Yancey County pegmatites (Spruce Pine district)
North Carolina, Yancey County, United States
Magmatic (Ni-Cu-PGE, carbonatites)mica, feldspath (U)
- Type
- Granitic pegmatite with uraninite
Lower Palaeozoic pegmatites cutting Precambrian mica and amphibole gneisses and schists (Brost, 1962, cited by Balboni et al., 2016); sample Yancey1 from an unidentified mine, Th- and REE-rich uraninite. Uraninite 87Sr/86Sr measured by Balboni et al. (2016) for nuclear forensics: low ratios (below 0.7200) in low-temperature sandstone deposits, high in pegmatites, veins and breccia pipes. Indicative coordinates (Burnsville, county seat).
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.72144 ± 0.000007 | 1 | pegmatite uraninite (sample Yancey1) Single analysis; value read from the Figure 7 label, 2σ uncertainty. | Balboni et al. (2016), Chemical and Sr isotopic characterization of North America uranium… |
Deposits of the same type
- Carolina tin-spodumene belt United States
- Magnet Cove alkaline complex United States
- Sudbury Canada
- Hart deposit (Abitibi) Canada
- Alexo Canada
- Ruggles Mine United States
- Greenwood (pegmatites) United States
- Havey (pegmatite) United States
Cite this page
IsoFind Atlas (2026). Yancey County pegmatites (Spruce Pine district), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/pegmatites-du-comte-de-yancey-district-de-spruce-pine/ (accessed 2026-10-15).
@misc{isofind2026yanceycountypegmatitessprucep,
title = {Yancey County pegmatites (Spruce Pine district), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/pegmatites-du-comte-de-yancey-district-de-spruce-pine/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15