly plateau karst on the East Yunnan plateau or by a mountain plateau-canyon type of karst on the Yunnan-Guizhou border region. The former karst type shows a transition to the karst plain-tower karst developed in tropical Southeast Yunnan. Several cave systems on the East Yunnan plateau were selected for further exploration and study. These generally correspond to allogenic multistorey underground rivers with marked differences in maturity and represent a transect between varied climate-induced karst morphologies.

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