Geology, hydrothermal alteration, and genesis of the world-class Canadian Malartic stockwork-disseminated Archean gold deposit, Abitibi, Quebec
Bibliographic record
Abstract
The Canadian Malartic Mine consists of an Archean low-grade bulk tonnage gold deposit (reserves of 10.7 Moz Au @ 0.97 g/t) hosted by clastic metasedimentary rocks of the Pontiac Group and subalkaline porphyritic quartz monzodiorite and granodiorite located immediately south of the Larder Lake-Cadillac Fault Zone. The quartz monzodiorite and granodiorite yield syn-Timiskaming U-Pb zircon ages of 2677 and 2678 Ma, respectively. Gold mineralization is characterized by zones of quartz-carbonate vein stockwork and disseminated pyrite with a Au-Te-W-S-Bi-Ag}Pb}Mo metallic signature. These ore zones are dominantly oriented subparallel to the northwest-striking S2 foliation and to the east-striking and south-dipping Sladen Fault, thus forming northwest-southeast and east-west mineralized trends. Molybdenite from highgrade ore yielded a Re-Os age of ca. 2664 Ma. In both the sedimentary rocks and the quartz monzodiorite, the proximal and distal alteration zones are characterized by the presence of calcite and ferroan dolomite, respectively. In the sedimentary rocks, the ore zones show a wide distal biotite alteration halo with proximal assemblages comprising albite and/or microcline. The quartz monzodiorite comprises a distal hematitic alteration zone that is overprinted by proximal microcline + albite + quartz replacement zones. This study suggests that at Canadian Malartic deposit, the gold mineralization and its distribution are largely controlled by D2 faults, shear and high-strain zones developed in the hinge zone of F2 folds, and by the Sladen Fault. A ?2678 Ma syn-Timiskaming magmatic-hydrothermal early phase of gold mineralization can be inferred by the metallic signature or the ore, the presence of mineralized stockworks, the potassic alteration (biotite/microcline), and association with porphyritic intrusions. The main characteristics of the Canadian Malartic deposit is thus best explained by syn-D2 deformation gold (ca. 2670-2660 Ma) superimposed onto, or remobilized from, a gold-bearing magmatic/hydrothermal system related to Timiskaming-age porphyritic intrusions emplaced along a major fertile fault zone.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".