Hahotoé-Kpogamé
Maritime Region, Togo
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. Upper Ypresian to Lower Lutetian (about 48 Ma); 87Sr/86Sr below the seawater curve, ascribed to diagenetic modification. Coordinates not given.
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.707208 ± 0.00009 | 0.707105 / 0.707263 | 3 | phosphate rock (bulk) Mean and standard deviation recalculated from 3 analyses, samples TG-1, TG-2, TG-3. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
| 0.706926 ± 0.00003 | 0.706905 / 0.706947 | 2 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 2 analyses, samples TG-1, TG-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 |
|---|---|---|---|---|
| −0.104 ± 0.033 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample TG-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 |
|---|---|---|---|---|
| 15.81 ± 6.41 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample TG-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 |
|---|---|---|---|---|
| 20.13 ± 0.29 ‰ | 19.8 / 20.35 ‰ | 3 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 3 analyses, samples TG-1, TG-2, TG-3. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
Deposits of the same type
- Central African Copperbelt (whole province) DR Congo and Zambia
- Witwatersrand basin South Africa
- Stelvio Italy
- Oris Italy
- Kupferschiefer, Lubin-Sieroszowice district Poland
- Timna Israël
- Datangpo-type manganese (Gaolou, Minle, Zhenxing) China
- Eyller Bruch bog iron ore Germany
Cite this page
IsoFind Atlas (2026). Hahotoé-Kpogamé, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/hahotoe-kpogame/ (accessed 2026-10-15).
@misc{isofind2026hahotoekpogameisotopesignatur,
title = {Hahotoé-Kpogamé, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/hahotoe-kpogame/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15