Bacaba
Carajás Mineral Province, Pará, Brazil
IOCGCu-Au
- Type
- Iron oxide-copper-gold (IOCG)
Carajás Mineral Province, Itacaiúnas Shear Belt, southern segment, near Canaã dos Carajás; same family as Sossego. Hosted by the Bacaba Tonalite (about 3.00 Ga), the Serra Dourada Granite (2.85 Ga) and gabbros. Sodic, iron and potassic-iron alteration at about 2.70 Ga, overprinted at about 2.06 Ga (chlorite, albite, sericite, calcite-hematite). Chalcopyrite-magnetite-bornite ore, then chalcopyrite-pyrite-hematite ore. Mixing of a hot magmatic brine with a cold, dilute fluid; calcite fluids near 225 °C: δ13C -4.8 to -3.0 ‰. Indicative coordinates.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.3 / 5.4 ‰ | mineralised-zone sulphides (chalcopyrite) slightly heavier than magmatic sulphur: possible external input through thermochemical sulphate reduction according to the authors. | Pestilho et al. (2020), Stable isotopes and fluid inclusion constraints on the fluid evol… |
Deposits of the same type
- Castanha Brazil
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- Grängesberg and Blötberget Sweden
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- Gruvberget (Svappavaara) Sweden
- Kevus (Lannavaara) Sweden
Cite this page
IsoFind Atlas (2026). Bacaba, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/bacaba/ (accessed 2026-10-13).
@misc{isofind2026bacabaisotopesignatures,
title = {Bacaba, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/bacaba/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13