Paleolimnological evidence for the onset and termination of glacial aridity from Lake Tanganyika, Tropical East Africa

Anna A. Felton, James M. Russell, Andrew Cohen, Mark E. Baker, John T. Chesley, Kiram E. Lezzar, Michael M. McGlue, Jeffrey S. Pigati, Jay Quade, J. Curt Stager, Jean Jacques Tiercelin

Research output: Contribution to journalArticle

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Abstract

Geochemical and sedimentological data in a continuous 60,000-year sediment core record from the Kalya horst region of central Lake Tanganyika provide a detailed history of paleoclimate-mediated weathering and overflow events from upstream Lake Kivu. Univariate (elemental profiles), bivariate (elemental ratios) and multivariate analyses of chemical trends show variations between the dry Late Pleistocene (32-18 ka cal yr BP) and the wetter conditions that both preceded and post-date that interval. This record places important new constraints on the timing of aridity in East Africa during the high-latitude Last Glacial Maximum (LGM) based on significant decreases in magnetic susceptibility and soluble cation concentrations coinciding with biogenic silica. Elemental indicators in the oldest portion of the sedimentary record (60-50 ka cal yr BP) characterize this interval as a comparatively wet period, similar to modern conditions. Our record demonstrates that the ensuing transition toward arid conditions in tropical Africa during high-latitude glaciation was a two staged event with intermediate levels of aridity occurring from 50-32 ka cal yr BP followed by intense aridity from 32-18 ka cal yr BP. The initiation of inflow from upstream Lake Kivu into Lake Tanganyika is evidenced at 10.6 ka cal yr BP through its influence on both elemental profiles (Mg, Ca) and through its effect on 87Sr/86Sr. Increases in elemental (Mg, Ca, Sr) concentrations coincide with the timing of the Lake Kivu overflow. Metal geochemistry suggests that the overflow from Lake Kivu into Lake Tanganyika may have ceased between 8 and 6 ka cal yr BP, suggesting a period of Middle Holocene aridity in East Africa.

Original languageEnglish (US)
Pages (from-to)405-423
Number of pages19
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume252
Issue number3-4
DOIs
StatePublished - Sep 3 2007

Fingerprint

Lake Tanganyika
dry environmental conditions
aridity
Eastern Africa
lake
lakes
wet environmental conditions
geochemistry
glaciation
weathering
silica
cations
horst
metals
magnetic susceptibility
East Africa
Last Glacial Maximum
paleoclimate
sediment core
sediments

Keywords

  • Africa
  • Lake Tanganyika
  • Last Glacial Maximum
  • Late Pleistocene paleoclimate
  • Paleolimnology
  • Rift lakes

ASJC Scopus subject areas

  • Palaeontology

Cite this

Paleolimnological evidence for the onset and termination of glacial aridity from Lake Tanganyika, Tropical East Africa. / Felton, Anna A.; Russell, James M.; Cohen, Andrew; Baker, Mark E.; Chesley, John T.; Lezzar, Kiram E.; McGlue, Michael M.; Pigati, Jeffrey S.; Quade, Jay; Curt Stager, J.; Tiercelin, Jean Jacques.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 252, No. 3-4, 03.09.2007, p. 405-423.

Research output: Contribution to journalArticle

Felton, AA, Russell, JM, Cohen, A, Baker, ME, Chesley, JT, Lezzar, KE, McGlue, MM, Pigati, JS, Quade, J, Curt Stager, J & Tiercelin, JJ 2007, 'Paleolimnological evidence for the onset and termination of glacial aridity from Lake Tanganyika, Tropical East Africa', Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 252, no. 3-4, pp. 405-423. https://doi.org/10.1016/j.palaeo.2007.04.003
Felton, Anna A. ; Russell, James M. ; Cohen, Andrew ; Baker, Mark E. ; Chesley, John T. ; Lezzar, Kiram E. ; McGlue, Michael M. ; Pigati, Jeffrey S. ; Quade, Jay ; Curt Stager, J. ; Tiercelin, Jean Jacques. / Paleolimnological evidence for the onset and termination of glacial aridity from Lake Tanganyika, Tropical East Africa. In: Palaeogeography, Palaeoclimatology, Palaeoecology. 2007 ; Vol. 252, No. 3-4. pp. 405-423.
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AU - Baker, Mark E.

AU - Chesley, John T.

AU - Lezzar, Kiram E.

AU - McGlue, Michael M.

AU - Pigati, Jeffrey S.

AU - Quade, Jay

AU - Curt Stager, J.

AU - Tiercelin, Jean Jacques

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N2 - Geochemical and sedimentological data in a continuous 60,000-year sediment core record from the Kalya horst region of central Lake Tanganyika provide a detailed history of paleoclimate-mediated weathering and overflow events from upstream Lake Kivu. Univariate (elemental profiles), bivariate (elemental ratios) and multivariate analyses of chemical trends show variations between the dry Late Pleistocene (32-18 ka cal yr BP) and the wetter conditions that both preceded and post-date that interval. This record places important new constraints on the timing of aridity in East Africa during the high-latitude Last Glacial Maximum (LGM) based on significant decreases in magnetic susceptibility and soluble cation concentrations coinciding with biogenic silica. Elemental indicators in the oldest portion of the sedimentary record (60-50 ka cal yr BP) characterize this interval as a comparatively wet period, similar to modern conditions. Our record demonstrates that the ensuing transition toward arid conditions in tropical Africa during high-latitude glaciation was a two staged event with intermediate levels of aridity occurring from 50-32 ka cal yr BP followed by intense aridity from 32-18 ka cal yr BP. The initiation of inflow from upstream Lake Kivu into Lake Tanganyika is evidenced at 10.6 ka cal yr BP through its influence on both elemental profiles (Mg, Ca) and through its effect on 87Sr/86Sr. Increases in elemental (Mg, Ca, Sr) concentrations coincide with the timing of the Lake Kivu overflow. Metal geochemistry suggests that the overflow from Lake Kivu into Lake Tanganyika may have ceased between 8 and 6 ka cal yr BP, suggesting a period of Middle Holocene aridity in East Africa.

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