Salobo
Pará, Carajás Northern Copper Belt (Amazonian Craton), Brazil
IOCGCu-Au
- Type
- IOCG (Cu-Au) in a shear zone
Neoarchean IOCG deposit of the Carajás Province (see also the Carajás entry); main mineralization around 2.55 Ga within Fe-K then chlorite alteration halos. Gneisses, granitoids and volcano-sedimentary units sheared along the Cinzento Shear Zone; massive copper-gold mineralization dated at 2576 ± 8 Ma (Re-Os on molybdenite), where Fe-K alteration and tourmaline intensify. Melo et al. (2021): tourmaline cores from +14.9 to +17.0 ‰, rims from +3.4 to +8.2 ‰.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 16.5 ± 0.6 ‰ | 14.9 / 17 ‰ | 11 | tourmaline cores of the Fe-K alteration, sample FD177 Mean and standard deviation recalculated from 11 analyses, +14.9 to +17.0 (FD177-1 g1 +17.0; FD177-2 g1 +16.6; FD177-3 g1 +16.7; FD177-8 g1 +16.7; FD177-9 g2 +16.8; FD177-10 g2 +14.9; FD177-11 g2 +16.6; FD177-14 g3 +16.3; FD177-15 g3 +16.3; FD177-16 g3 +16.5; FD177-17 g3 +16.8). Grain number noted g. Split between cores and rims inferred from the ranges of the text, which do not overlap: Supplementary Table 2 only distinguishes grains. | Melo et al. (2021), Magmatic-hydrothermal fluids leaching older seafloor exhalative rocks… |
| 5.6 ± 1.5 ‰ | 3.4 / 8.2 ‰ | 9 | tourmaline rims of the Fe-K alteration, sample FD177 Mean and standard deviation recalculated from 9 analyses, +3.4 to +8.2 (FD177-4 g1 +5.7; FD177-5 g1 +3.4; FD177-6 g1 +3.7; FD177-7 g1 +8.2; FD177-12 g2 +6.2; FD177-13 g2 +6.0; FD177-18 g3 +4.4; FD177-19 g3 +6.5; FD177-20 g3 +6.3). Grain number noted g. Split between cores and rims inferred from the ranges of the text, which do not overlap: Supplementary Table 2 only distinguishes grains. | Melo et al. (2021), Magmatic-hydrothermal fluids leaching older seafloor exhalative rocks… |
| 18.7 ± 3.3 ‰ | 14.5 / 24 ‰ | 14 | tourmaline associated with bornite-chalcocite-chalcopyrite ore Mean and standard deviation recalculated from 14 analyses, +14.5 to +24.0 (F41/486.40 1 c +15.8; F41/486.40 2 c +14.5; F41/486.40 3 c +15.0; F41/486.40 4 c +14.5; F41/486.40 5 c +15.5; F41/486.40 6 c +16.8; F54/357.60 1 c +20.6; F54/357.60 2 c +19.6; F54/357.60 3 c +19.9; F54/357.60 4 c +20.5; F54/357.60 5 c +21.9; F54/357.60 6 c +21.9; F54/357.60 7 c +21.9; F54/357.60 8 r +24.0). Samples F41/486.40 (14.5 to 16.8 ‰) and F54/357.60 (19.6 to 24.0 ‰); text: 14.5 to 24 ‰. Schorl-dravite partly enclosed in magnetite and sulphides. | Xavier et al. (2008), Tourmaline B-isotopes fingerprint marine evaporites as the source o… |
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Cite this page
IsoFind Atlas (2026). Salobo, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/salobo/ (accessed 2026-10-20).
@misc{isofind2026saloboisotopesignatures,
title = {Salobo, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/salobo/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20