Dating of Groundwater Recharge in Two Small Adjacent Aquifers in Israel and Their Initial 14C Activities
| Autor: | I Carmi, Joel Kronfeld, J Guttman |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Hydrology
010506 paleontology Archeology geography geography.geographical_feature_category 060102 archaeology Aquifer 06 humanities and the arts Groundwater recharge 01 natural sciences law.invention law Vadose zone Depression-focused recharge General Earth and Planetary Sciences 0601 history and archaeology Radiocarbon dating Quaternary Groundwater Geology 0105 earth and related environmental sciences Surficial aquifer |
| Zdroj: | Radiocarbon. 53:137-149 |
| ISSN: | 1945-5755 0033-8222 |
| DOI: | 10.1017/s003382220003441x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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