The Genesis of PGE Mineralization in the River Valley Intrusion, Ontario, Canada
Bibliographic record
Abstract
The 2.48 Ga, mafic, River Valley Intrusion hosts contact-style Cu-platinum group element (PGE) mineralization. Magmatic sulphides comprise pyrrhotite + chalcopyrite + pentlandite whereas hydrothermal sulphides comprise chalcopyrite + pyrite + marcasite. The latter are more widespread, forming a halo up to 150 m from the mineralized zone, and are intimately associated with replacement assemblages comprising 1) amphibole + chlorite + epidote + biotite + quartz + carbonate + sodic plagioclase, and 2) K-feldspar + chlorite + quartz + amphibole + muscovite + sodic plagioclase. Platinum group minerals (PGM) in magmatic sulphides are mostly moncheite and kotulskite. Most PGM, however, occur with hydrothermal silicates and sulphides and are dominated by kotulskite, isomertieite, sperrylite, and un-named Pd- and Pt-alloys. Fluid-rock interaction has caused widespread redistribution of base metals, sulphur and PGE. A lithogeochemical hydrothermal dispersion halo, best defined by Cu, extends well into the hanging wall of the mineralized 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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 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".