ORBi: Willems Luc - Karst in granitic rocks, South Cameroon: Cave genesis and silica and taranakite speleothems

Reference : Karst in granitic rocks, South Cameroon: Cave genesis and silica and taranakite speleoth...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/96885

Title :	Karst in granitic rocks, South Cameroon: Cave genesis and silica and taranakite speleothems
Language :	English
Author, co-author :	Willems, Luc [Université de Liège - ULg > Département de géologie > Pétrologie sédimentaire >]
	Compère, Philippe [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement >]
	Hatert, Frédéric [Université de Liège - ULg > Département de géologie > Minéralogie et cristallochimie >]
	Boulvain, Frédéric [Université de Liège - ULg > Département de géologie > Pétrologie sédimentaire >]
	Vicat, Jean-Paul [ > > ]
	Pouclet, André [ > > ]
	Ek, Camille [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
Publication date :	2002
Journal title :	Terra Nova
Publisher :	Blackwell Publishing
Volume :	14
Issue/season :	5
Pages :	355-362
Audience :	International
ISSN :	0954-4879
City :	Oxford
Country :	United Kingdom
Keywords :	[en] karst ; granit ; speleothem ; opal ; taranakite
Abstract :	[en] A cave in granitic rocks was studied in Mezesse, South Cameroon. Coralloid speleothems, draperies and dissolution traces on the cave walls attest to its truly karstic nature. The speleothems consist of microlayers of opal and taranakite (K,NH4)Al3(PO4)3(OH).9H2O. They indicate a significant mobilization of silica, Al and K from granite during the formation of the cave. Identification of silicified bacteria in the speleothems layers suggests a possible role of these micro-organisms in silica deposition. The presence of taranakite and of silicified organic remains within the speleothems lead to a better understanding of the genesis of the cave.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/96885

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