Khouribga and Youssoufia
Phosphates Plateau and Gantour Basin, Morocco
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. Maastrichtian to Ypresian (about 60 Ma); MA-1 is the BCR-032 reference material (natural Moroccan phosphorite), MA-4 the only sample assigned to Khouribga in Table S2. Indicative coordinates (Khouribga).
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.70786 ± 0.00015 | 0.707555 / 0.707938 | 6 | phosphate rock (bulk) Mean and standard deviation recalculated from 6 analyses, samples MA-1, MA-2, MA-3, MA-4, MA-5, MA-6. | 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 |
|---|---|---|---|---|
| −0.15 ± 0.015 ‰ | −0.162 / −0.133 ‰ | 3 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 3 analyses, samples MA-1, MA-2, MA-4; 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 |
|---|---|---|---|---|
| −1.88 ± 2.29 ‰ | −4.37 / 0.13 ‰ | 3 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 3 analyses, samples MA-1, MA-2, MA-4; 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 |
|---|---|---|---|---|
| 19.72 ± 0.7 ‰ | 19.19 / 20.51 ‰ | 3 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 3 analyses, samples MA-4, MA-5, MA-6. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
Deposits of the same type
- Benasque Pass mines (Mina Peak) Spain
- Gafsa phosphate basin Tunisie
- Largentière France
- Ballyrisode Irlande
- Mount Gabriel Irlande
- Derrycarhoon Irlande
- Cappaghglass Irlande
- Derrynane Irlande
Cite this page
IsoFind Atlas (2026). Khouribga and Youssoufia, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/khouribga-et-youssoufia/ (accessed 2026-10-15).
@misc{isofind2026khouribgaandyoussoufiaisotope,
title = {Khouribga and Youssoufia, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/khouribga-et-youssoufia/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15