Gafsa phosphate basin
Gafsa Governorate, Tunisie
OtherP
- Type
- Marine sedimentary phosphorite (carbonate fluorapatite)
Phosphate rocks studied by Hill et al. (2024) to reconstruct redox conditions and diagenesis: U, Sr and rare earths carried by carbonate fluorapatite; samples taken at mines or from the Julius Kühn Institute archives. Thanetian (about 58 Ma). Indicative coordinates (Metlaoui).
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.707848 ± 0.00001 | 0.707836 / 0.707854 | 3 | phosphate rock (bulk) Mean and standard deviation recalculated from 3 analyses, samples TN-1, TN-2, TN-3. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.239 ± 0.023 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample TN-1; modern seawater at -0.38 ‰ for comparison. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
δ234U in ‰ (per mil) Values of the same system
Standard : équilibre séculaire
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.96 ± 10.97 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample TN-1; a departure from 0 signals uranium mobility within the last two million years. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 20.95 ± 0.09 ‰ | 20.85 / 21.01 ‰ | 3 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 3 analyses, samples TN-1, TN-2, TN-3. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
Deposits of the same type
- Largentière France
- Benasque Pass mines (Mina Peak) Spain
- Lengenbach (Binn Valley) Switzerland
- Stelvio Italy
- Oris Italy
- Khouribga and Youssoufia Morocco
- Lahn-Dill ores (Grube Fortuna, Wetzlar) Germany
- Klingenthal-Kraslice Germany
Cite this page
IsoFind Atlas (2026). Gafsa phosphate basin, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/bassin-phosphate-de-gafsa/ (accessed 2026-10-15).
@misc{isofind2026gafsaphosphatebasinisotopesig,
title = {Gafsa phosphate basin, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/bassin-phosphate-de-gafsa/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15