Hubei Neoproterozoic phosphates (Yichang, Jingmen, Jingzhou)
Hubei, China
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. Neoproterozoic (about 770 Ma according to the authors); common dolomite or ankerite; 87Sr/86Sr more radiogenic than contemporaneous seawater at Yichang and Jingmen, close to 0.7083 at Sr-rich Jingzhou; δ238U among the lowest of the study. 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 |
|---|---|---|---|---|
| 0.714864 ± 0.006274 | 0.708312 / 0.723231 | 7 | phosphate rock (bulk) Mean and standard deviation recalculated from 7 analyses, samples CN-6, CN-7, CN-8, CN-9, CN-10, CN-11, CN-12. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
| 0.714396 ± 0.006248 | 0.70831 / 0.723301 | 7 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 7 analyses, samples CN-6, CN-7, CN-8, CN-9, CN-10, CN-11, CN-12. | 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 |
|---|---|---|---|---|
| −0.568 ± 0.021 ‰ | −0.583 / −0.553 ‰ | 2 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 2 analyses, samples CN-8, CN-10; 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 |
|---|---|---|---|---|
| 159.54 ± 61.8 ‰ | 115.84 / 203.24 ‰ | 2 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 2 analyses, samples CN-8, CN-10; 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 |
|---|---|---|---|---|
| 15.14 ± 2.2 ‰ | 12.34 / 18.18 ‰ | 7 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 7 analyses, samples CN-6, CN-7, CN-8, CN-9, CN-10, CN-11, CN-12. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
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Cite this page
IsoFind Atlas (2026). Hubei Neoproterozoic phosphates (Yichang, Jingmen, Jingzhou), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/phosphates-neoproterozoiques-du-hubei-yichang-jingmen-jingzhou/ (accessed 2026-10-15).
@misc{isofind2026hubeineoproterozoicphosphates,
title = {Hubei Neoproterozoic phosphates (Yichang, Jingmen, Jingzhou), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/phosphates-neoproterozoiques-du-hubei-yichang-jingmen-jingzhou/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15