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Hydrothermal history and gold mineralization at the Lalor volcanogenic massive sulphide deposit, Snow Lake camp, Manitoba, Canada.

Caté, Antoine; Mercier-Langevin, Patrick; Ross, Pierre-Simon; Gagné, Simon (2015). Hydrothermal history and gold mineralization at the Lalor volcanogenic massive sulphide deposit, Snow Lake camp, Manitoba, Canada. In: 13th SGA Biennial Meeting on Mineral Resources in a Sustainable World - SGA 2015, 24-27 août 2015, Nancy, France.

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Résumé

The Lalor deposit is a newly developed Volcanogenic Massive Sulphide (VMS) deposit in the Snow Lake camp, Manitoba. The deposit is hosted in a complexly deformed and metamorphosed rock package referred to as the Lalor volcanic succession and located in the VMS-prospective Chisel sequence of the Snow Lake arc assemblage. The Lalor deposit consists of stratigraphically and structurally stacked Zn-rich, Au-rich and Cu-Au-rich ore lenses gently dipping toward the NNE. The Lalor volcanic succession has undergone extensive syn-VMS hydrothermal alteration and subsequent polyphase deformation and amphibolite grade metamorphism. Metamorphosed hydrothermal alteration styles have been classified into chemical associations (K, K-Mg-Fe, Mg-Fe and Mg-Ca). Mapping of the host volcanic rocks, chemical associations and ore lenses at Lalor indicates that: 1) the Zn-rich massive sulphide lenses are preferentially associated with K and Mg-Ca alteration zones, 2) the Zn-rich massive sulphide lenses formed at two distinct stratigraphic positions as a result of protracted seafloor/sub-seafloor hydrothermal activity, 3) the Cu-Au-rich zones at depth are associated with transposed discordant Mg-Fe altered rocks and presumably represent footwall feeders, and 4) Au was introduced as part of the VMS-forming event, probably during a late, low-temperature pulse and was locally remobilized into sulphide-poor ore zones during the main deformation events.

Type de document: Document issu d'une conférence ou d'un atelier
Mots-clés libres: VMS; gold; alteration; metamorphism; Snow Lake; Lalor deposit
Centre: Centre Eau Terre Environnement
Date de dépôt: 09 déc. 2019 19:47
Dernière modification: 09 déc. 2019 19:47
URI: http://espace.inrs.ca/id/eprint/4301

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