Sichuan Devonian phosphates (Shijiao, Hanyuan)
Sichuan, 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. Middle to Late Devonian (about 376 Ma); large 234U excess at Hanyuan (δ234U of +116 ‰), uranium remobilised over the last two million years. 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 |
|---|---|---|---|---|
| 0.709644 ± 0.002258 | 0.708047 / 0.711241 | 2 | phosphate rock (bulk) Mean and standard deviation recalculated from 2 analyses, samples CN-1, CN-2. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
| 0.711086 | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample CN-2. | 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 |
|---|---|---|---|---|
| −0.25 ± 0.021 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample CN-2; 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 |
|---|---|---|---|---|
| 115.87 ± 8.33 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample CN-2; 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 |
|---|---|---|---|---|
| 15.13 ± 3.18 ‰ | 12.88 / 17.38 ‰ | 2 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 2 analyses, samples CN-1, CN-2. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
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Cite this page
IsoFind Atlas (2026). Sichuan Devonian phosphates (Shijiao, Hanyuan), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/phosphates-devoniens-du-sichuan-shijiao-hanyuan/ (accessed 2026-10-15).
@misc{isofind2026sichuandevonianphosphatesshij,
title = {Sichuan Devonian phosphates (Shijiao, Hanyuan), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/phosphates-devoniens-du-sichuan-shijiao-hanyuan/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15