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    AMS-14C Chronology of a Lacustrine Sequence from Lake Langano (Main Ethiopian Rift): Correction and Validation Steps in Relation with Volcanism, Lake Water and Carbon Balances

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    Author
    Gibert, Elisabeth
    Travi, Yves
    Massault, Marc
    Tiercelin, Jean-Jacques
    Chernet, Tesfaye
    Issue Date
    2002-01-01
    Keywords
    paleohydrology
    Ethiopian Rift
    Lake Langano
    paleolimnology
    Ziway Shala Basin
    lake sediments
    East Africa
    lacustrine environment
    residence time
    accelerator mass spectra
    reconstruction
    mass spectra
    spectra
    Africa
    isotope ratios
    Holocene
    correlation
    volcanism
    chronology
    Pleistocene
    upper Pleistocene
    sediments
    Cenozoic
    Quaternary
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    C 13 C 12
    stable isotopes
    absolute age
    geochemistry
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    Citation
    Gibert, E., Travi, Y., Massault, M., Tiercelin, J.-J., & Chernet, T. (2002). AMS-14C Chronology of a lacustrine sequence from Lake Langano (Main Ethiopian Rift): Correction and validation steps in relation with volcanism, lake water and carbon balances. Radiocarbon, 44(1), 75-92.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654436
    DOI
    10.1017/S0033822200064699
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Located in the Ziway-Shala Basin of the Main Ethiopian Rift, Lake Langano is part of an asymmetric half-graben, defined by a series of north-northeast-trending faults in the tectonically active zone of the rift. A 15-m deep succession of organic homogeneous muds, silts, bioclastic sands, and pyroclastic layers was cored in 1994. The definition of a certified radiocarbon chronology on these deposits required the indispensable establishment of modern hydrological and geochemical balances. The isotopic contents of the total dissolved inorganic carbon (TDIC) of surface water clearly show the influence of a deep CO2 rising along the main fault crossing the lake basin. The 5.8 pMC disequilibrium existing in 1994 with the atmosphere likely produces the aging of authigenic materials developing at the lake surface. However, with a mean residence time of approximately 15 years, this apparent 14C aging of Lake Langano water still integrates the 14C produced by the nuclear tests in the 1960s. Reconstructing the natural 14C activity of the lake TDIC allows for the quantification of the deep CO2 influence, and for the correction of AMS-14C datings performed along the core. The correction of the AMS14C chronology defined on Lake Langano allows for a better understanding of paleohydrological changes at a regional scale for at least the last 12,700 cal BP.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200064699
    Scopus Count
    Collections
    Radiocarbon, Volume 44, Number 1 (2002)

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