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Magnetite chemistry by LA-ICP-MS records sulfide fractional crystallization in massive nickel-copper-platinum group element ores from the Norilsk-Talnakh Mining District (Siberia, Russia): Implications for trace element partitioning into magnetite

Duran Charley J., Barnes Sarah-Jane, Mansur Eduardo T., Dare Sarah A. S., Bédard L. Paul et Sluzhenikin Sergey F.. (2020). Magnetite chemistry by LA-ICP-MS records sulfide fractional crystallization in massive nickel-copper-platinum group element ores from the Norilsk-Talnakh Mining District (Siberia, Russia): Implications for trace element partitioning into magnetite. Economic Geology, 115, (6), p. 1245-1266.

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URL officielle: http://dx.doi.org/doi:10.5382/econgeo.4742

Résumé

Mineralogical and chemical zonations observed in massive sulfide ores from Ni-Cu-platinum group element (PGE) deposits are commonly ascribed to the fractional crystallization of monosulfide solid solution (MSS) and intermediate solid solution (ISS) from sulfide liquid. Recent studies of classic examples of zoned orebodies at Sudbury and Voisey’s Bay (Canada) demonstrated that the chemistry of magnetite crystallized from sulfide liquid was varying in response to sulfide fractional crystallization. Other classic examples of zoned Ni-Cu-PGE sulfide deposits occur in the Norilsk-Talnakh mining district (Russia), yet magnetite in these orebodies has received little attention. In this contribution, we document the chemistry of magnetite in samples from Norilsk-Talnakh, spanning the classic range of sulfide composition, from Cu poor (MSS) to Cu rich (ISS). Based on textural features and mineral associations, four types of magnetite with distinct chemical composition are identified: (1) MSS magnetite, (2) ISS magnetite, (3) reactional magnetite (at the sulfide-silicate interface), and (4) hydrothermal magnetite (resulting from sulfide-fluid interaction). Compositional variability in lithophile and chalcophile elements records sulfide fractional crystallization across MSS and ISS magnetites and sulfide interaction with silicate minerals (reactional magnetite) and fluids (hydrothermal magnetite). Estimated partition coefficients for magnetite in sulfide systems are unlike those in silicate systems. In sulfide systems, all lithophile elements are compatible and chalcophile elements tend to be incompatible with magnetite, but in silicate systems some lithophile elements are incompatible and chalcophile elements are compatible with magnetite. Finally, comparison with magnetite data from other Ni-Cu-PGE sulfide deposits pinpoints that the nature of parental silicate magma, degree of sulfide evolution, cocrystallizing phases, and alteration conditions influence magnetite composition.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:115
Numéro:6
Pages:p. 1245-1266
Version évaluée par les pairs:Oui
Date:1 Septembre 2020
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:alteration, Asia, assimilation, chalcophile elements, chemical composition, Commonwealth of Independent States, copper ores, crystal chemistry, crystallization, cubanite, equations, fractional crystallization, altération, Asie, assimilation, éléments chalcophiles, composition chimique, Communauté des États indépendants, minerais de cuivre, chimie cristalline, cristallisation, cubanite, équations, cristallisation fractionnée
Déposé le:09 juin 2021 19:45
Dernière modification:09 juin 2021 19:45
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