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Climate-induced fluvial dynamics in tropical Africa around the last glacial maximum?

Published online by Cambridge University Press:  20 January 2017

Mark Sangen*
Affiliation:
Institute of Physical Geography, Goethe-University, Campus Riedberg, Altenhoefer Allee 1, 60438 Frankfurt am Main, Germany
Katharina Neumann
Affiliation:
Institute of Archaeological Sciences, Department of Pre- and Protohistory, Goethe-University, Grueneburgplatz 1, 60323 Frankfurt am Main, Germany
Joachim Eisenberg
Affiliation:
Institute of Physical Geography, Goethe-University, Campus Riedberg, Altenhoefer Allee 1, 60438 Frankfurt am Main, Germany
*
Corresponding author. Fax: + 49 69 798 40169. E-mail addresses:m.sangen@em.uni-frankfurt.de (M. Sangen), MarkSangen@web.de(M. Sangen), k.neumann@em.uni-frankfurt.de (K. Neumann), j.eisenberg@em.uni-frankfurt.de (J. Eisenberg).

Abstract

The alluvia of the Ntem, Nyong and Sanaga fluvial systems in southern Cameroon recorded repeated fluvial activity fluctuations during the Late Pleistocene, including the last glacial maximum (LGM), the beginning of the African Humid Period and the northern hemispheric Bølling-Allerød. We applied a multi-proxy approach on alluvial stratigraphies dated between 22.4 and 13.0 cal ka BP, including remote sensing, sedimentological and morphogenetic methods, phytoliths, sponge spicules, 14C and δ13C data. A distinct NE–SW gradient of landscape and fluvial dynamics around the LGM can be drawn, with evidence for the persistence of extended fluvial rainforest refuges only in the Ntem catchment. The Sanaga and Nyong catchment areas were characterized by frequent channel migrations, floodplain reorganization and unstable vegetation subject to fire, including grasslands, woodlands, and gallery forests with bamboo thickets. In spite of increasing rainfall after 16.4 cal ka BP, persisting landscape instability played the major role for fluvial system dynamics, floodplain transformations and vegetation development until 13.0 cal ka BP, before a general landscape stabilization and rainforest expansion set in at the beginning of the Holocene.

Type
Research Article
Copyright
University of Washington

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Footnotes

1 Fax: + 49 69 798 32104.
2 Fax: + 49 69 798 40169.

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