| Title | Stratigraphic setting of the LZ5 and Ellison mineralized zones, LaRonde Zone 5 project, Doyon-Bousquet-LaRonde mining camp, Abitibi, Quebec |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Boily-Auclair, É; Mercier-Langevin, P; Ross, P -S; Pitre, D |
| Source | Targeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems; by Mercier-Langevin, P (ed.); Lawley, C J M (ed.); Castonguay, S (ed.); Geological Survey of Canada, Open File 8712, 2020 p. 57-73, https://doi.org/10.4095/323665  Open Access |
| Image |  |
| Year | 2020 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative 5: contributions to the understanding of Canadian gold systems |
| 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; stratigraphy; structural geology; tectonics; geochronology; geochemistry; Nature and Environment; Science and Technology; mineral deposits; gold; copper; zinc; silver; mineral
exploration; ore mineral genesis; mineralization; ore controls; metallogeny; models; host rocks; stratigraphic analyses; stratigraphic correlations; bedrock geology; lithology; igneous rocks; volcanic rocks; volcaniclastics; tuffs; dacites;
rhyodacites; rhyolites; andesites; basalts; intrusive rocks; diabases; structural features; faults; fault zones; joints; veinlets; veins; quartz veins; sulphides; pyrite; pyrrhotite; chalcopyrite; lenses; alteration; tectonic setting; tectonic
evolution; deformation; metamorphism; schistosity; magmatism; volcanism; intrusions; sills; dykes; domes; hydrothermal systems; petrogenesis; radiometric dating; uranium lead dating; geochemical analyses; Archean; Doyon-Bousquet-LaRonde Mining Camp;
LaRonde Zone 5 Project; Bousquet 1 Mine; Ellison Property; Bousquet Property; Westwood Property; Abitibi Greenstone Belt; Blake River Group; Bousquet Formation; Hébécourt Formation; Ellison Zone A; Larder Lake-cadillac Fault Zone; Lac Parfouru Fault;
Lac Imau Fault; Precambrian |
| Illustrations | location maps; geoscientific sketch maps; correlation sections; photographs; geochemical plots; lithologic sections; geochemical profiles |
| Program | Targeted Geoscience Initiative (TGI-5) Gold ore systems |
| Released | 2020 06 11; 2023 03 17 |
| Abstract | The LaRonde Zone 5 (LZ5) project and the neighbouring mineralized zones of the Ellison property are part of the Doyon-Bousquet-LaRonde mining camp in the southern part of the Abitibi greenstone belt.
The mineralized zones of the LZ5 (zones 4, 4.1, and 5) and the Ellison property (zones A and B) are hosted in the Bousquet Formation of the Blake River Group. The host rocks are steeply south-dipping (80-90°) and south-facing, mafic to felsic
volcanic and volcaniclastic units. The synvolcanic gold mineralization consists of deformed discordant networks of millimetre to centimetre thick pyrite±pyrrhotite±chalcopyrite veinlets (10-20 vol.%) and, to a lesser extent, very finely disseminated
pyrite (1 vol.%) in altered volcanic and volcaniclastic rocks. Prior to this study, the LZ5 and Ellison mineralized zones were interpreted to be hosted in the Bousquet heterogeneous unit (Unit 4.4) in the uppermost part of the lower member of the
Bousquet Formation. The current study shows that the mineralized zones are located higher in the stratigraphic sequence, i.e., in highly deformed and altered mafic to felsic volcanic and volcaniclastic units (tuff and lapilli tuff) at the base of the
upper member of the Bousquet Formation. Consequently, the LZ5 mineralization, which is considered one of the oldest in the camp, coincides in time and space with a shift in the magmatic evolution of the Bousquet Formation from dominantly
tholeiitic-transitional mafic-intermediate (lower member) to dominantly transitional-calc-alkaline intermediate-felsic (upper member). The revised position of the LZ5 ore zones to slightly higher in the stratigraphic sequence substantiates the
camp-wide association between Au (±Cu-Zn-Ag) mineralization and intermediate to felsic transitional to calc-alkaline magmatism and further indicates that hydrothermal and petrogenetic processes are linked in major synvolcanic Au deposits in the
Archean. |
| Summary | (Plain Language Summary, not published)
The main objective of phase 5 (2015-2020) of Natural Resources Canada and Geological Survey of Canada's Targeted Geoscientific Initiative (TGI) program
was to generate new knowledge, methodologies and models to enhance the exploration industry's ability to detect buried ore deposits. This synthesis volume contains 20 individual papers that discuss craton to deposit-scale characteristics of
auriferous deposits, plus some support material pertaining to the TGI-5 Gold project. |
| GEOSCAN ID | 323665 |
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