Yunnan Cambrian phosphates (Jinning, Kunming)
Yunnan, 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. Early Cambrian (about 535 Ma); moderate to high quartz; low δ238U from an anoxic seafloor or diagenesis. 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 |
|---|---|---|---|---|
| 0.71072 ± 0.001215 | 0.709342 / 0.711636 | 3 | phosphate rock (bulk) Mean and standard deviation recalculated from 3 analyses, samples CN-3, CN-4, CN-5. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
| 0.709981 ± 0.000742 | 0.709127 / 0.710471 | 3 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 3 analyses, samples CN-3, CN-4, CN-5. | 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 |
|---|---|---|---|---|
| −0.472 ± 0.031 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample CN-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 |
|---|---|---|---|---|
| −21.53 ± 9.45 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample CN-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 |
|---|---|---|---|---|
| 12.96 ± 0.82 ‰ | 12.18 / 13.81 ‰ | 3 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 3 analyses, samples CN-3, CN-4, CN-5. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
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Cite this page
IsoFind Atlas (2026). Yunnan Cambrian phosphates (Jinning, Kunming), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/phosphates-cambriens-du-yunnan-jinning-kunming/ (accessed 2026-10-15).
@misc{isofind2026yunnancambrianphosphatesjinni,
title = {Yunnan Cambrian phosphates (Jinning, Kunming), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/phosphates-cambriens-du-yunnan-jinning-kunming/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15