Dawn Lake (Athabasca)
Saskatchewan, eastern margin of the Athabasca Basin, Canada
UraniumU
- Type
- Proterozoic unconformity uranium
Uranium ore sample from the Queen's University collection analysed by Uvarova et al. (2014) for δ238U and δ234U. Unconformity deposit (Clarke and Fogwill, 1986); δ238U of +0.37 to +0.45 ‰ and δ234U of -31 to +5 ‰. Both samples also appear in Voinot et al. (2024), as "defenial lake" and "downlake". Coordinates not published.
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.17 ‰ | 1 | low-grade uranium ore (unconformity contact, deposit recorded as "defenial lake") Single analysis; per-sample uncertainty not published; full-procedure duplicate at -0.16; sample DF22-902 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.1. Unconformity-contact (Proterozoic unconformity); average age used 1850 Ma; 1.79 % U, 67.53 µg/g Tl, 622.08 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −0.21 ‰ | 1 | uranium ore (basement-hosted, deposit recorded as "downlake") Single analysis; per-sample uncertainty not published; full-procedure duplicate at -0.24; sample 11A-208-169.2 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 8.42 % U, 31.89 µg/g Tl, 1467.58 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 0.45 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample DF22-902, Dawn Lake; bracketing-only δ238U at +0.43; 238U/235U of 137.899; about -0.15 ‰ after removing the 0.60 ‰ offset specific to this study; same sample as Voinot et al. (2024), published at -0.17 ‰. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.37 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample 11A-208-169.2, Dawn Lake; bracketing-only δ238U at +0.44; 238U/235U of 137.888; about -0.23 ‰ after removing the 0.60 ‰ offset specific to this study; same sample as Voinot et al. (2024), published at -0.21 ‰. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… |
δ234U in ‰ (per mil) Values of the same system
Standard : équilibre séculaire
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −33 ‰ | 1 | low-grade uranium ore (unconformity contact, deposit recorded as "defenial lake") Single analysis; per-sample uncertainty not published; full-procedure duplicate at -29.0; sample DF22-902 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.1. Unconformity-contact (Proterozoic unconformity); average age used 1850 Ma; 1.79 % U, 67.53 µg/g Tl, 622.08 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 3.48 ‰ | 1 | uranium ore (basement-hosted, deposit recorded as "downlake") Single analysis; per-sample uncertainty not published; full-procedure duplicate at +1.0; sample 11A-208-169.2 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 8.42 % U, 31.89 µg/g Tl, 1467.58 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −31 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample DF22-902, Dawn Lake; 234U deficit: uranium loss within the last 2.5 Myr; Voinot et al. (2024) report -33 ‰ on the same sample. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 5 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample 11A-208-169.2, Dawn Lake; Voinot et al. (2024) report +3.48 ‰ on the same sample. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… |
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.6 ± 0.7 ε | 1 | low-grade uranium ore (unconformity contact, deposit recorded as "defenial lake") Single analysis; ± 0.7 (2 SD); full-procedure duplicate at -2.4 ± 0.6; sample DF22-902 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.1. Unconformity-contact (Proterozoic unconformity); average age used 1850 Ma; 1.79 % U, 67.53 µg/g Tl, 622.08 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −4.6 ± 0.8 ε | 1 | uranium ore (basement-hosted, deposit recorded as "downlake") Single analysis; ± 0.8 (2 SD); full-procedure duplicate at -4.9 ± 0.6; sample 11A-208-169.2 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 8.42 % U, 31.89 µg/g Tl, 1467.58 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … |
δ97Mo in ‰ (per mil) Values of the same system
Standard : NIST SRM 3134
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −1 ± 0.1 ‰ | 1 | low-grade uranium ore (unconformity contact, deposit recorded as "defenial lake") Single analysis; ± 0.1 (2 SD); full-procedure duplicate at -0.9 ± 0.1; sample DF22-902 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.1. Unconformity-contact (Proterozoic unconformity); average age used 1850 Ma; 1.79 % U, 67.53 µg/g Tl, 622.08 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 3 ± 0.1 ‰ | 1 | uranium ore (basement-hosted, deposit recorded as "downlake") Single analysis; ± 0.1 (2 SD); full-procedure duplicate at +3.1 ± 0.1; sample 11A-208-169.2 (assigned to Dawn Lake (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 8.42 % U, 31.89 µg/g Tl, 1467.58 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … |
Deposits of the same type
- Athabasca basin (unconformity uranium province) Canada
- Shea Creek (Athabasca) Canada
- Tim Mersoï basin (Arlit, Akouta, Imouraren) Niger
- Inkai (Chu-Sarysu basin) Kazakhstan
- Tulukuevskoye Russia
- Ty Gallen France
- Rophin France
- Key Lake (Deilmann and Gaertner) Canada
Cite this page
IsoFind Atlas (2026). Dawn Lake (Athabasca), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/dawn-lake-athabasca/ (accessed 2026-10-16).
@misc{isofind2026dawnlakeathabascaisotopesigna,
title = {Dawn Lake (Athabasca), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/dawn-lake-athabasca/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16