Red October
Western Australia, Laverton greenstone belt, Australia
Orogenic goldAu
- Type
- Orogenic gold (Archaean greenstone belt)
Laverton greenstone belt (north-eastern Eastern Goldfields Province, Yilgarn Craton), greenschist-facies metamorphism. Orogenic gold dated at about 2.65 Ga across the district (hydrothermal monazite and xenotime, SHRIMP U-Pb), unrelated in age to nearby granitoids: a single fluid from a deep, distal source according to the authors; regional fluid calculated at 300 °C at δ13C -3.9 ‰ and δ18O +5.8 ‰. Deposit mined by Sons of Gwalia, 80 km south of Laverton, resource of 12.25 t Au at 5.9 g/t. Mafic-ultramafic volcanic and sedimentary succession cut by the Red October shear zone (70 % of the gold, minor graphitic shale), D1 thrust duplex; quartz-carbonate breccia veins with pyrite, pyrrhotite and arsenopyrite. Ore carbonates with more negative δ13C, ascribed to reaction with reduced black shales. Coordinates not given.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.88 ± 1.17 ‰ | 0.7 / 3.9 ‰ | 8 | auriferous vein pyrite Mean and standard deviation recalculated from 8 analyses, samples BS13, BS14 and BS39 (quartz-carbonate-sericite-pyrite-arsenopyrite veins in basalt). | Salier et al. (2005), Geochronological and Stable Isotope Evidence for Widespread Orogeni… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −6 ± 2.12 ‰ | −8.8 / −3.5 ‰ | 7 | gold-related calcite Mean and standard deviation recalculated from 7 analyses, samples BS13, BS14, BS15, BS16 (with its repeat), BS40 and BS46; δ13C lowered by reaction with black shales according to the authors. | Salier et al. (2005), Geochronological and Stable Isotope Evidence for Widespread Orogeni… |
| −4.1 ‰ | 1 | gold-related dolomite (BS39) Single analysis. | Salier et al. (2005), Geochronological and Stable Isotope Evidence for Widespread Orogeni… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 10.46 ± 1.2 ‰ | 8.2 / 12 ‰ | 7 | gold-related calcite Mean and standard deviation recalculated from 7 analyses, same set, BS16 repeat included. | Salier et al. (2005), Geochronological and Stable Isotope Evidence for Widespread Orogeni… |
| 11.2 ‰ | 1 | gold-related dolomite (BS39) Single analysis. | Salier et al. (2005), Geochronological and Stable Isotope Evidence for Widespread Orogeni… |
Deposits of the same type
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- Loulo (district de Gara-Yalea) Mali
- Gounkoto Mali
- Massawa Senegal
- Kirkland Lake (Macassa mine) Canada
Cite this page
IsoFind Atlas (2026). Red October, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/red-october/ (accessed 2026-10-14).
@misc{isofind2026redoctoberisotopesignatures,
title = {Red October, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/red-october/},
note = {Accessed 2026-10-14}
}Updated : 2026-10-14