Existence of karsts into silicated non-carbonated crystalline rocks in Sahelian and Equatorial Africa, hydrogeological implications

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Publication Date

7-1-2002

Publication Title

Bulletin de la Société Géologique de France

Volume Number

173

Issue Number

4

Abstract

Various cavities studied in western Niger and South Cameroon show the existence of important karstic phenomena into metagabbros and gneisses. These large-sized caves resulted from generalized dissolution of silicate formations in spite of their low solubility. Karstification is produced by deep hydrous transfer along lithological discontinuities and fracture net works. The existence of such caves has major implications in geomorphology, under either Sahelian and Equatorial climate, and in hydrogeology and water supply, particularly in the Sahel area.

Keywords

Karst, Caves, Geomorphology, Hydrogeology, Water supply

Document Type

Article

Digital Object Identifier (DOI)

https://doi.org/10.2113/173.4.337

Language

English; French

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