Dybryn
Buryatia, Vitim uranium district, Khiagda ore field (Amalat Plateau, Atalanga Basin), Russia
UraniumU
- Type
- Paleovalley sandstone-hosted uranium (infiltration type)
Exogenous epigenetic deposit in a basalt-capped paleovalley terrigenous sequence, formed in the late Paleogene and Neogene; pitchblende and coffinite ore. U-Pb ages of 26.9 to 6.5 Ma, widely scattered in U-poor rocks (oxidation and U loss) and 6.5 to 12.0 Ma in the ore; 238U/235U from 137.738 to 137.881, decreasing with U-Pb age in the ore; 234U/238U out of equilibrium in most samples: uranium remobilisation within the last 1.5 Myr (Golubev et al., 2013). Coordinates not published.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.881 ± 0.172 | 18.707 / 19.05 | 3 | U-poor terrigenous rocks (whole rock, 28 to 70 µg/g U) Mean and standard deviation recalculated from 3 analyses (5214/105.4, 5214/113.4, 5214/119.8), +18.707 to +19.05; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 24.465 ± 2.033 | 22.375 / 27.085 | 4 | uranium ore (whole rock, 0.095 to 0.175 % U) Mean and standard deviation recalculated from 4 analyses (5214/110.6, 5214/114.5, 5214/120.6, 5200/203.5), +22.375 to +27.085; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 26.78 ± 1.262 | 25.323 / 27.542 | 3 | fine fraction (below 1 µm) of the uranium ore Mean and standard deviation recalculated from 3 analyses (5214/114.5ff, 5214/120.6ff, 5200/203.5ff), +25.323 to +27.542; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.581 ± 0.001 | 15.58 / 15.582 | 3 | U-poor terrigenous rocks (whole rock, 28 to 70 µg/g U) Mean and standard deviation recalculated from 3 analyses (5214/105.4, 5214/113.4, 5214/119.8), +15.58 to +15.582; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 15.844 ± 0.067 | 15.781 / 15.927 | 4 | uranium ore (whole rock, 0.095 to 0.175 % U) Mean and standard deviation recalculated from 4 analyses (5214/110.6, 5214/114.5, 5214/120.6, 5200/203.5), +15.781 to +15.927; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 16.007 ± 0.059 | 15.965 / 16.075 | 3 | fine fraction (below 1 µm) of the uranium ore Mean and standard deviation recalculated from 3 analyses (5214/114.5ff, 5214/120.6ff, 5200/203.5ff), +15.965 to +16.075; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.664 ± 0.112 | 38.566 / 38.787 | 3 | U-poor terrigenous rocks (whole rock, 28 to 70 µg/g U) Mean and standard deviation recalculated from 3 analyses (5214/105.4, 5214/113.4, 5214/119.8), +38.566 to +38.787; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 38.463 ± 0.107 | 38.338 / 38.586 | 4 | uranium ore (whole rock, 0.095 to 0.175 % U) Mean and standard deviation recalculated from 4 analyses (5214/110.6, 5214/114.5, 5214/120.6, 5200/203.5), +38.338 to +38.586; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 38.456 ± 0.115 | 38.347 / 38.576 | 3 | fine fraction (below 1 µm) of the uranium ore Mean and standard deviation recalculated from 3 analyses (5214/114.5ff, 5214/120.6ff, 5200/203.5ff), +38.347 to +38.576; measured ratios, dominant common lead (at least 67 % of 206Pb in the ore, 99 % in the poor rocks); common lead composition used by the authors: 204Pb 1.359, 206Pb 25.162, 207Pb 21.156, 208Pb 52.323 (atomic %). | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
234U/238U isotope ratio, no unit Values of the same system
Standard : équilibre séculaire (5,49-5,52 × 10⁻⁵)
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.000061 ± 0.000012 | 0.000054 / 0.000075 | 3 | U-poor terrigenous rocks (whole rock, 28 to 70 µg/g U) Mean and standard deviation recalculated from 3 analyses (5214/105.4, 5214/113.4, 5214/119.8): 5.43; 5.48; 7.45 × 10⁻⁵, i.e. activity ratios of about 0.988; 0.997; 1.355 (equilibrium at 5.497 × 10⁻⁵); a departure from equilibrium signals uranium migration within the last 1.5 Myr. | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 0.000054 ± 0.000005 | 0.000048 / 0.000058 | 4 | uranium ore (whole rock, 0.095 to 0.175 % U) Mean and standard deviation recalculated from 4 analyses (5214/110.6, 5214/114.5, 5214/120.6, 5200/203.5): 5.44; 5.79; 4.79; 5.7 × 10⁻⁵, i.e. activity ratios of about 0.99; 1.053; 0.871; 1.037 (equilibrium at 5.497 × 10⁻⁵); a departure from equilibrium signals uranium migration within the last 1.5 Myr. | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 0.000049 ± 0 | 0.000048 / 0.000049 | 3 | fine fraction (below 1 µm) of the uranium ore Mean and standard deviation recalculated from 3 analyses (5214/114.5ff, 5214/120.6ff, 5200/203.5ff): 4.87; 4.86; 4.83 × 10⁻⁵, i.e. activity ratios of about 0.886; 0.884; 0.879 (equilibrium at 5.497 × 10⁻⁵); a departure from equilibrium signals uranium migration within the last 1.5 Myr. | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
238U/235U isotope ratio, no unit Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 137.775 ± 0.012 | 1 | U-poor terrigenous rocks (whole rock, 28 to 70 µg/g U) Single analysis (5214/119.8); ± 0.012; only poor rock analysed for this ratio. | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… | |
| 137.799 ± 0.047 | 137.738 / 137.85 | 4 | uranium ore (whole rock, 0.095 to 0.175 % U) Mean and standard deviation recalculated from 4 analyses (5214/110.6, 5214/114.5, 5214/120.6, 5200/203.5), +137.738 to +137.85, ± 0.010 to 0.011 each; in the ore the ratio decreases with apparent U-Pb age: heavy 238U, enriched in reduced U(IV), is lost during recent oxidation and redeposition. | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
| 137.816 ± 0.071 | 137.74 / 137.881 | 3 | fine fraction (below 1 µm) of the uranium ore Mean and standard deviation recalculated from 3 analyses (5214/114.5ff, 5214/120.6ff, 5200/203.5ff), +137.74 to +137.881, ± 0.010 to 0.011 each; in the ore the ratio decreases with apparent U-Pb age: heavy 238U, enriched in reduced U(IV), is lost during recent oxidation and redeposition. | Golubev et al. (2013), U-Pb systems and U isotopic composition of the sandstone-hosted pa… |
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). Dybryn, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/dybryn/ (accessed 2026-10-16).
@misc{isofind2026dybrynisotopesignatures,
title = {Dybryn, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/dybryn/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16