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TitleRegional and local controls on mineralization and pluton emplacement in the Bondy gneiss complex, Grenville Province, Canada interpreted from aeromagnetic and gravity data
AuthorDufréchou, G; Harris, L B; Corriveau, L; Antonoff, V
SourceJournal of Applied Geophysics 2015 p. 192-205,
Alt SeriesEarth Sciences Sector, Contribution Series 20140292
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
NTS31G/02; 31G/03; 31G/04; 31G/05; 31G/06; 31G/07; 31G/10; 31G/11; 31G/12; 31G/13; 31G/14; 31G/15; 31J/02; 31J/03; 31J/04; 31J/05; 31J/06; 31J/07; 31J/10; 31J/11; 31J/12; 31J/13; 31J/14; 31J/15; 310/02; 310/03; 310/04; 310/05; 310/06; 310/07; 310/10; 310/11; 310/12
AreaGrenville Province
Lat/Long WENS -76.0000 -74.5000 47.7500 45.0000
Subjectseconomic geology; geophysics; igneous and metamorphic petrology; metallic minerals; structural geology; iron; copper; hydrothermal deposits; plutons; metamorphism, regional; metamorphism; shear zones; shear fractures; fluid migration; gravity anomalies; gravity surveys, airborne; gravity surveys; magnetic surveys; magnetic surveys, airborne; mineral exploration; faults, strike-slip; mineral deposits; epithermal deposits; Bondy Gneiss Complex
Illustrationslocation maps; gravity maps; geologic maps; structural maps; magnetic anomaly maps; magnetic maps; gravity profiles; graphs; tables; photographs
ProgramTargeted Geoscience Initiative (TGI-4), Uranium Ore Systems
Released2015 03 14
AbstractThe Bondy gneiss complex in the Grenville Province of SW Quebec hosts a mineralized iron oxide- and copper-rich hydrothermal system. The northern part of the complex overlies the lithospheric Mont-Laurier lineament and is cut by the regional Mont-Laurier S shear zones interpreted from Bouguer gravity. Geophysical data, including a new high resolution airborne magnetic survey, and field observations identified a sinistral 6 km wide strike-slip corridor defined by several second-order shears that corresponds to the regional Mont-Laurier S shear zone in the complex. The spatial association of a metamorphosed alteration system, several pre- to post-metamorphic mineralized zones and mafic intrusions within the Mont-Laurier S shear zone suggests that (i) underlying basement structures controlled the hydrothermal fluid migration during the formation of the epithermal-IOCG mineralization and alteration system before ca. 1.2 Ga high-grade metamorphism and penetrative ductile deformation in the complex; (ii) post-metamorphic reactivation allowed magma ascent and emplacement in the complex and in adjacent supracrustal rocks within dilatational sites; and (iii) provided channel way for fluid migration associated with magnetite mineralization in brittle-ductile shears that postdate high-grade metamorphism.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This paper model geophysical data acquired by private sector and processed by a PhD student at INRS in collaboration with the GEM1 IOCG-Great Bear region project and the TGI-4 Uranium project. The modelling identifies deeply-buried geophysical discontinuities interpreted as having channelled magmas and fluids hence metals and heat through the continental crust to form multiple-metal mineralisation that bears attribute of iron oxide copper-gold (IOCG) deposits. The case study is a high-grade metamorphic terrain of the Canadian Shield in south-west Québec. Since then, this geologically complex area is used to test geological hypotheses that could lead to refined geological and geophysical guides for exploring IOCG and affiliated mineral deposits in the Canadian Shield.