Rhenium-rich molybdenite and Re-Os age of the Archean porphyry-style Don Rouyn deposit, Abitibi greenstone belt, Rouyn-Noranda, Québec
Bibliographic record
Abstract
This report presents Re-Os dating of molybdenite from the Don Rouyn deposit and St. Jude breccia prospect in the Rouyn-Noranda mining district in the southern Abitibi greenstone belt, Quebec. Both have been described as porphyry-style, magmatic-hydrothermal Cu-(Au-Mo) deposits associated with the Flavrian and Powell subvolcanic plutons based on the nature of the mineralized zones, their setting and available U-Pb age constraints. To further constrain the timing of mineralization, molybdenite was sampled at both sites for Re-Os geochronology. Although the analyzed sample from the St. Jude prospect did not yield a realistic age, a molybdenite mineral separate sample from the Don Rouyn deposit yielded a reliable age of 2689 ± 11 Ma. Interestingly, the Don Rouyn molybdenite is distinguished by extremely high Re content (>5200 ppm Re) that compares with that of the world's richest porphyry deposits. Based on the Re-Os age obtained in this study and limited descriptions of the deposit available in the literature, the Don Rouyn deposit is most likely associated with the emplacement of the Flavrian-Powell intrusive complex at ~2700 Ma, as suggested in previous studies. However, a younger timing of emplacement, comparable to other ca. 2682-2680 sub-alkaline to alkaline magmatic-hydrothermal Cu-(Au-Mo) deposits in the southern part of Blake River Group, although less likely, cannot be entirely ruled out based on the available constraints and the molybdenite Re- Os age presented here.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 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) | 0.002 | 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".