Gongo Soco
Minas Gerais, Quadrilátero Ferrífero, Brazil
Banded iron formationsFe (talc, Au-Pd)
- Type
- Soft hematite on itabirite, with talc mineralization
High-grade soft hematite deposit (about 67 % Fe, up to 1 % Mn), orebody 1300 m long in Cauê Formation itabirite, bounded by E-W shear zones; former 19th-century underground palladian gold mine. Hematite-talc schist between soft hematite and dolomitic itabirite, formed by alteration of dolomitic itabirite by oxidizing F-rich brines. Cabral et al. (2012): dravitic tourmaline from -20 to -12 ‰, non-marine meta-evaporitic origin.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −14.9 ± 2.3 ‰ | −20.4 / −12.2 ‰ | 12 | disseminated tourmaline of the hematite-talc schist Mean and standard deviation recalculated from 12 analyses, -20.4 to -12.2 (#1 -12.8; #3 -12.3; #5 -15.6; #6 -20.4; #7 -14.1; #7b -15.3; #8 -14.5; #9 -17.0; #11 -13.4; x1 -15.3; x2 -15.5; x3 -12.2). Supplementary Table 7; labels: electron-microprobe analysis number (#7b, second spot on crystal #7; x1 to x3, crystals without microprobe analysis). Internal 1σ 0.3 to 0.4 ‰, true uncertainty about 1.5 ‰ according to the authors. The text rounds the range to -20 and -12 ‰. Fluid of -16 to -7 ‰ at 200-300 °C according to the authors. | Cabral et al. (2012), Talc mineralisation associated with soft hematite ore, Gongo Soco d… |
Deposits of the same type
- Carajás Brazil
- Isua (BIF) Greenland
- Gongchangling China
- Cauê Formation (Quadrilátero Ferrífero) Brazil
- Iron Quadrangle, high-grade hematite ores (western region) Brazil
- Iron Quadrangle, high-grade hematite ores (eastern region) Brazil
- Qidashan China
- Marjajärvi (Marjarova) Sweden
Cite this page
IsoFind Atlas (2026). Gongo Soco, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/gongo-soco/ (accessed 2026-10-20).
@misc{isofind2026gongosocoisotopesignatures,
title = {Gongo Soco, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/gongo-soco/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20