GT-46
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. Schists, amphibolites and granitoids along the Cinzento Shear Zone; copper-gold dated at 2503 ± 51 Ma, coeval with granites and pegmatites (2557 ± 26 Ma) around which tourmaline is abundant; older mineralization without tourmaline (2718 ± 56 Ma). Melo et al. (2021): tourmaline from +5.1 to +6.4 ‰, magmatic fluid signature.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 5.8 ± 0.6 ‰ | 5.1 / 6.4 ‰ | 6 | tourmaline of Fe-K halos near granites and pegmatites, sample FD39-232 Mean and standard deviation recalculated from 6 analyses, +5.1 to +6.4 (FD39-232-1 g1 +6.4; FD39-232-2 g1 +6.2; FD39-232-3 g1 +5.1; FD39-232-4 g1 +5.7; FD39-232-5 g2 +5.1; FD39-232-6 g2 +6.1). Grain number noted g. | Melo et al. (2021), Magmatic-hydrothermal fluids leaching older seafloor exhalative rocks… |
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Cite this page
IsoFind Atlas (2026). GT-46, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/gt-46/ (accessed 2026-10-20).
@misc{isofind2026gt46isotopesignatures,
title = {GT-46, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/gt-46/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20