GEOSCIENCE WEBINAR #5 The state of Pd in pentlandite from Bushveld, Lac-des-Îles, and Noril’sk ores using X-ray absorption spectroscopyG

The state of Pd in pentlandite from Bushveld, Lac-des-Îles, and Noril’sk ores using X-ray absorption spectroscopy

Speaker: Olga Filimonova

Friday, March 6th at 16:15 in the auditorium

Co-authors: Sarah-Jane Barnes, Oier Bikondoa, Blanka Detlefs, Denis Fougerouse, Pieter Glatzel, Simon Goldmann, Malte Junge, Jacopo Orsilli, Didier Wermeille

Abstract
Pentlandite (Fe,Ni)₉S₈ is one of the principal host minerals of Pd in Ni and PGE deposits (Mansur et al. 2021). Yet the mechanism of Pd incorporation into pentlandite remains highly disputed (Junge et al., 2015; Helmy et al. 2021; Brovchenko et al. 2023) leaving the key question on whether Pd in pentlandite forms a solid solution or/and inclusions.

Here we report new insights into the state of Pd – its distribution, oxidation state, and local atomic environment – based on the atom probe tomography (APT) and X-ray absorption spectroscopy (XAS) investigations of Pd-bearing pentlandites from the ores of three world-class deposits: Bushveld, Lac-des-Îles, and Noril’sk I.

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References

Brovchenko, V., Merkulova, M., Sittner, J., Shilovskih, V., Borca, C., Huthwelker, T., Sluzhenikin, S. F. & Cnudde, V., 2023. X-ray absorption spectroscopic study of Pd2+ on Ni site in pentlandite. American Mineralogist 108(11), 2086–2095.

Helmy, H. M., Botcharnikov, R., Ballhaus, C., Wirth, R., Schreiber, A. & Buhre, S., 2023. How Pt and Pd are hosted in magmatic sulfides, substitutions and/or inclusions? Contributions to Mineralogy and Petrology 178(7), 41.

Junge, M., Wirth, R., Oberthür, T., Melcher, F. & Schreiber, A., 2015. Mineralogical siting of platinum-group elements in pentlandite from the Bushveld Complex, South Africa. Mineralium Deposita 50(1), 41-54.

Mansur, E. T., Barnes, S. J. & Duran, C. J., 2021. An overview of chalcophile element contents of pyrrhotite, pentlandite, chalcopyrite, and pyrite from magmatic Ni-Cu-PGE sulfide deposits. Mineralium Deposita 56(1), 179–204.