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Keywords = Frotet–Troilus domain

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24 pages, 5184 KB  
Article
Petrography and Geochemistry of the Intrusive Rocks at the Diorite-Hosted Regnault Au Mineralization
by Lucie Mathieu and Francis MacDonald
Minerals 2022, 12(2), 128; https://doi.org/10.3390/min12020128 - 23 Jan 2022
Cited by 3 | Viewed by 5655
Abstract
Archean greenstone belts are renowned for their Au endowment. Gold can be associated with orogenic Au style of mineralization and with diorite-hosted Au-Cu disseminated sulfides interpreted as a porphyry style of mineralization. The Regnault Au project, located in the Frotet–Evans greenstone belt (Superior [...] Read more.
Archean greenstone belts are renowned for their Au endowment. Gold can be associated with orogenic Au style of mineralization and with diorite-hosted Au-Cu disseminated sulfides interpreted as a porphyry style of mineralization. The Regnault Au project, located in the Frotet–Evans greenstone belt (Superior craton), is a structurally-controlled and diorite-hosted mineralization with an unclear metallogenic model. The aim of this study is to evaluate the fertility of the Regnault granodiorite-diorite-gabbro intrusive. Using whole-rock chemistry and petrological observations, it is concluded that the intrusive suite derives from a differentiated and water-bearing magma extracted from the metasomatized mantle. Amphibole chemistry indicates that the magma was moderately oxidized and that it emplaced at a shallow depth. It is concluded that the Regnault intrusive suite displays several characteristics favorable to the exsolution of magmatic fluids in the upper crust and that the Regnault Au mineralization potentially corresponds to, at least in part, a magmatic-hydrothermal system. Full article
(This article belongs to the Special Issue Magmatic-Hydrothermal Systems through Time)
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