Sigma
Val-d'Or, Quebec (Abitibi greenstone belt), Canada
Orogenic goldAu (W)
- Type
- Gold-scheelite quartz veins in a greenstone belt
Gold-scheelite quartz veins of the Abitibi belt (mineralisation about 2.69 to 2.58 Ga). Very unradiogenic lead of mantle or juvenile origin. Indicative coordinates.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 13.309 ± 0.011 | 13.301 / 13.316 | 2 | scheelite Mean and standard deviation recalculated from 2 samples, Table 2. Measured ratios, not age-corrected: the author regards them as close to initial common lead. Two analyses of the same sample. | Chiaradia (2003), The evolution of tungsten sources in crustal mineralization from Archea… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 14.46 ± 0.012 | 14.452 / 14.469 | 2 | scheelite Mean and standard deviation recalculated from 2 samples, Table 2. Measured ratios, not age-corrected: the author regards them as close to initial common lead. Two analyses of the same sample. | Chiaradia (2003), The evolution of tungsten sources in crustal mineralization from Archea… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 33.127 ± 0.03 | 33.106 / 33.149 | 2 | scheelite Mean and standard deviation recalculated from 2 samples, Table 2. Measured ratios, not age-corrected: the author regards them as close to initial common lead. Two analyses of the same sample. | Chiaradia (2003), The evolution of tungsten sources in crustal mineralization from Archea… |
Deposits of the same type
- Siscoe Canada
- Pascalis Canada
- Kirkland Lake (Macassa mine) Canada
- Coniaurum Canada
- McIntyre Canada
- Hollinger Canada
- Porcupine (Timmins district) Canada
- Moose River Canada
Cite this page
IsoFind Atlas (2026). Sigma, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/sigma/ (accessed 2026-10-13).
@misc{isofind2026sigmaisotopesignatures,
title = {Sigma, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/sigma/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13