Multiple sulfur isotope and mineralogical constraints on the genesis of Ni-Cu-PGE magmatic sulfide mineralization of the Monchegorsk Igneous Complex, Kola Peninsula, Russia

Bekker, Andrey; Grokhovskaya, T. L.; Hiebert, R. S.; Шарков, Е. В.; Bui, Tien D.; Stadnek, K. R.; Chashchin, V. V.; Wing, Boswell A.

doi:10.1007/s00126-015-0604-1

Cited by 17 publications

(8 citation statements)

References 51 publications

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“…Only sample 79-145, which is in direct contact with the host metasediment, has a slightly elevated La/Nb ratio, indicating that the extent of in situ contamination is confined to the immediate surroundings. This is further supported by Bekker et al (2016), who noted a slightly stronger massindependent fractionation of sulfur isotopes in NKT Massif samples from the intrusion contact relative to those from the intrusion center.…”

Section: Emplacement Mode: Liquid or Crystal-mush?supporting

confidence: 63%

Critical Controls on the Formation of Contact-Style PGE-Ni-Cu Mineralization: Evidence from the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia

et al. 2018

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The Paleoproterozoic Monchegorsk Complex, located in the Russian part of the Fennoscandian Shield, constitutes one of the largest mafic-ultramafic layered intrusions in Europe. The complex hosts extensive contact-style PGE-Ni-Cu sulfide mineralization along its margin, irrespective of the host lithology, which ranges from peridotite to pyroxenite and gabbronorite. The mineralized intervals reach up to 3 ppm Pt + Pd and attain a thickness of up to 50 m in the central portions of the intrusion, thinning towards the periphery. Our study shows that the key process controlling the size and grade of a contactstyle deposit in the Monchegorsk Complex, was the efficiency of sulfide collection in distinct zones of the intrusion. Strongly mineralized basal contacts are always associated with intense brecciation and the presence of large amounts of felsic pegmatite, suggesting a multi-stage emplacement of the mafic-ultramafic succession. Thermal modeling demonstrates that multiple episodes of magma influx are required to allow for significant partial melting of the basement. Moreover, the interaction between magma and basement led to the local addition of water and potentially carbon dioxide to the magma, resulting in partial melting of cumulus phases and a reduction in viscosity of the interstitial melt. This increased the porosity of the mush in the vicinity of the lower intrusion contact, which promoted preferential sulfide liquid accumulation at the base, while the local decrease in magma viscosity facilitated gravitational settling of sulfide droplets. These factors led to an efficient collection of sulfide liquid, especially in the center of the complex, where permeability was maintained the longest due to slower cooling relative to more peripheral parts.

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Section: Emplacement Mode: Liquid or Crystal-mush?supporting

confidence: 63%

Critical Controls on the Formation of Contact-Style PGE-Ni-Cu Mineralization: Evidence from the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia

et al. 2018

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“…We hope to continue the discussion about the origin of the diverse sulfide mineralization in the Monchegorsk complex, which has begun in recent years (e.g., Bekker et al 2015;Yang et al 2016;Karykowski et al 2018). The most interesting are the following questions.…”

Section: Future Prospectsmentioning

confidence: 90%

Contact-style PGE-Cu-Ni mineralization: from genetic models to prospects

Groshev¹,

Karykowski²,

Maier³

et al. 2022

The Fennoscandian School of Ore Genesis in Layered Intrusions. Online Workshop 2

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“…The Monchegorsk ore field includes rocks of the ore-bearing layered Monchepluton, gabbro-anorthosite massifs of the Main Ridge (Monchetundra and Chunatundra), small intrusions of the Ostrovskoy massif and Yarva-Varaka, and dikes cutting through the Monchepluton [38,63,64]. The complex had been forming during a long period of time in the interval of 2.51-2.46 Ga [36,37,64].…”

Section: Monchegorsk 25 Ga Ore Fieldmentioning

confidence: 99%

“…The complex is made up of dunites, harzburgites, orthopyroxenites (NKT), orthopyroxenites (Sopcha), norites (Nyud), and gabbronorites (Poaz and Vurechuaivench) that form a single syngenetic rock series. It is distinctly differentiated both vertically and horizontally, which is generally expressed in the reduced rock basicity from the bottom up and from west to east [38,63,64].…”

Section: Monchegorsk 25 Ga Ore Fieldmentioning

confidence: 99%

The Sulfide/Silicate Coefficients of Nd and Sm: Geochemical “Fingerprints” for the Syn- and Epigenetic Cu-Ni-(PGE) Ores in the NE Fennoscandian Shield

Serov

Bayanova

2021

Minerals

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One of the current directions of the Sm-Nd isotope systematics development is a dating of the ore process using sulfide minerals. Yet, the issue of the existence of rare earth elements (REE) in sulfides is still a matter for discussion. Sulfides from ore-bearing rocks of Proterozoic (2.53–1.98 Ga) Cu-Ni and platinum group elements (PGE) deposits of the Fennoscandian Shield were studied. It is found that the most probable source of REE in sulfide minerals from Cu-Ni-PGE complexes could be submicronic fluid inclusions, which are trapped at the mineral crystallization stage. In such a case, fluid or melt inclusions are specimens of the syngenetic parental melt, from which the base mineral formed, and these reflect a composition of the parental fluid. The mineral–rock partition coefficients for Nd and Sm can be used as “fingerprints” for individual deposits, and these are isotope-geochemical indicators of the ore-caused fluid that is syngenetic to sulfide. Moreover, the DNd/DSm ratio for various sulfide minerals can be used as a prospective geochemical tool for reconstructing a mineral formation sequence in ore complexes. On the other hand, differences in isotope compositions of sulfide neodymium could be markers of some ore-caused fluids and related to certain generations of sulfide minerals.

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Multiple sulfur isotope and mineralogical constraints on the genesis of Ni-Cu-PGE magmatic sulfide mineralization of the Monchegorsk Igneous Complex, Kola Peninsula, Russia

Cited by 17 publications

References 51 publications

Critical Controls on the Formation of Contact-Style PGE-Ni-Cu Mineralization: Evidence from the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia

Critical Controls on the Formation of Contact-Style PGE-Ni-Cu Mineralization: Evidence from the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia

Contact-style PGE-Cu-Ni mineralization: from genetic models to prospects

The Sulfide/Silicate Coefficients of Nd and Sm: Geochemical “Fingerprints” for the Syn- and Epigenetic Cu-Ni-(PGE) Ores in the NE Fennoscandian Shield

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