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    Radiometric Dating of Young and Old Calcrete

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    Author
    Geyh, Mebus A.
    Eitel, Bernhard
    Issue Date
    1998-01-01
    Keywords
    Southern Africa
    Th U
    diagenesis
    Tertiary
    calcrete
    cementation
    genesis
    Khorixas Namibia
    Namibia
    thermoluminescence
    wind transport
    Africa
    Cenozoic
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    absolute age
    sedimentary rocks
    carbonate rocks
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    Citation
    Geyh, M. A., & Eitel, B. (1998). Radiometric dating of young and old calcrete. Radiocarbon, 40(2), 795-802.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.
    URI
    http://hdl.handle.net/10150/654621
    DOI
    10.1017/S0033822200018749
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    To obtain a better understanding of the relationship between calcrete genesis and the results of different absolute dating methods, thermoluminescence (TL), radiocarbon (14C) and uranium/thorium (U/Th) were applied to coeval samples taken from a very young calcrete profile in Namibia. The methodically different ages reflect the characteristics of the applied dating methods, the genetics of calcrete and different events of calcrete genesis. The conventional 14C ages and the TL dates cover the last 50 ka, while the corresponding U/Th dates of coeval samples are many times larger. Uranium-series dates are not related to the deposition of the host material or to its cementation if the ages are smaller than ca. 120 ka. The TL clock is set to zero during eolian transport and the corresponding radiometric ages of the quartz and feldspar grains date the time of their deposition. The 14C ages of the cement correspond, on the other hand, to a time shortly after the onset of the cementation and long before its termination. In the case of very old calcrete, the mixture of young and old cement results in ambiguous ages if they cannot be confirmed by an independent technique.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200018749
    Scopus Count
    Collections
    Radiocarbon, Volume 40, Number 2 (1998)

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