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TitleLithological and structural controls on the nature and distribution of gold at the LaRonde Zone 5 project, Doyon-Bousquet-LaRonde gold camp, Abitibi, Quebec
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AuthorBoily-Auclair, E; Mercier-Langevin, P; Ross, P -S; Pitre, D
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 23-32, https://doi.org/10.4095/313631 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
ProvinceQuebec
NTS32D/01; 32D/02; 32D/07; 32D/08
AreaAbitibi
Lat/Long WENS -78.6000 -78.4000 48.3000 48.2167
Subjectseconomic geology; structural geology; tectonics; geochronology; geochemistry; mineral deposits; gold; mineral exploration; ore mineral genesis; mineralization; ore controls; structural controls; bedrock geology; lithology; igneous rocks; volcanic rocks; volcaniclastics; tuffs; dacites; rhyodacites; rhyolites; andesites; basalts; intrusive rocks; diabases; structural features; faults; fault zones; joints; veinlets; pyrite; chalcopyrite; alteration; chloritization; carbonatization; sericitization; tectonic setting; deformation; metamorphism; foliation; schistosity; volcanism; intrusions; sills; dykes; strain; shearing; radiometric dating; uranium lead dating; veins; Archean; Doyon-Bousquet-LaRonde Mining Camp; LaRonde Zone 5; Blake River Group; Abitibi Greenstone Belt; Bousquet Formation; Superior Province; Larder Lake-cadillac Fault Zone; Lac Parfouru Fault; Lac Imau Fault; Doyon Fault; Bousquet Fault; Bousquet Property; LaRonde Property; ore systems approach; Precambrian
Illustrationslocation maps; geoscientific sketch maps; stratigraphic sections; photographs; plots; geochemical profiles
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramGold ore systems - System Controls - Time and Space, Targeted Geoscience Initiative (TGI-5)
Released2019 03 01
AbstractThe LaRonde Zone 5 (LZ5) is in the Doyon-Bousquet-LaRonde mining camp (DBL), eastern Blake River Group, Abitibi greenstone belt. LaRonde Zone 5 and the satellite zones 4 and 4.1 are hosted within steeply south-dipping (80-90°) and south-facing volcanic and volcaniclastic units (mafic to felsic tuff and lapilli tuff) of the lower member of the Bousquet Formation. The mineralization of all three zones consists of discordant networks of millimetre to centimetre thick pyrite±chalcopyrite veinlets (10-20 volume %) and, to a lesser extent, of very finely disseminated pyrite (1 volume %) in chlorite-carbonate-sericite alteration zones. Gold is present as microscopic inclusions in fine-grained granoblastic pyrite in both the veinlets and disseminations.
The study area was affected by major tectonic deformation and the mineralized zones were intensely transposed into the steeply dipping, east-trending penetrative foliation. Uncertainty remains about the exact timing of gold mineralization, deformation, and metamorphism. Also, the style of mineralization at LZ5 (pyrite±chalcopyrite veins and vein-lets, ± disseminated pyrite) and its setting (mafic-intermediate rocks of the lower member of the Bousquet Formation) largely differs from most of the ore in the rest of the DBL, which is considered to be synvolcanic. Ongoing research at LZ5 aims to document the ore styles and setting, establish the relative timing of events, compare mineralization with the other ore styles of the camp and contribute to the metallogenic models for Archean gold deposits in the southern Superior Province.
GEOSCAN ID313631