Grota Funda

Pará, Carajás Northern Copper Belt (Amazonian Craton), Brazil

IOCGCu-Au

Type: IOCG (Cu-Au) in basalts and iron formation

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. Basalts and banded iron formation of the Itacaiúnas Supergroup, near the Carajás Shear Zone; copper-gold dated at 2530 ± 60 Ma (Re-Os on molybdenite), tourmaline syn- to post-main stage. Melo et al. (2021): tourmaline from +8.2 to +13.6 ‰.

δ11B in ‰ (per mil) Values of the same system

Standard : NIST SRM 951

Value	Range	n	Mineral or matrix	Source
10.5 ± 1.2 ‰	8.2 / 13.6 ‰	15	tourmaline coeval with late chloritization, sample 1093 Mean and standard deviation recalculated from 15 analyses, +8.2 to +13.6 (1093-1 g1 +13.6; 1093-2 g1 +10.3; 1093-3 g1 +10.8; 1093-4 g1 +10.0; 1093-5 g1 +11.2; 1093-6 g1 +9.6; 1093-7 g2 +10.3; 1093-8 g2 +10.3; 1093-9 g2 +9.7; 1093-10 g2 +10.3; 1093-11 g2 +11.1; 1093-12 g2 +10.8; 1093-13 g2 +11.2; 1093-14 g2 +8.2; 1093-15 g2 +9.4). 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). Grota Funda, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/grota-funda/ (accessed 2026-10-20).

@misc{isofind2026grotafundaisotopesignatures,
  title = {Grota Funda, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/grota-funda/},
  note = {Accessed 2026-10-20}
}

Updated : 2026-10-20