Derivation of detrital rutile in the Yaoundé region from the Neoproterozoic Pan-African belt in southern Cameroon (Central Africa)

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• 作者：Henrik Stendal ; Sadrack F&#xe9 ; lix Toteu ; Robert Frei ; Joseph Penaye ; Urbain Olivier Njel ; Jean Bassahak ; Jean Nni ; Boniface Kankeu ; Vincent Ngako and Joseph Victor Hell
• 关键词：Pan-African Belt ; Rutile ; Yaound&#xe9 ; Group ; Cameroon ; Pb-isotopes
• 刊名：Journal of African Earth Sciences
• 出版年：2006
• 期刊代码：38_08995362
• 类别：ear
• 出版时间：April 2006
• 卷：44
• 期：4-5
• 页码：443-458
• 文件大小：915 K

摘要

Rutile, as an important component in alluvial or eluvial heavy mineral deposits, is known in southern Cameroon. These deposits are underlain by the Neoproterozoic low- to high-grade Yaoundé Group. Geochemical, thermometric, fluid inclusion and Pb isotopic studies of the rutile from alluvial and eluvial concentrates and from medium-grade micaschist from the nearby Yaoundé region permit the following conclusions: (1) alluvial and eluvial rutile of the Yaoundé region are derived from the degradation of metapelites, metamafic rocks and pegmatites of the nearby Yaoundé Group; (2) rutile in the Yaoundé Group formed during the Pan-African metamorphism, or was inherited as detrital rutile from a 900 Ma source. The study also shows that the rutile can be used to trace the history of the Pan-African belt north of the Congo craton.