North Carolina Miocene phosphates
North Carolina, United States
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 Miocene (10 to 15 Ma) marine phosphate ore, Sr-rich (2534 mg/kg). 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 |
|---|---|---|---|---|
| 0.708489 | 1 | phosphate rock (bulk) Single analysis; sample US-11. | 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 |
|---|---|---|---|---|
| −0.133 ± 0.028 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample US-11; 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 |
|---|---|---|---|---|
| 22.9 ± 8.58 ‰ | 1 | extracted carbonate fluorapatite (CFA) Single analysis; sample US-11; 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 |
|---|---|---|---|---|
| 22.14 ‰ | 1 | rock phosphate (PO4 oxygen) Single analysis; sample US-11. | Hill et al. (2024), Reconstructing the depositional environment and diagenetic modificati… |
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- Kupferschiefer, Lubin-Sieroszowice district Poland
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Cite this page
IsoFind Atlas (2026). North Carolina Miocene phosphates, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/phosphates-miocenes-de-caroline-du-nord/ (accessed 2026-10-15).
@misc{isofind2026northcarolinamiocenephosphate,
title = {North Carolina Miocene phosphates, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/phosphates-miocenes-de-caroline-du-nord/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15