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    Calculation of Past Dead Carbon Proportion and Variability by the Comparison of AMS 14C and TIMS U/Th Ages on Two Holocene Stalagmites

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    Author
    Genty, Dominique
    Massault, Marc
    Gilmour, Mabs
    Baker, Andy
    Verheyden, Sophie
    Keppens, Eddy
    Issue Date
    1999-01-01
    Keywords
    Thermal Infrared Multispectral Scanner
    stalagmites
    age
    Th U
    accelerator mass spectra
    calibration
    solution features
    speleothems
    accuracy
    mass spectra
    tree rings
    isotope ratios
    Holocene
    Cenozoic
    Quaternary
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    C 13 C 12
    stable isotopes
    absolute age
    processes
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    Citation
    Genty, D., Massault, M., Gilmour, M., Baker, A., Verheyden, S., & Kepens, E. (1999). Calculation of past dead carbon proportion and variability by the comparison of AMS 14C and TIMS U/Th ages on two Holocene stalagmites. Radiocarbon, 41(3), 251-270.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654452
    DOI
    10.1017/S003382220005712X
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Twenty-two radiocarbon activity measurements were made by accelerator mass spectrometry (AMS) on 2 Holocene stalagmites from Belgium (Han-stm lb) and from southwest France (Vil-stm lb). Sixteen thermal ionization mass spectrometric (TIMS) U/Th measurements were performed parallel to AMS analyses. The past dead carbon proportion (dcp) due to limestone dissolution and old soil organic matter (SOM) degradation is calculated with U/Th ages, measured calcite 14C activity and atmospheric 14C activity from the dendrochronological calibration curves. Results show that the dcp is different for the 2 stalagmites: between 10,800 and 4780 yr from present dcp = 17.5% (sigma = 2.4; n = 10) for Han-stm lb and dcp = 9.4% (sigma = 1.6; n = 6) between 3070 and 520 yr for Vil-stmlb. Despite a broad stability of the dcp during the time ranges covered by each sample, a slight dcp increase of about 5.0% is observed in the Han-stmlb sample between 8500 and 5200 yr. This change is synchronous with a calcite delta-13C increase, which could be due to variation in limestone dissolution processes possibly linked with a vegetation change. The dcp and delta-13C of the 2 studied samples are compared with 5 other modern stalagmites from Europe. Results show that several factors intervene, among them: the vegetation type, and the soil saturation leading to variable dissolution process systems (open/closed). The good correlation (R2 = 0.98) between the U/Th ages and the calibrated 14C ages corrected with a constant dcp validates the 14C method. However, the dcp error leads to large 14C age errors (i.e. 250-500 yr for the period studied), which is an obstacle for both a high-resolution chronology and the improvement of the 14C calibration curves, at least for the Holocene.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S003382220005712X
    Scopus Count
    Collections
    Radiocarbon, Volume 41, Number 3 (1999)

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