Alvo 118
Carajás Mineral Province, Pará, Brazil
IOCGCu-Au
- Type
- Iron oxide-copper-gold (IOCG) breccias and stockworks
Carajás Mineral Province, Itacaiúnas Shear Belt, southern segment, near Canaã dos Carajás; same family as Sossego. 170 Mt at 1.0 % Cu and 0.3 g/t Au, along a 60 km WNW-ESE shear zone, at the contact between the Itacaiúnas Supergroup (about 2.76 Ga) and the Xingu basement. Sodic alteration, potassic alteration with magnetite, pervasive chlorite linked to quartz-carbonate-sulphide breccias; chalcopyrite, bornite, hematite, magnetite. The shallowest of the Carajás IOCG systems according to the authors. Indicative coordinates.
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −6.8 ± 1.1 ‰ | −8.1 / −5 ‰ | 10 | ore-breccia calcite Mean and standard deviation recalculated from 10 analyses, one breccia with chloritised gabbro fragments stands apart (δ13C -5.9 ‰, δ18O +16.5 ‰). | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
| −5.6 ± 1.3 ‰ | −7.3 / −4.3 ‰ | 5 | late chalcopyrite-quartz vein calcite Mean and standard deviation recalculated from 5 analyses, veins in sheared basalt. | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
| −5 ± 1.8 ‰ | −7.5 / −1.7 ‰ | 10 | barren vein and microbreccia calcite Mean and standard deviation recalculated from 10 analyses, indistinguishable from the ore calcite; negative δ13C-δ18O correlation apart from two outliers. | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 8 ± 3.4 ‰ | 4.9 / 16.5 ‰ | 10 | ore-breccia calcite Mean and standard deviation recalculated from 10 analyses, one breccia with chloritised gabbro fragments stands apart (δ13C -5.9 ‰, δ18O +16.5 ‰). | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
| 6.9 ± 0.7 ‰ | 6.2 / 7.9 ‰ | 5 | late chalcopyrite-quartz vein calcite Mean and standard deviation recalculated from 5 analyses, veins in sheared basalt. | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
| 6.4 ± 1.6 ‰ | 3.9 / 9 ‰ | 10 | barren vein and microbreccia calcite Mean and standard deviation recalculated from 10 analyses, indistinguishable from the ore calcite; negative δ13C-δ18O correlation apart from two outliers. | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 5.8 ± 0.4 ‰ | 5.1 / 6.3 ‰ | 8 | chalcopyrite (breccias and veins) mean and standard deviation given by the authors; no difference between breccia and veins. Heavier than magmatic sulphur: contribution of evaporative fluids, as at Sossego. | Torresi et al. (2012), Hydrothermal alteration, fluid inclusions and stable isotope syste… |
Deposits of the same type
- Castanha Brazil
- Bacaba Brazil
- El Laco Chile
- Candelaria-Punta del Cobre district Chile
- Grängesberg and Blötberget Sweden
- Kiirunavaara (Kiruna) Sweden
- Gruvberget (Svappavaara) Sweden
- Kevus (Lannavaara) Sweden
Cite this page
IsoFind Atlas (2026). Alvo 118, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/alvo-118/ (accessed 2026-10-13).
@misc{isofind2026alvo118isotopesignatures,
title = {Alvo 118, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/alvo-118/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13