Chepok
North Baikal region, Nechera-Nichatka (Chara) uranium district, Bul'bukhta area, Russia
UraniumU (Mo)
- Type
- Brannerite-pitchblende uranium in Palaeoproterozoic granitoids, below an unconformity
Recently discovered deposit in strongly deformed Palaeoproterozoic granitoids of the Chuya-Nechera complex, near the contact with the unconformable Riphean cover; brannerite-pitchblende ore in chlorite-hydromica alteration haloes, economic molybdenum in the northern area. Primary uraninite at 1832 ± 13 Ma, transformed at 377 ± 5 Ma; radiogenic lead redeposited as galena in late veinlets. U-Pb and Pb-Pb ages by micro-sampling, isotope dilution and TIMS (Golubev et al., 2008). Coordinates not given.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 96.396 ± 3.62039 | 93.836 / 98.956 | 2 | late-veinlet galena (cores of the largest grains) Mean and standard deviation recalculated from 2 analyses, highly radiogenic lead extracted from Palaeoproterozoic uraninite and redeposited during ore transformation at about 377 Ma (samples Ga-5415-1 and Ga-5415-2). | Golubev et al. (2008), Deposition and remobilization of uranium in the North Baikal regio… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 25.501 ± 0.50487 | 25.144 / 25.858 | 2 | late-veinlet galena (cores of the largest grains) Mean and standard deviation recalculated from 2 analyses, highly radiogenic lead extracted from Palaeoproterozoic uraninite and redeposited during ore transformation at about 377 Ma (samples Ga-5415-1 and Ga-5415-2). | Golubev et al. (2008), Deposition and remobilization of uranium in the North Baikal regio… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 40.695 ± 0.12162 | 40.609 / 40.781 | 2 | late-veinlet galena (cores of the largest grains) Mean and standard deviation recalculated from 2 analyses, highly radiogenic lead extracted from Palaeoproterozoic uraninite and redeposited during ore transformation at about 377 Ma (samples Ga-5415-1 and Ga-5415-2). | Golubev et al. (2008), Deposition and remobilization of uranium in the North Baikal regio… |
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). Chepok, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/chepok/ (accessed 2026-10-15).
@misc{isofind2026chepokisotopesignatures,
title = {Chepok, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/chepok/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15