Florida Miocene phosphates
Florida, 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 ores; US-7 is the NIST SRM 120b reference material (Florida phosphate rock); low to moderate dolomite. 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 |
|---|---|---|---|---|
| 0.708705 ± 0.00026 | 0.708023 / 0.708919 | 10 | phosphate rock (bulk) Mean and standard deviation recalculated from 10 analyses, samples US-1, US-2, US-3, US-4, US-5, US-6, US-7, US-8, US-9, US-10. | 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 |
|---|---|---|---|---|
| −0.26 ± 0.045 ‰ | −0.311 / −0.231 ‰ | 3 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 3 analyses, samples US-1, US-3, US-8; 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 |
|---|---|---|---|---|
| 18.94 ± 24.29 ‰ | −8.06 / 39.03 ‰ | 3 | extracted carbonate fluorapatite (CFA) Mean and standard deviation recalculated from 3 analyses, samples US-1, US-3, US-8; 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 |
|---|---|---|---|---|
| 21.42 ± 0.12 ‰ | 21.25 / 21.58 ‰ | 7 | rock phosphate (PO4 oxygen) Mean and standard deviation recalculated from 7 analyses, samples US-2, US-3, US-4, US-5, US-6, US-9, US-10. | 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). Florida Miocene phosphates, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/phosphates-miocenes-de-floride/ (accessed 2026-10-15).
@misc{isofind2026floridamiocenephosphatesisoto,
title = {Florida Miocene phosphates, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/phosphates-miocenes-de-floride/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15