Associations of platinum-group minerals of the Noril'sk copper-nickel sulfide ores

Genkin, A. D.; Evstigneeva, T. L.

doi:10.2113/gsecongeo.81.5.1203

Cited by 80 publications

(74 citation statements)

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“…The geology and mineralogy of the Medevezhiy Ruchei mine were described by Distler et al (1999), and the deposits and PGE mineralization of the Noril'sk area, by Genkin (1968) and Distler (1994). The geology of the deposits in the Talnakh area has been described by many authors (e.g., Likhachev 1999), and the mineralogy, most recently by Kozyrev et al (2002).…”

Section: Samplesmentioning

confidence: 99%

Comparison of Lam Icp MS and Micro-Pixe Results for Palladium and Rhodium in Selected Samples of Noril'sk and Talnakh Sulfides

Cabri¹,

Sylvester²,

Tubrett³

et al. 2003

The Canadian Mineralogist

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Comparisons of PGE measurements by laser-ablation microprobe (LAM-ICP-MS) with micro-PIXE analyses on the same sulfide grains were made in order to assess data quality. Pyrrhotite, pentlandite and chalcopyrite from a few samples of disseminated ores of the Noril'sk I intrusion and massive ore from the Talnakh deposit, Russia, were analyzed for Pd and Rh by micro-PIXE and for all PGE by LAM-ICP-MS. Micro-PIXE analyses employed focused proton beams of 8 ϫ 15 m for grains in heavy-mineral separates and 15 ϫ 20 m for grains in hand samples. These represent analyzed volumes of about 2,350 m 3 in pyrrhotite and 5,900 m 3 for Pd in pentlandite. LAM analyses were performed with a focused, 266-nm laser beam fired at 0.3 mJ/ pulse and 10 Hz, resulting in 35-40 m spots and analyzed volumes of about 85,000 m 3 . Fused pyrrhotite standards separately doped with Pd, Ru, and Rh were synthesized for LAM-ICP-MS, and calibrated against sintered pyrrhotite PGE standards of Ballhaus & Sylvester (2000). The level of Pd, Ru and Rh varies by ~4 to 9% (1) in the fused pyrrhotite standards at a 50-m sampling scale. The LAM and micro-PIXE results for the natural sulfides are quite comparable, with the large majority of determinations falling within 33% of each other for both Pd and Rh on the same spot. This agreement is considered encouraging for use of the LAM-ICP-MS for trace PGE analysis, considering the large differences in volumes analyzed, and in probable trace-element heterogeneity in the grains and standards. The reasonable concordance of most Pd and Rh results by LAM-ICP-MS and micro-PIXE indicates the potential of the LAM-ICP-MS technique. LAM analyses of the natural sulfides for Pt, Ir and Os were made using the standards of Ballhaus & Sylvester (2000). Platinum is more enriched in pentlandite (n = 10) than in pyrrhotite (3.2 ± 1.2 versus 0.73 ± 0.60 ppm) from Noril'sk (MP6-97), but Ir (0.94 ± 0.32 versus 1.38 ± 0.13 ppm) is only slightly higher in pyrrhotite (n = 10), whereas Os (~0.5 ppm) is comparably enriched in both minerals. Noril'sk chalcopyrite contains trivial amounts of all PGE except Pd (6.6-15 ppm).Keywords: laser-ablation microprobe, ICP-MS, micro-PIXE, electron-probe micro-analysis, PGE standards, synthesis, sulfide minerals, palladium, rhodium, ruthenium, Noril'sk, Talnakh, Russia. SOMMAIRENous avons effectué une comparaison des mesures de concentrations des éléments du groupe du platine (EGP) par ablation au laser avec la méthode ICP-MS et par analyses micro-PIXE des même grains de sulfures, afin d'évaluer la qualité des données. La pyrrhotite, la pentlandite et la chalcopyrite de quelques échantillons de minerai disséminé provenant de l'intrusion Noril'sk I, et § Sylvester (2000). Les teneurs en Pd, Ru et Rh varient par moins de 4 à 9% (1) dans les étalons de pyrrhotite fondue à une échelle d'échantillonnage de 50 m. Les résultats obtenus pour les sulfures naturels par ablation au laser et par micro-PIXE se comparent bien, les déterminations étant concordantes à 33% ou mieux pour Pd et Rh sur la même ...

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Section: Samplesmentioning

confidence: 99%

Comparison of Lam Icp MS and Micro-Pixe Results for Palladium and Rhodium in Selected Samples of Noril'sk and Talnakh Sulfides

Cabri¹,

Sylvester²,

Tubrett³

et al. 2003

The Canadian Mineralogist

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“…In the opinion of Genkin & Evstigneeva (1986), differentiation of the magmatic sulfide melt during the formation of massive ores can lead to the separation of a large volume of Curich melt in which Pt, Pd, and other elements such as Sn, Pb, As, Sb and Bi become concentrated, together with volatile elements such as Cl. Crystallization of this melt will then produce bodies of massive chalcopyrite followed by a late episode of PGE mineralization containing Pt-Pd tellurides and bismuthotellurides.…”

Section: Pge and Pgm In The Hydrothermal Systemmentioning

confidence: 99%

Magmatic and Hydrothermal Platinum-Group Minerals and Base-Metal Sulfides in the Baula Complex, India

Augé

Salpeteur

Bailly

et al. 2002

The Canadian Mineralogist

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The 3 ϫ 0.5 km gabbro-hosted Precambrian Baula Complex, in Orissa, India, comprises a steeply dipping pyroxenite unit in tectonic contact to the east with a peridotite unit that contains three chromitite layers and that becomes pyroxene-rich eastward toward the top. The ultramafic formations are intruded by the Bangur Gabbro, the top of which entered a shear zone, forming a breccia zone. The breccia, 1 to 40 m thick and almost continuous along strike for 2000 m, shows extensive vertical and lateral variations. It is made up of ultramafic blocks of various sizes derived from the Baula Complex within a matrix of hydrothermally altered Bangur Gabbro. The brecciation process has affected one of the chromitite layers. Two categories of platinum-groupelement (PGE) mineralization have been observed in the Baula Complex, both associated with the Bangur Gabbro. The first (type 1) occurs within a sulfide-free magmatic environment within the Bangur Gabbro near its contact with the peridotite, and is clearly formed within a magmatic environment. The PGE-bearing rock contains relics of dunite and chromitite extracted mechanically from the ultramafic formations by the intrusive gabbro. This mineralization is dominated by Pt (Pt/Pd in the range 8-9), is anomalous in Rh, and the platinum-group-mineral (PGM) assemblage is dominated by isoferroplatinum, braggite and malanite, with sperrylite and laurite, included in pyroxene and plagioclase. The second category (types 2A and 2B) is restricted to the hydrothermally altered matrix of the breccia zone. Type 2A has PGE associated with base-metal mineralization; the PGE assemblages are characterized by Pd (Pt/Pd 0.5), and the PGM are mainly sudburyite, minerals of the system Pd-Bi-Te-Sb, and sperrylite. Type 2B is not associated with base metals, the PGE are characterized by Pt (Pt/Pd in the range 2-3), and PGM phases of the Pt-Sb-As system (geversite, sperrylite) coexist with Pd antimony (mertieite-II). The PGE minerals form discrete grains, a) in the hydrous silicate matrix (commonly as clusters) without base-metal sulfides (BMS) or in the silicate matrix accompanying BMS trails, where they are in some cases adjacent to disseminated BMS, b) within ferrian chromite, c) within BMS in silicates, and d) within or adjacent to BMS in ferrian chromite. We present the results of electron-microprobe analyses of the PGM and BMS phases, and propose a model in which type-1 mineralization results from an orthomagmatic episode, whereas the type-2 mineralization is a result of hydromagmatic processes affecting the gabbroic matrix of the complex breccia zone.

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“…Le filon-couche Delta 3 est pré-cisaillement mais on ne peut établir avec certitude sa chronologie par rapport aux autres intrusions. A Noril'sk (Genkin et Evstigneeva, 1986) …”

Section: Les Biotitesunclassified

Geologie et caracteristiques geochimiques des mineralisations Ni-Cu-EGP de la region de Delta ceinture de Cape-Smith Nouveau-Quebec

Giovenazzo¹

1991

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Associations of platinum-group minerals of the Noril'sk copper-nickel sulfide ores

Cited by 80 publications

References 0 publications

Comparison of Lam Icp MS and Micro-Pixe Results for Palladium and Rhodium in Selected Samples of Noril'sk and Talnakh Sulfides

Comparison of Lam Icp MS and Micro-Pixe Results for Palladium and Rhodium in Selected Samples of Noril'sk and Talnakh Sulfides

Magmatic and Hydrothermal Platinum-Group Minerals and Base-Metal Sulfides in the Baula Complex, India

Geologie et caracteristiques geochimiques des mineralisations Ni-Cu-EGP de la region de Delta ceinture de Cape-Smith Nouveau-Quebec

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