Timing of synvolcanic magmatism in relation to base-metal mineraliztion, Rouyn-Noranda, Abitibi volcanic belt, Quebec; Radiogenic Age and Isotopic Studies: Report 15
Bibliographic record
Abstract
Uranium-lead zircon dating was carried out on the 2700 Ma Flavrian-Powell subvolcanic intrusive complex in the Noranda cauldron-hosted volcanogenic massive sulphide camp in order to determine the temporal relationship between intrusion-hosted Cu-Mo and volcanic-hosted massive-sulphide mineralization. The youngest trondhjemite phase of the Flavrian-Powell subvolcanic intrusivecomplex has an age of 2700 +3/-2 Ma, whereas a quartz porphyritic aplite dyke that crosses the Cu-Mo-Au-mineralized St. Jude intrusive breccia pipe returned an age of 2697 " 2 Ma, similar to the post-cauldron Cléricy rhyolite. In conjunction with published dates on the Flavrian-Powell subvolcanicintrusive complex, these ages restrict the main emplacement events of the intrusive complex to less than 2 million years, and disassociate the volcanogenic massive sulphide mineralization related to the 2700 Mamagmatic event from the 2697 Ma late porphyry-type mineralization. The latter date coincides with the age of late Blake River Group volcanism and magmatism that hosts the Bousquet camp Au-(Cu) vein and auriferous volcanogenic massive sulphide deposits.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| 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".