Sossego
Pará, Canaã dos Carajás (Carajás Mineral Province), Brazil
IOCGCu-Au
- Type
- Iron oxide-copper-gold (IOCG)
Regional WNW-ESE shear zone at the contact between metavolcano-sedimentary units of the Itacaiúnas Supergroup (about 2.76 Ga) and tonalitic to trondhjemitic gneisses and migmatites of the Xingu Complex (about 2.8 Ga); 245 Mt at 1.1 % Cu and 0.28 g/t Au. Two groups of ore bodies separated by a fault with large vertical offset: Pista-Sequeirinho-Baiano (regional sodic alteration, sodic-calcic actinolite alteration with magnetite-apatite bodies, then mineralisation with epidote, chlorite, allanite, calcite and quartz) and Sossego-Curral (weak albite, potassic biotite-K-feldspar alteration grading to chlorite, chalcopyrite breccias, late hydrolytic sericite-hematite alteration). Isotopic temperatures from 550 ± 25 °C (actinolite-magnetite) to 190 ± 25 °C; fluid δ18O from +8.7 to -4.2 ‰: hot 18O-rich fluids, then influx of 18O-depleted, probably meteoric fluids during mineralisation according to the authors; chalcopyrite δ34S of +2.2 to +7.6 ‰. Coordinates from Mindat (Pista pit).
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 6.5 ± 1.21 ‰ | 5.4 / 7.8 ‰ | 3 | albite of sodic and sodic-calcic alteration, Sequeirinho ore body Mean and standard deviation recalculated from 3 analyses, fluid +3.6 to +6.0 ‰ (450 to 500 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 9.55 ± 0.35 ‰ | 9.3 / 9.8 ‰ | 2 | silicification quartz, Sequeirinho ore body Mean and standard deviation recalculated from 2 analyses, fluid +4.8 and +5.2 ‰ (400 °C), synchronous with shear zones. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 5.12 ± 0.42 ‰ | 4.8 / 5.9 ‰ | 6 | actinolite of sodic-calcic alteration and actinolitite, Sequeirinho ore body Mean and standard deviation recalculated from 6 analyses, fluid +5.9 to +7.7 ‰ (500 to 550 °C); actinolite-magnetite pairs at 517-574 °C. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −0.2 ± 0.25 ‰ | −0.7 / 0 ‰ | 6 | magnetite of actinolitite and magnetite bodies, Sequeirinho ore body Mean and standard deviation recalculated from 6 analyses, fluid +6.1 to +6.8 ‰ (550 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 2.8 ‰ | 1 | zoned actinolite of breccia infill, Sequeirinho ore body Single analysis; fluid +3.4 ‰ (400 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| 2.17 ± 1.63 ‰ | 0.9 / 4 ‰ | 3 | chlorapatite of breccia infill, Sequeirinho ore body Mean and standard deviation recalculated from 3 analyses, small apatite-water fractionation: fluid +0.9 to +4.0 ‰ (400 °C), meteoric or retrograde re-equilibration according to the authors. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 0 ‰ | 1 | ore breccia epidote (SOS 38C), Sequeirinho ore body Single analysis; fluid -2.9 ‰ (230 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| 5.95 ± 0.07 ‰ | 5.9 / 6 ‰ | 2 | ore breccia quartz, Sequeirinho ore body Mean and standard deviation recalculated from 2 analyses, fluid -4.1 and -4.0 ‰ (230 °C): influx of 18O-depleted fluid. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 6.28 ± 1.12 ‰ | 5.07 / 7.43 ‰ | 4 | ore breccia calcite, Sequeirinho ore body Mean and standard deviation recalculated from 4 analyses, two values from Monteiro et al. (2004a); fluid -1.5 to +0.8 ‰ (230 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 0.35 ± 0.78 ‰ | −0.2 / 0.9 ‰ | 2 | early vein and breccia magnetite, Baiano ore body Mean and standard deviation recalculated from 2 analyses, fluid +8.7 and +7.6 ‰ (400 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 0.3 ± 0.42 ‰ | 0 / 0.6 ‰ | 2 | late vein epidote, Baiano ore body Mean and standard deviation recalculated from 2 analyses, fluid -4.1 and -4.2 ‰ (200 °C); the text gives 0.0 to 0.3 ‰ for epidote. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 9.17 ± 5.48 ‰ | 4.99 / 18.26 ‰ | 6 | calcite of veins cutting gabbro, Sequeirinho and Baiano ore bodies Mean and standard deviation recalculated from 6 analyses, the only set with δ13C-δ18O covariation; fluid -1.0 to +12.2 ‰ (240 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 5.1 ‰ | 1 | potassic alteration K-feldspar (Sos 802), Sossego-Curral ore bodies Single analysis; fluid +3.6 ‰ (460 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| 0.5 ± 1.84 ‰ | −0.8 / 1.8 ‰ | 2 | vein and breccia magnetite, Sossego-Curral ore bodies Mean and standard deviation recalculated from 2 analyses, fluid +9.7 and +7.1 ‰ (400 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 4.5 ± 0.71 ‰ | 3.6 / 5.3 ‰ | 4 | vein and breccia actinolite, Sossego-Curral ore bodies Mean and standard deviation recalculated from 4 analyses, fluid +4.6 to +6.4 ‰ (400 °C), out of equilibrium with magnetite. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 6.6 ± 4.73 ‰ | 2.8 / 15.2 ‰ | 6 | vein and breccia chlorapatite, Sossego-Curral ore bodies Mean and standard deviation recalculated from 6 analyses, 35/159.00 (+9.0 ‰) and 419/56.73 (+15.2 ‰) are probable disequilibrium values according to the authors. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 7.7 ‰ | 1 | mineralisation quartz (314/202.70), Sossego-Curral ore bodies Single analysis; fluid +0.4 ‰ (275 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| −1.8 ‰ | 1 | post-mineralisation chlorite (319/113.92), Sossego-Curral ore bodies Single analysis; fluid -5.5 ‰ (250 °C), hydrolytic alteration. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| 7.33 ± 0.71 ‰ | 6.1 / 8.22 ‰ | 8 | calcite I of mineralised veins and breccias, Sossego-Curral ore bodies Mean and standard deviation recalculated from 8 analyses, five values from Monteiro et al. (2004a); fluid +4.1 to +6.2 ‰ (400 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 5.8 ± 0.88 ‰ | 5.06 / 8.46 ‰ | 14 | main-mineralisation calcite II, Sossego-Curral ore bodies Mean and standard deviation recalculated from 14 analyses, eight values from Monteiro et al. (2004a); fluid +0.2 to +3.6 ‰ (275 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 5.26 ± 0.38 ‰ | 4.81 / 5.63 ‰ | 4 | post-mineralisation calcite III, Sossego-Curral ore bodies Mean and standard deviation recalculated from 4 analyses, values from Monteiro et al. (2004a); fluid -1.0 to -0.1 ‰ (250 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −5.58 ± 0.69 ‰ | −6.44 / −4.77 ‰ | 4 | ore breccia calcite, Sequeirinho ore body Mean and standard deviation recalculated from 4 analyses. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −5.84 ± 1.6 ‰ | −8.35 / −3.76 ‰ | 6 | calcite of veins cutting gabbro, Sequeirinho and Baiano ore bodies Mean and standard deviation recalculated from 6 analyses. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −6.13 ± 0.73 ‰ | −7.64 / −5.36 ‰ | 8 | calcite I of mineralised veins and breccias, Sossego-Curral ore bodies Mean and standard deviation recalculated from 8 analyses. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −5.5 ± 0.44 ‰ | −6.03 / −4.73 ‰ | 14 | main-mineralisation calcite II, Sossego-Curral ore bodies Mean and standard deviation recalculated from 14 analyses. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −4.73 ± 0.44 ‰ | −5.08 / −4.13 ‰ | 4 | post-mineralisation calcite III, Sossego-Curral ore bodies Mean and standard deviation recalculated from 4 analyses. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
δD in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −71.06 ± 2.65 ‰ | −76 / −68 ‰ | 8 | actinolite of sodic-calcic alteration, actinolitite and breccias, Sequeirinho ore body Mean and standard deviation recalculated from 8 analyses, 99/296.07 averaged over two analyses (-71 and -70 ‰); SOS 10A (-76 ‰) represents regional alteration; fluid -47 to -39 ‰. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −6 ‰ | 1 | ore breccia epidote (38C), Sequeirinho ore body Single analysis; calculated fluid of +19 ‰ deemed unrealistic by the authors (retrograde re-equilibration of epidote). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| −7.5 ± 3.54 ‰ | −10 / −5 ‰ | 2 | late vein epidote in gabbro, Baiano ore body Mean and standard deviation recalculated from 2 analyses, calculated fluids of +10 to +15 ‰ deemed unrealistic by the authors. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −75.62 ± 9.96 ‰ | −90.5 / −70 ‰ | 4 | vein and breccia actinolite, Sossego-Curral ore bodies Mean and standard deviation recalculated from 4 analyses, 419/136.94 averaged over two analyses (-93 and -88 ‰); fluid -62 to -41 ‰ (400 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| −63 ‰ | 1 | post-mineralisation chlorite (319/113.92), Sossego-Curral ore bodies Single analysis; fluid -35 ‰ (250 °C). | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 3.94 ± 1.04 ‰ | 2.9 / 6.3 ‰ | 14 | chalcopyrite, Sequeirinho ore body Mean and standard deviation recalculated from 14 analyses, 14 analyses in Table 7; the text quotes 4.6 ± 1.6 ‰ (n = 15), not reproduced; massive breccia chalcopyrite (39D, 39K) up to +6.3 ‰. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 3.5 ‰ | 1 | ore breccia pyrite (99/304.23), Sequeirinho ore body Single analysis; lighter than the adjacent chalcopyrite (+4.2 ‰), the reverse of equilibrium: later chalcopyrite. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| 5.6 ± 0.71 ‰ | 5.1 / 6.1 ‰ | 2 | chalcopyrite of calcite veins in altered gabbro, Baiano ore body Mean and standard deviation recalculated from 2 analyses. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 2.4 ± 0.27 ‰ | 2.2 / 2.8 ‰ | 4 | chalcopyrite of veinlets along the mylonitic foliation, Pista ore body Mean and standard deviation recalculated from 4 analyses, the lowest values of the deposit; associated molybdenite at +2.4 ‰. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
| 2.4 ‰ | 1 | molybdenite of a chalcopyrite veinlet (SOS 346/85.00), Pista ore body Single analysis. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… | |
| 5.43 ± 1.1 ‰ | 3.8 / 7.6 ‰ | 25 | vein and breccia chalcopyrite, Sossego-Curral ore bodies Mean and standard deviation recalculated from 25 analyses, the text quotes 5.7 ± 1.9 ‰ (n = 25); the highest values (> 6 ‰) in calcite III veins. | Monteiro et al. (2008), Spatial and temporal zoning of hydrothermal alteration and minera… |
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Cite this page
IsoFind Atlas (2026). Sossego, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/sossego/ (accessed 2026-10-14).
@misc{isofind2026sossegoisotopesignatures,
title = {Sossego, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/sossego/},
note = {Accessed 2026-10-14}
}Updated : 2026-10-14