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TitleThe geology, petrology, and geochronology of the Archean Côté gold large-tonnage, low-grade intrusion-related Au(-Cu) deposit, Swayze Greenstone Belt, Ontario, Canada
AuthorKatz, L R; Kontak, D J; Dubé, B; McNicoll, V
SourceCanadian Journal of Earth Sciences vol. 54, 2, 2017 p. 173-202, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20182385
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
Subjectseconomic geology; mineral deposits; gold
ProgramTargeted Geoscience Initiative (TGI-5) Gold ore systems
Released2017 01 11
AbstractThe Archean Côté Gold Au(-Cu) deposit is the first large gold deposit discovered in the Swayze greenstone belt of the Abitibi Subprovince. The deposit is a low-grade, large-tonnage type with a combined indicated and inferred resource of 8.65 M oz Au (245.2 t Au). The deposit is hosted by the Chester intrusive complex (CIC), a multiphase, subvolcanic intrusion composed of low-Al tonalite, diorite, and quartz diorite, plus magmatic and hydrothermal breccia bodies. The age of the tonalite and dioritic phases is constrained at 2741-2739 ± 1 Ma using high-precision isotope dilution - thermal ionization mass spectrometry (ID-TIMS) U-Pb zircon geochronology. Although these phases are co-temporal and co-spatial, they appear to be petrogenetically unrelated . The CIC was emplaced into mafic metavolcanic rocks of the Arbutus Formation whose geochemistry reflects a back-arc environment. The tonalite of the CIC is coeval and co-genetic with the felsic to intermediate metavolcanic rocks of the Yeo Formation. Emplacement of the CIC into a shallow crustal level is inferred based on the incorporation of screens and inclusions of the Yeo Formation and is supported by the presence of textures in tonalite and dioritic rocks (e.g., granophyres, miarolitic cavities, and pegmatites), as well as Al-in-hornblende geobarometry results of less than or equal to 1.3 ± 0.6 kbars (1 kbar = 100 MPa). The CIC is petrologically similar to other subvolcanic, low-Al tonalite-trondhjemite-diorite intrusions that underlie volcanogenic massive sulphide (VMS)-type deposits and which themselves may contain syn-intrusion mineralization. Several geochemically unrelated dykes and deformation events crosscut and postdate the CIC.

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