Tim Mersoï basin (Arlit, Akouta, Imouraren)
Agadez (Tim Mersoï sedimentary basin, north), Niger
UraniumU
- Type
- Sandstone-hosted uranium (tabular, locally roll-front)
A major uranium province in Niger, the world's fourth largest historical producer with about 159,000 t of uranium produced since 1971. Mineralisation is tabular, in continental siliciclastic formations along the regional Arlit fault. At Arlit (Tarat, Carboniferous) and Akouta (Guezouman, Carboniferous) the host is reduced and uranium is mainly tetravalent; at Imouraren (Tchirezrine, Jurassic) the host is oxidised and hexavalent uranium dominates, as silicates and vanadates. Grades range from 0.1 to 0.6% U.
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.29 ‰ | uraninite and coffinite (sandstone-hosted type) Mean value for the sandstone-hosted category in the global compilation of Brennecka et al. (2010), where Tim Mersoï is among the type examples. It is higher than for the Athabasca unconformity deposits (+0.2 ‰) and the Olympic Dam IOCG (about 0 ‰). Active roll-fronts can locally give negative values through the Rayleigh effect (South Texas, Murphy et al., 2014). | Brennecka et al. 2010, Variations in the uranium isotopic compositions of uranium ores fr… |
Deposits of the same type
- Rophin France
- Ty Gallen France
- Inkai (Chu-Sarysu basin) Kazakhstan
- Tulukuevskoye Russia
- Athabasca basin (unconformity uranium province) Canada
- Shea Creek (Athabasca) Canada
Cite this page
IsoFind Atlas (2026). Tim Mersoï basin (Arlit, Akouta, Imouraren), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/bassin-de-tim-mersoi-arlit-akouta-imouraren/ (accessed 2026-10-06).
@misc{isofind2026timmersoibasinarlitakoutaimou,
title = {Tim Mersoï basin (Arlit, Akouta, Imouraren), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/bassin-de-tim-mersoi-arlit-akouta-imouraren/},
note = {Accessed 2026-10-06}
}Updated : 2026-10-06