Eagle Point (Athabasca)
Saskatchewan, eastern margin of the Athabasca Basin (Rabbit Lake area), Canada
UraniumU
- Type
- Basement-hosted Proterozoic unconformity uranium
Uranium ore sample from the Queen's University collection analysed by Uvarova et al. (2014) for δ238U and δ234U. Basement-hosted deposit with its extension (Eagle Point Extension) (Cloutier et al., 2011): primary and remobilised uraninite, secondary becquerelite; δ238U of +0.37 to +0.90 ‰ and δ234U of -217 to +281 ‰, the most scattered of the unconformity deposits (recent remobilisation). Voinot et al. (2024) analysed EPE80-319.5 and EPE59-137.4. Coordinates not published.
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.21 ‰ | 1 | remobilised uranium ore (basement-hosted) Single analysis; per-sample uncertainty not published; sample EPE80-319.5 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 37.35 % U, 1.98 µg/g Tl, 55.99 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 0.3 ‰ | 1 | uranium ore (basement-hosted) Single analysis; per-sample uncertainty not published; sample EPE59-137.4 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 66.37 % U, 1062.73 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 0.57 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE63-076.6, Eagle Point Extension; bracketing-only δ238U at +0.57; 238U/235U of 137.915; about -0.03 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.85 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE80-319.5, Eagle Point Extension; bracketing-only δ238U at +1.05; 238U/235U of 137.953; about +0.25 ‰ 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… | |
| 0.56 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE44-236, Eagle Point Extension; bracketing-only δ238U at +0.43; 238U/235U of 137.914; about -0.04 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.6 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE44-251, Eagle Point Extension; bracketing-only δ238U at +0.51; 238U/235U of 137.919; about 0.00 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.63 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE44-317, Eagle Point Extension; bracketing-only δ238U at +0.75; 238U/235U of 137.923; about +0.03 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.9 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE59-137.4, Eagle Point Extension; bracketing-only δ238U at +0.78; 238U/235U of 137.96; about +0.30 ‰ after removing the 0.60 ‰ offset specific to this study; same sample as Voinot et al. (2024), published at +0.30 ‰. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.54 ± 0.1 ‰ | 1 | becquerelite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EPE 72-280.6, Eagle Point; bracketing-only δ238U at +0.50; 238U/235U of 137.911; about -0.06 ‰ after removing the 0.60 ‰ offset specific to this study; secondary U(VI) mineral. | 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 H-779-57, Eagle Point; bracketing-only δ238U at +0.42; 238U/235U of 137.887; about -0.23 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.78 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EP-2, Eagle Point; bracketing-only δ238U at +0.71; 238U/235U of 137.945; about +0.18 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.5 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EP222-215.5, Eagle Point; bracketing-only δ238U at +0.51; 238U/235U of 137.905; about -0.10 ‰ after removing the 0.60 ‰ offset specific to this study. | 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 |
|---|---|---|---|---|
| 158.91 ‰ | 1 | remobilised uranium ore (basement-hosted) Single analysis; per-sample uncertainty not published; sample EPE80-319.5 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 37.35 % U, 1.98 µg/g Tl, 55.99 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 279 ‰ | 1 | uranium ore (basement-hosted) Single analysis; per-sample uncertainty not published; sample EPE59-137.4 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 66.37 % U, 1062.73 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 2 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EPE63-076.6, Eagle Point Extension. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| −217 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EPE80-319.5, Eagle Point Extension; 234U deficit: uranium loss within the last 2.5 Myr; Voinot et al. (2024) report +158.91 ‰ on the same sample. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| −19 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EPE44-236, Eagle Point Extension. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 41 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EPE44-251, Eagle Point Extension; 234U excess: uranium gain within the last 2.5 Myr. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 19 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EPE44-317, Eagle Point Extension. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 281 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EPE59-137.4, Eagle Point Extension; 234U excess: uranium gain within the last 2.5 Myr; Voinot et al. (2024) report +279 ‰ on the same sample. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| −1 ‰ | 1 | becquerelite Single analysis; per-sample uncertainty not published; sample EPE 72-280.6, Eagle Point; secondary U(VI) mineral. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample H-779-57, Eagle Point. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 1 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EP-2, Eagle Point. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 3 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EP222-215.5, Eagle Point. | 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 |
|---|---|---|---|---|
| 5 ± 0.6 ε | 1 | remobilised uranium ore (basement-hosted) Single analysis; ± 0.6 (2 SD); sample EPE80-319.5 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 37.35 % U, 1.98 µg/g Tl, 55.99 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 |
|---|---|---|---|---|
| −6.7 ± 0.2 ‰ | 1 | remobilised uranium ore (basement-hosted) Single analysis; ± 0.2 (2 SD); sample EPE80-319.5 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 37.35 % U, 1.98 µg/g Tl, 55.99 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −2.2 ± 0.2 ‰ | 1 | uranium ore (basement-hosted) Single analysis; ± 0.2 (2 SD); sample EPE59-137.4 (assigned to Eagle Point (Athabasca) after Uvarova et al., 2014); IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 66.37 % U, 1062.73 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). Eagle Point (Athabasca), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/eagle-point-athabasca/ (accessed 2026-10-16).
@misc{isofind2026eaglepointathabascaisotopesig,
title = {Eagle Point (Athabasca), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/eagle-point-athabasca/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16