Grafton Center (pegmatites, New Hampshire)
New Hampshire, Grafton County, United States
UraniumU (pegmatite)
- Type
- Uraninite-bearing granitic pegmatite (intrusion-related)
Uranium ore sample from the Queen's University collection analysed by Uvarova et al. (2014) for δ238U and δ234U. Pegmatite uraninite (Korzeb et al., 1997), in the group of magmatic deposits with δ238U close to bulk Earth. Indicative coordinates (Grafton).
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.11 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample M19255, Grafton Centre, New Hampshire; bracketing-only δ238U at -0.04; 238U/235U of 137.852; about -0.49 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… |
δ234U in ‰ (per mil) Values of the same system
Standard : équilibre séculaire
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample M19255, Grafton Centre, New Hampshire. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… |
Deposits of the same type
- Bancroft (uraniferous pegmatites) Canada
- Faraday Canada
- Madawaska Canada
- Denison Canada
- Milliken Lake Canada
- Stanleigh Canada
- Stanrock Canada
- Ingersoll Mine (Black Hills) United States
Cite this page
IsoFind Atlas (2026). Grafton Center (pegmatites, New Hampshire), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/grafton-center-pegmatites-new-hampshire/ (accessed 2026-10-16).
@misc{isofind2026graftoncenterpegmatitesnewham,
title = {Grafton Center (pegmatites, New Hampshire), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/grafton-center-pegmatites-new-hampshire/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16