Monchegorsk (Monchepluton)
Murmansk Oblast (central Kola Peninsula), Russia
Magmatic (Ni-Cu-PGE, carbonatites)Ni-Cu (EGP, Cr)
- Type
- Magmatic Ni-Cu-PGE sulphides (Palaeoproterozoic layered intrusion)
Mafic-ultramafic Monchegorsk massif (Monchepluton and Monchetundra), extension of the Imandra-Varzuga belt between the Kola and Belomorian blocks, dated at about 2.45 Ga (U-Pb); gabbros, peridotites and dunites mineralised in Cr, Ni, Fe, Ti, V and PGE (sperrylite). Pentlanditovaya Ushchelie gabbronorites, at the base of the pluton: 2489 ± 49 Ma (Sm-Nd) and 2501 ± 5.6 Ma (U-Pb). Several sulphide generations: magmatic pentlandite and Fe-Ti oxides, then pyrite and chalcopyrite, finally pyrrhotite; massive ore and breccias with quartz-sulphide cement in fault zones. Nickel sulphides close to 0 ‰ would be the most primary; more positive values would reflect contamination by supracrustal sulphur and reworking between 2.5 and 2.0 Ga according to the authors. Indicative coordinates (town of Monchegorsk).
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.92 ‰ | 1 | peridotite pentlandite (sample 01) Single analysis; nickel sulphide close to magmatic sulphur according to the authors. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… | |
| 5.74 ‰ | 1 | pyrite with bornite and pyrrhotite admixtures, peridotite (sample 01) Single analysis, the most positive of the set: contamination by supracrustal sulphur according to the authors. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… | |
| 2.18 ‰ | 1 | massive sulphide ore pentlandite (sample 02) Single analysis. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… | |
| 1.36 ‰ | 1 | massive sulphide ore pyrite (sample 02) Single analysis. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… | |
| 1.55 ± 1.37 ‰ | 0.58 / 2.52 ‰ | 2 | massive sulphide ore chalcopyrite (sample 02) Mean and standard deviation recalculated from 2 analyses, large spread within one sample, ascribed to several sulphide generations. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… |
| 1.47 ± 1.69 ‰ | 0.04 / 3.34 ‰ | 3 | pentlandite of the quartz-cemented breccia (sample 03) Mean and standard deviation recalculated from 3 analyses, departures from magmatic sulphur ascribed to secondary processes according to the authors. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… |
| 1.19 ± 0.63 ‰ | 0.75 / 1.64 ‰ | 2 | pyrite of the quartz-cemented breccia (sample 03) Mean and standard deviation recalculated from 2 analyses. | Huber et al. (2016), Stable isotope geochemistry of sulfides from intrusion in Monchegors… |
Deposits of the same type
- Pechenga Russia
- Keliber (Central Ostrobothnia) Finland
- Varuträsk Sweden
- Échassières (Beauvoir granite) France
- Montebras France
- Abu Dabbab Égypte
- Eastern Desert (Mueilha, Igla, Nuweibi) Égypte
- Golpejas Spain
Cite this page
IsoFind Atlas (2026). Monchegorsk (Monchepluton), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/monchegorsk-monchepluton/ (accessed 2026-10-14).
@misc{isofind2026monchegorskmoncheplutonisotop,
title = {Monchegorsk (Monchepluton), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/monchegorsk-monchepluton/},
note = {Accessed 2026-10-14}
}Updated : 2026-10-14