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Sedimentation changes in a complete Holocene lacustrine record in the Sahara: Varve thickness, seasonality and event layers – Problems of identification, interpretation and chronology.

Abstract

Lake Yoa (19.03°N, 20.31°E, 380 m a.s.l.) is a groundwater-fed lake in the hyperarid
eastern Sahara halfway between the Tibesti Mountains and the Ennedi plateau.
Kröpelin et al. (2008) revealed that the bottom sediments contain a unique archive of
climatic and environmental change in the Earth´s major desert. The 7.5 m sediment
record of OUNIK03/04 which covers 6,100 years has been extended to a maximum
drill depth of 15.7 m during a 2010 coring campaign within the framework of the
Collaborative Research Center (CRC) 806 “Our Way to Europe - Culture-
Environment Interaction and Human Mobility in the Late Quaternary”. The long core
(Co1240) contains the first complete terrestrial record of climate variations from the
onset of the early Holocene humid period to the present. Sediments mainly consist of
fine to very fine laminae in the millimeter to sub-millimeter range and bedded layers
up to 2 cm in thickness. They expose shifts in thickness but also changes in clastic
and geochemical composition. These differences and the occurrence of a few event
layers in the lower part implicate significant changes during lake basin evolution as
well as problems in varve counting. Here we present our interpretation of varve
formation in Lake Yoa and an initial varve chronology in combination with 14C ages
including an overview on applied methods and their usefulness with the Co1240
record.

Resources

Bibliography

Kröpelin, S., Karls, J., Kuper, J., Melles, M. (2012): Sedimentation changes in a complete Holocene lacustrine record in the Sahara: varve thickness, seasonality and event layers - Problems of identification, interpretation and chronology. In: Zolitschka, B. (ed.) 3rd Workshop of the PAGES Varves Working Group, Manderscheid, Germany, March 20-25, 2012, Program and Abstracts, Terra Nostra 2012/1: 51

Authors Kröpelin, S. and Karls, J. and Kuper, J. and Melles, M.
Type conference
Title Sedimentation changes in a complete Holocene lacustrine record in the Sahara: Varve thickness, seasonality and event layers – Problems of identification, interpretation and chronology.
Citation Kröpelin, S., Karls, J., Kuper, J., Melles, M. (2012): Sedimentation changes in a complete Holocene lacustrine record in the Sahara: varve thickness, seasonality and event layers - Problems of identification, interpretation and chronology. In: Zolitschka, B. (ed.) 3rd Workshop of the PAGES Varves Working Group, Manderscheid, Germany, March 20-25, 2012, Program and Abstracts, Terra Nostra 2012/1: 51
URL http://pages-igbp.org/products/meeting-products/1048-3rd-varves-working-group-workshop-abstract-volume
Year 2012
Volume 2012/1
Pages 51
Publisher GeoUnion Alfred-Wegener-Stiftung
Series Terra Nostra
Organization Schriften der GeoUnion Alfred-Wegener-Stiftung
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Spatial {"type":"Point","coordinates":[20.5,19.05]}
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