Gold emplacement and hydrothermal alteration in metabasic rocks at the Mouska Mine, Bousquet District, Abitibi, Quebec, Canada

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doi: 10.2113/gscanmin.42.4.1079
Authors:Belkabir, Abdelhay; Hubert, Claude; Hoy, Larry D.
Author Affiliations:Primary:
Faculté des Sciences et Techniques de Marrakech, Département de Géologie, Marrakech, Morocco
Université de Montreal, Canada
Volume Title:Canadian Mineralogist
Source:The Canadian Mineralogist, Vol.42(Part 4), p.1079-1096. Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada. ISSN: 0008-4476
Publication Date:2004
Note:In English. 45 refs.; illus., incl. 3 tables
Summary:The Mouska mine in the Abitibi greenstone belt exploits a sulphide-rich quartz-vein-type gold deposit hosted by a metavolcanic sequence of basalt and andesite. The ore zones are lenses of massive and disseminated sulphides and quartz veins. Microscopic to visible gold is hosted by both sulphide and quartz veins. The ore minerals are pyrrhotite, chalcopyrite and minor pyrite; there are two pyrite generations, only the first containing micro-inclusions of gold. The gold micro-inclusions have Ag 4-6 % whereas gold in any other habit has Ag up to 25 %. The variably altered and deformed metabasic rocks of the Mouska deposit show both distal and proximal alteration haloes. Such haloes result from a complex and progressive interaction between hydrothermal-predeformational (sulphide event) and tectonometamorphic (quartz event) imprints. Mineralogical, geochemical and isotopic studies show that the mafic protoliths have undergone several transformations during the Au-sulphide and Au-quartz depositions. In the proximal alteration, mass-balance calculations display a clear addition of K, which may account for the observed enrichment in biotite and white mica towards the ore zones. Substantial addition of SiO2 occurred only in the altered basalts, ascribed to the massive destruction of ferromagnesian minerals. [R.A.H.]
Sections:Economic minerals and ore deposits; Geochemistry
Subsections:Metallic deposits: specific; Minerals and ores
Subjects:Andesites; Archean; Basalts; Behavior; Chemical composition; Concentration; Emplacement; Geochemistry; Gold; Gold ores; Hydrothermal alteration; Igneous rocks; Inclusions; Isotope ratios; Isotopes; Mafic composition; Metal ores; Metals; Metamorphic rocks; Metasomatism; Mineral composition; Mineralization; O-18/O-16; Ore minerals; Oxygen; Paragenesis; Precambrian; Protoliths; Quartz veins; S-34/S-32; Stable isotopes; Sulfides; Sulfur; Veins; Volcanic rocks; Abitibi Belt; Canada; Canadian Shield; Eastern Canada; North America; Quebec; Superior Province; Bouaquet mining district; Mouska Mine
Abstract Numbers:04M/4300
Record ID:2005064569
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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