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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/4534

Title: Using the 14C Bomb Pulse to Date Young Speleothems
Authors: Hodge, E
McDonald, J
Fischer, M
Redwood, D
Hua, Q
Levchenko, V
Drysdale, R
Waring, C
Fink, D
Keywords: CARBON 14
speleothems
ISOTOPE DATING
RADIOCHEMICAL ANALYSIS
AQUIFERS
SOILS
Issue Date: 1-Apr-2011
Publisher: University of Arizona
Citation: Hodge, E., McDonald, J., Fisher, M., Redwood, D., Hua, Q., Levchenko, V., Drysdale, R., Waring, C., Fink, D. (2011).Using the 14C Bomb Pulse to Date Young Speleothems. Radiocarbon, 52(2), 345-357.
Abstract: Many factors may influence the radiocarbon age results of lacustrine sediments, among which the hardwater effect is particularly important. Daihai Lake is a closed lake located in the semi-arid region of Inner Mongolia, China. High concentrations of (HCO3)- and (CO3)2- and high pH values in the lake water imply that there is a hardwater effect when using bulk lacustrine sediment samples for 14C dating. To correct the apparent 14C age, we present a pilot study based on a series of 14C ages of lake surface sediment, lake water, submerged aquatic plant (Myriophyllum), fish bone (Cyprinus carpio), and surface soil samples from and around Daihai Lake. Assuming that the relationship between the 14C/12C ratio of DIC and of atmospheric CO2 was constant (at 0.816), the hardwater effect ages calculated for the past 8000 yr would have varied from 949 to 1788 yr. Together with the reservoir effect and soil organic matter input, the hardwater effect is a major factor causing changes in apparent age when using bulk organic matter for 14C dating. © 2011, University of Arizona.
URI: https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3468
http://apo.ansto.gov.au/dspace/handle/10238/4534
ISSN: 0033-8222
Appears in Collections:Journal Articles

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