| Title | Lithological and structural controls on the nature and distribution of gold at the LaRonde Zone 5 project, Doyon-Bousquet-LaRonde gold camp, Abitibi, Quebec |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Boily-Auclair, E; Mercier-Langevin, P; Ross, P -S; Pitre, D |
| Source | Targeted 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 |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative: 2018 report of activities |
| File format | pdf |
| Province | Quebec |
| NTS | 32D/01; 32D/02; 32D/07; 32D/08 |
| Area | Abitibi |
| Lat/Long WENS | -78.6000 -78.4000 48.3000 48.2167 |
| Subjects | economic 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 |
| Illustrations | location maps; geoscientific sketch maps; stratigraphic sections; photographs; plots; geochemical profiles |
| Program | Targeted Geoscience Initiative (TGI-5) Knowledge Management Coordination |
| Program | Targeted Geoscience Initiative (TGI-5) Gold ore systems - System Controls - Time and Space |
| Released | 2019 03 01 |
| Abstract | The 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. |
| GEOSCAN ID | 313631 |
|
|