Radiogenic helium in shallow groundwater within a clay till, southwestern Ontario
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Abstract
Profiles of 4He in pore water were measured in clay aquitards in SW Ontario. The 4He distributions are consistent with groundwater velocities that are <6 mm yr−1, and thus diffusion is the dominant transport mechanism for 4He. Modeling indicates that the effective diffusion coefficient for 4He is 6.3 ± 1.6 × 10−6 cm2 s−1. Furthermore, the profiles are consistent with the internal release of 4He from aquitard sediments at a rate of 0.03–0.13 μcc(STP) kg−1 yr−1. These rates are also consistent with laboratory release experiments and, on average, are 600 times greater than the production of 4He from U/Th decay. Modeling and the ratio of 21Ne to 4He within the sediments indicate that although the aquitards were deposited about 13 kA BP, the sediments released >70% of initial 4He for 50 to 60 kA prior to incorporation into the till.
Suggested Citation
Sheldon, A.L., Solomon, D., Poreda, R.J., and Hunt, A.G., 2003, Radiogenic helium in shallow groundwater within a clay till, southwestern Ontario: Water Resources Research, v. 39, no. 12, Article 1331; 12 p., https://doi.org/10.1029/2002WR001797.
ISSN: 1944-7973 (online)
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Radiogenic helium in shallow groundwater within a clay till, southwestern Ontario |
| Series title | Water Resources Research |
| DOI | 10.1029/2002WR001797 |
| Volume | 39 |
| Issue | 12 |
| Publication Date | December 03, 2003 |
| Year Published | 2003 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | Article 1331; 12 p. |