Lake Chad sedimentation and environments during the late Miocene and Pliocene: New evidence from mineralogy and chemistry of the Bol core sediments
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- 作者：Abderamane Moussaa ; Alice Novellob ; c ; novelloalice@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Anne-Elisabeth Lebatardc ; Alain Decarreaud ; Claude Fontained ; Doris Barbonic ; Florence Sylvestrec ; Didier L. Bourlè ; sc ; Christine Paillè ; sc ; Guillaume Buchetc ; Philippe Duringere ; Jean-Franç ; ois Ghiennee ; Jean Maleyf ; Jean-Charles Mazurc ; Claude Roquine ; Mathieu Schustere ; Patrick Vignaudg ; Michel Brunetg ; h
- 关键词：Lake Chad ; Miocene&ndash ; Pliocene ; Fe-beidellite ; Vertisol ; Sedimentation rate
- 刊名：Journal of African Earth Sciences
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：118
- 期：Complete
- 页码：192-204
- 全文大小：2395 K
文摘
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Sediments are dominated by detrital clays, more or less mixed with silt and diatomite.
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These sediments indicate a (recurrent) lake between 6.7 and 2.4 Ma at Bol.
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The dominant clay is a Fe-beidellite, a feature of present-day vertisols.
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Vertisols near Bol suggest a Sudanian-like climate between 6.4 and 2.4 Ma.
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Changes in sedimentation rate suggest an alternating of wet and dry periods.