Guarda uranium province (site 1)
Beira Interior, Guarda district, Portugal
UraniumU
- Type
- Uranium veins in Hercynian granites
Vein-type uranium ore analysed by Keatley et al. (2021) for δ238U and δ234U (nuclear forensics). Spoil heaps of a disused mine (site 1) in Hercynian granites (about 290 Ma): oxidised torbernite, saleeite and bassetite; δ238U of -0.63 to +0.15 ‰, including the lowest value of the study. Indicative coordinates (Guarda), mine not named.
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.632 ± 0.04 ‰ | 1 | torbernite Single analysis; ± 0.04 ‰ (2 SD); sample S107, site 1 of the Guarda province; oxidised (U(VI)) phase according to the authors; lowest value of the study. | Keatley et al. (2021), Uranium isotope variation within vein-type uranium ore deposits, A… | |
| −0.07 ± 0.04 ‰ | 1 | saleeite and bassetite Single analysis; ± 0.04 ‰ (2 SD); sample S109, site 1 of the Guarda province; oxidised (U(VI)) phase according to the authors. | Keatley et al. (2021), Uranium isotope variation within vein-type uranium ore deposits, A… | |
| 0.152 ± 0.04 ‰ | 1 | torbernite Single analysis; ± 0.04 ‰ (2 SD); sample S108, site 1 of the Guarda province; oxidised (U(VI)) phase according to the authors. | Keatley et al. (2021), Uranium isotope variation within vein-type uranium ore deposits, A… |
δ234U in ‰ (per mil) Values of the same system
Standard : équilibre séculaire
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −9 ± 0.4 ‰ | 1 | torbernite Single analysis; ± 0.4 ‰ (2 SD); sample S107, site 1 of the Guarda province; oxidised (U(VI)) phase according to the authors. | Keatley et al. (2021), Uranium isotope variation within vein-type uranium ore deposits, A… | |
| 7.5 ± 0.4 ‰ | 1 | saleeite and bassetite Single analysis; ± 0.4 ‰ (2 SD); sample S109, site 1 of the Guarda province; oxidised (U(VI)) phase according to the authors. | Keatley et al. (2021), Uranium isotope variation within vein-type uranium ore deposits, A… | |
| −0.3 ± 0.4 ‰ | 1 | torbernite Single analysis; ± 0.4 ‰ (2 SD); sample S108, site 1 of the Guarda province; oxidised (U(VI)) phase according to the authors. | Keatley et al. (2021), Uranium isotope variation within vein-type uranium ore deposits, A… |
Deposits of the same type
- Urgeiriça uranium province (sites 7 and 8) Portugal
- Ty Gallen France
- Littleham Cove (Devon) United Kingdom
- Rophin France
- Schlema-Alberoda Germany
- Jáchymov Czechia
- Příbram (uranium district) Czechia
- Stráž pod Ralskem Czechia
Cite this page
IsoFind Atlas (2026). Guarda uranium province (site 1), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/province-uranifere-de-guarda-site-1/ (accessed 2026-10-16).
@misc{isofind2026guardauraniumprovincesite1iso,
title = {Guarda uranium province (site 1), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/province-uranifere-de-guarda-site-1/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16