Iron Quadrangle, high-grade hematite ores (eastern region)
Minas Gerais, Brazil
Banded iron formationsFe
- Type
- High-grade hematite ore in metamorphosed banded iron formation (itabirite)
High-grade hematite ores from the eastern border of the Iron Quadrangle, metamorphosed under amphibolite and locally granulite facies. The small quartz-hematite fractionations there reflect recrystallisation temperatures of 600 to 800 °C.
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 2.77 ± 2.76 ‰ | −2.7 / 9.7 ‰ | 71 | high-grade ore hematite Mean and standard deviation of 71 analyses. Appendix, mines Timbopeba, Germano-Samarco, Fazendão, Morro Jacutinga, Água Limpa, Rio Piracicaba, Morro Agudo, Espigão do Pico, Andrade, Piçarrão, Pico do Itacolomi. Hydrothermal fissure fillings are left out, as are Gouveia and Diamantina, outside the Quadrangle. The two regions differ only in their quartz: the iron oxide keeps the same composition. | Hoefs et al. (1982), Polymetamorphic relations in iron ores from the Iron Quadrangle, Bra… |
| 12.1 ± 3.27 ‰ | 6.3 / 19.6 ‰ | 71 | quartz associated with the ore Mean and standard deviation of 71 analyses. Appendix, same samples as the hematite. Hydrothermal fissure fillings are left out, as are Gouveia and Diamantina, outside the Quadrangle. | Hoefs et al. (1982), Polymetamorphic relations in iron ores from the Iron Quadrangle, Bra… |
Deposits of the same type
- Cauê Formation (Quadrilátero Ferrífero) Brazil
- Iron Quadrangle, high-grade hematite ores (western region) Brazil
- Carajás Brazil
- Isua (BIF) Greenland
- Isovaara (Masugnsbyn field) Sweden
- Marjajärvi (Marjarova) Sweden
- Jingshansi (Wuyang) China
- Qidashan China
Cite this page
IsoFind Atlas (2026). Iron Quadrangle, high-grade hematite ores (eastern region), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/quadrilatere-ferrifere-minerais-riches-en-hematite-region-est/ (accessed 2026-10-13).
@misc{isofind2026ironquadranglehighgradehemati,
title = {Iron Quadrangle, high-grade hematite ores (eastern region), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/quadrilatere-ferrifere-minerais-riches-en-hematite-region-est/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13