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    Dating of Groundwater Recharge in Two Small Adjacent Aquifers in Israel and Their Initial 14C Activities

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    Author
    Guttman, J.
    Kronfeld, J.
    Carmi, I.
    Issue Date
    2011-01-01
    
    Metadata
    Show full item record
    Citation
    Guttman, J., Kronfeld, J., & Carmi, I. (2011). Dating of groundwater recharge in two small aquifers in Israel and their initial 14C activities. Radiocarbon, 53(1), 137-149.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654189
    DOI
    10.1017/S003382220003441X
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Radiocarbon and tritium determinations were carried out in 2 adjacent small aquifers in Israel. These aquifers have small storage capacities and good hydraulic properties. Darcy calculations suggest that the aquifers contain young waters, ~50 yr in age. 14C concentrations in the Pleistocene aquifer are between 23-60 pMC, with the lowest activity related to contamination by petroleum-based fertilizers with no 14C. 14C concentrations in the Judea Group aquifer range from 62 to 95 pMC. An apparent difference of ~1000 yr is indicated for the average recharge age between the 2 aquifers. The tritium data suggests that the water in both aquifers is quite young. The 1000-yr difference is an artifact of initial isotopic fractionation differences through the unsaturated zone as established elsewhere for these 2 aquifers. When these individual fractionation factors (0.54 for the Pleistocene and 0.62 for the Judea Group) are used, it is revealed that both aquifers contain young water, in agreement with the Darcy calculation, which was recharged at the beginning of the period of thermonuclear atmospheric testing in the early 1960s.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S003382220003441X
    Scopus Count
    Collections
    Radiocarbon, Volume 53, Number 1 (2011)

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