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TitleAccessory mineral thermobarometry, trace element chemistry, and stable O isotope systematics, Mooshla Intrusive Complex (MIC), Doyon-Bousquet-LaRonde mining camp, Abitibi greenstone belt, Québec
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorNeyedley, K; Hanley, J J; Zajacz, Z; Fayek, M
SourceTargeted Geoscience Initiative 5: grant program final reports (2018-2020); by Targeted Geoscience Initiative Coordination Office; Geological Survey of Canada, Open File 8755, 2021 p. 149-168, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: grant program final reports (2018-2020)
File formatpdf; xlsx (Microsoft® Excel®)
NTS32D/02NE; 32D/07SE
Lat/Long WENS -78.5903 -78.5011 48.2822 48.2489
Subjectseconomic geology; mineralogy; geochemistry; tectonics; Science and Technology; Nature and Environment; mineral exploration; mineral deposits; gold; copper; volcanogenic deposits; sulphide deposits; vein deposits; ore mineral genesis; mineralization; thermobarometry; thermal analyses; pressure-temperature conditions; crystallization; oxidation; isotopic studies; oxygen isotopes; greenstone belts; tectonic setting; magmatism; intrusions; emplacement; hydrothermal systems; fluid dynamics; trace element geochemistry; textural analyses; models; zircon; titanite; quartz; rutile; anhydrite; epidote; mass spectrometer analysis; petrographic analyses; tectonic setting; Archean; Mooshla Intrusive Complex; Doyon-Bousquet-LaRonde Mining Camp; Abitibi Greenstone Belt; Bousquet Formation; Precambrian
Illustrationsgeoscientific sketch maps; photographs; photomicrographs; tables; plots; phase diagrams
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
Released2021 10 27
AbstractThe Mooshla Intrusive Complex (MIC) is an Archean polyphase magmatic body located in the Doyon-Bousquet-LaRonde (DBL) mining camp of the Abitibi greenstone belt, Québec, that is spatially associated with numerous gold (Au)-rich VMS, epizonal 'intrusion-related' Au-Cu vein systems, and shear zone-hosted (orogenic?) Au deposits. To elucidate the P-T conditions of crystallization, and oxidation state of the MIC magmas, accessory minerals (zircon, rutile, titanite) have been characterized using a variety of analytical techniques (e.g., trace element thermobarometry). The resulting trace element and oxythermobarometric database for accessory minerals in the MIC represents the first examination of such parameters in an Archean magmatic complex in a world-class mineralized district.
Mineral thermobarometry yields P-T constraints on accessory mineral crystallization consistent with the expected conditions of tonalite-trondhjemite-granite (TTG) magma genesis, well above peak metamorphic conditions in the DBL camp. Together with textural observations, and mineral trace element data, the P-T estimates reassert that the studied minerals are of magmatic origin and not a product of metamorphism. Oxygen fugacity constraints indicate that while the magmas are relatively oxidizing (as indicated by the presence of magmatic epidote, titanite, and anhydrite), zircon trace element systematics indicate that the magmas were not as oxidized as arc magmas in younger (post-Archean) porphyry environments.
The data presented provides first constraints on the depth and other conditions of melt generation and crystallization of the MIC. The P-T estimates and qualitative fO2 constraints have significant implications for the overall model for formation (crystallization, emplacement) of the MIC and potentially related mineral deposits.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques, which will result in more effective targeting of buried mineral deposits. This compendium is the result of the TGI Grant Recipients 2018-2020.

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