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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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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
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, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
File formatpdf
NTS32D/01; 32D/02; 32D/07; 32D/08
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; Precambrian
Illustrationslocation maps; geoscientific sketch maps; stratigraphic sections; photographs; plots; geochemical profiles
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Gold ore systems - System Controls - Time and Space
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.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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