HIGH-Cr MINERALS FROM THE MATOUSH URANIUM DEPOSIT IN THE OTISH BASIN, QUEBEC, CANADA
Bibliographic record
Abstract
A high-Cr mineral assemblage is observed in the unusual Matoush uranium deposit (Quebec, Canada), which is associated with the bimodal Matoush dike intruding Otish Basin sandstones. In addition to uraninite, both silicate (chromium-dravite and chromphyllite) and oxide (eskolaite) high-Cr minerals are present in major amounts. While high-Cr dravite and high-Cr muscovite have been described previously, eskolaite, Cr2O3, has not been studied extensively. The highest Cr contents observed in the Matoush silicates, obtained by electron microprobe, are comparable with the highest ever documented in the literature, with Cr2O3 of up to ca . 22 wt.% in chromphyllite and ca . 37 wt.% in chromium-dravite. Complete solid solutions among hematite (Fe2O3), eskolaite, and karelianite (V2O3) are theoretically possible, but until now only complete Cr-V substitution had been documented in natural samples. Matoush eskolaite contains significant amounts of Fe, with up to 37% wt.% Fe2O3 substitution, and minimal V substitution (typically under 0.5 wt.% V2O3). A hydrated Fe-Cr oxide is also observed closely associated with eskolaite at Matoush, having the same Cr:Fe:V ratio as eskolaite, but with significant assumed H2O. Rietveld analysis of X-ray powder diffraction data is best fit using a model that includes eskolaite and a second hydrated crystalline Fe-Cr oxide with a similar atomic structure to eskolaite, but a significantly larger c-axis dimension.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 teacher head, 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".