Scaled Analogue Modelling Applied to Magmatic Sulphide Deposits: Why? And What’s Next?

Saumur, B.M.; Vachon, L. et Killian, M. (2023). « Scaled Analogue Modelling Applied to Magmatic Sulphide Deposits: Why? And What’s Next? », dans Lesher, M. (2023). GAC-MAC-SGA 2023 Sudbury Meeting: Abstracts, Volume 46. Geoscience Canada, 50(3), 105–237. (GAC-MAC-SGA, Sudbury, 24-29 mai 2023) p. 212.

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Résumé

Intrusion-hosted magmatic sulphide deposits are complex dynamic systems. The transport and accumulation of sulphide are controlled by several physical parameters, among which are the rheology and density of two immiscible fluids, the velocities of these fluids and the geometry of the system. In the last decade, numerical models have provided important insight on these problems. Scaled analogue modelling is complementary to the numerical approach, and used to ensure that studied geological phenomena are consistent with the physical properties of the components of the system. Immiscible liquids (oil vs. water based) of varying or adjustable density and viscosity, are readily available and provide potential for the scaled analysis of bimodal sulfide liquid – silicate magma systems. Analogue modelling was used in the early 2000s to analyse the evolution of sulphide droplets in magma chambers. More recently, scaled models tested whether accumulated sulphide liquid could be entrained by silicate magma; results suggest that, although coherent pulses of sulphide liquid could be generated by in highly dynamic systems, downward percolation of dense sulphide liquid likely accounts for indications of sulphide-rich magma pulses at many mineral deposits. Next steps include the analysis of the role of conduit geometry on the evolution of sulphide liquid, which will be performed in scaled experiments with analogue silicate magmas of varying density and viscosity, at various flow rates.

Type:	Communication, article de congrès ou colloque
Mots-clés ou Sujets:	modélisation analogique, minéraux critiques, nickel, cuivre, platinoïdes
Unité d'appartenance:	Faculté des sciences > Département des sciences de la Terre et de l'atmosphère
Déposé par:	Benoit Saumur
Date de dépôt:	10 mars 2025 08:16
Dernière modification:	10 mars 2025 08:16
Adresse URL :	http://archipel.uqam.ca/id/eprint/18548

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