Journal of Paleolimnology

, Volume 58, Issue 3, pp 373–390 | Cite as

Paleolimnological features of a mega-lake phase in the Makgadikgadi Basin (Kalahari, Botswana) during Marine Isotope Stage 5 inferred from diatoms

  • Mareike Schmidt
  • Markus Fuchs
  • Andrew C. G. Henderson
  • Annette Kossler
  • Melanie J. Leng
  • Anson W. Mackay
  • Elisha Shemang
  • Frank Riedel
Original paper

Abstract

The Makgadikgadi–Okavango–Zambezi basin (MOZB) is a structural depression in the south-western branch of the East African Rift System of the northern and middle Kalahari, central southern Africa. In the present day, the mainly dry subbasins of the MOZB are part of a long-lived lacustrine system that has likely existed since Early Pleistocene and from which an extant freshwater fish radiation emerged seeding all major river systems of southern Africa. During hydrologically favourable periods the subbasins were connected as a single mega-lake termed Lake Palaeo-Makgadikgadi. Previous geomorphological studies and OSL dates have provided evidence for repeated mega-lake periods since approximately 300 ka. The environmental and climatic implications of such large scale late Quaternary lake-level fluctuations are controversial, with the duration of mega-lake phases poorly constrained. Here, we present the first evidence for a Marine Isotope Stage (MIS) 5 mega-lake period (about 935–940 m a.s.l.) reconstructed from a diatom-rich, 30-cm-thick lacustrine sediment section, exposed close to a palaeo-shoreline of the Makgadikgadi Basin. Based upon the environmental setting and in comparison with sedimentation rates of other similar lake environments, we tentatively estimated that the highstand lasted approximately 1 ka during MIS 5d–b. The 30-cm section was sampled in 0.5-cm steps. Diatom species diversity ranges from 19 to 30 through the section. The dominant species are Pseudostaurosira brevistriata, Rhopalodia gibberula, Cyclotella meneghiniana and Epithemia sorex. The total of 60 sediment samples provide us with a record at decadal to bi-decadal resolution. Based on diatom assemblages and their oxygen isotope composition (δ18O) we infer an alkaline and mostly oligohaline lake with shallow water conditions prevailing in MIS 5, and is potentially analogous to a Heinrich event. The climate over southern Africa during MIS 5 has been considered very arid but the hydromorphological context of our sediment section indicates that we captured a mega-lake period providing evidence that short-term excursions to significantly higher humidity existed. A hydrologically more favourable environment during MIS 5 than formerly presumed is in line with the early human occupation of the Kalahari.

Keywords

Late Pleistocene Southern Africa Lake Palaeo-Makgadikgadi highstand Diatoms Stable oxygen isotopes Heinrich event 

Supplementary material

10933_2017_9984_MOESM1_ESM.pdf (114 kb)
Supplementary material 1 (PDF 114 kb)
10933_2017_9984_MOESM2_ESM.pdf (242 kb)
Supplementary material 2 (PDF 242 kb)
10933_2017_9984_MOESM3_ESM.tif (11.2 mb)
Supplementary material 3 (TIFF 11439 kb)

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Institute of Geological SciencesFreie Universität BerlinBerlinGermany
  2. 2.Department of GeographyUniversität GießenGiessenGermany
  3. 3.School of Geography, Politics and SociologyNewcastle UniversityNewcastle upon TyneUK
  4. 4.NERC Isotope Geosciences FacilityBritish Geological SurveyNottinghamUK
  5. 5.Centre for Environmental GeochemistryUniversity of NottinghamNottinghamUK
  6. 6.Department of Geography, Environmental Change Research CentreUCLLondonUK
  7. 7.Department of Earth and Environmental SciencesBotswana International University of Science and TechnologyPalapyeBotswana

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