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Book Chapter

Neoproterozoic sequences of the West Congo and Lindi/Ubangi Supergroups in the Congo Craton, Central Africa

By
Jenny Tait
Jenny Tait
School of Geosciences, University of Edinburgh, Edinburgh EH9 3JW, UK
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Franck Delpomdor
Franck Delpomdor
Department of Earth Sciences and Environmental Sciences, University of Brussels, 1050 Brussels, Belgium
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Alain Préat
Alain Préat
Department of Earth Sciences and Environmental Sciences, University of Brussels, 1050 Brussels, Belgium
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Luc Tack
Luc Tack
Department of Geology and Mineralogy, Royal Museum for Central Africa (RMCA), Tervuren, Belgium
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Gijs Straathof
Gijs Straathof
School of Geosciences, University of Edinburgh, Edinburgh EH9 3JW, UK
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Valentin Kanda Nkula
Valentin Kanda Nkula
Département des Sciences de la Terre, Faculté des Sciences, Université de Kinshasa (UNIKIN), Democratic Republic of the Congo
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Published:
January 01, 2011

Abstract

The focus of this chapter is the West Congo Supergroup in the West Congo Belt (WCB), which extends along the western margin of the Congo Craton from Gabon in the north to northern Angola in the south, and the Lindi/Ubangi Supergroup of the Lindian and Fouroumbala – Bakouma Basins exposed on the northern margin of the craton. In both regions, up to two distinct diamictite horizons have been recognized, the younger of which is often associated with carbonate rocks. Geochronological constraints are generally rather poor, many of the deposits lack modern sedimentological analysis, and the glacial versus non-glacial genesis of the diamictites is a matter of debate in the literature. However, recent studies suggest a periglacial influence of diamictite deposition, particularly for the sequences in the WCB. The stratigraphy of the various basins is described, available geochemical and geochronological information collated, and recent work regarding the periglacial nature of the diamictites discussed. Finally, an updated chronostratigraphic correlation between the basins is presented. However, much more work is required, particularly in the Neoproterozoic basins on the northern margin of the Congo Craton, and more accurate geochronological constraints are required before the Neoproterozoic palaeogeography and depositional environments of the western and northern Congo Craton can be fully understood.

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Contents

Geological Society, London, Memoirs

The Geological Record of Neoproterozoic Glaciations

Emmanuelle Arnaud
Emmanuelle Arnaud
University of Guelph, Canada
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Galen P. Halverson
Galen P. Halverson
McGill University, Canada
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Graham Shields-Zhou
Graham Shields-Zhou
University College London, UK
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Geological Society of London
Volume
36
ISBN electronic:
9781862394117
Publication date:
January 01, 2011

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