Anomalous Cr-Rich Zones In Sector-Zoned Clinopyroxene Macrocrysts In Gabbro, Mont Royal, Montreal, Quebec, Canada
Bibliographic record
Abstract
We document unusual zones of Cr enrichment (up to 0.9 wt.% Cr 2 O 3 ) in sector-zoned clinopyroxene crystals from gabbro sampled near the outer contact of the Mont Royal intrusive complex, of Early Cretaceous age, located in the city of Montreal. Mont Royal is one of the Monteregian Hills, but by no means the best-known mineralogically. We describe the compositional variation in macrocrysts of Ti-rich clinopyroxene by means of element-distribution maps and a detailed 0.37 mm traverse across the contact between a relatively homogeneous core and a mantle showing sector and oscillatory zoning. A Cr- and Mg-enriched zone appears in that interval and is also recorded in the coeval ferri-kaersutite. Both elements, being highly compatible, are not expected to build up in a boundary layer. After a period of slow growth in a hotter part of the reservoir, the macrocrysts seem to have migrated near the outer contact, where more rapid loss of heat and degassing contributed to the development of sector and oscillatory zoning. Such zoning was accompanied by an overall rise in f (O 2 ). The anomalous Cr-Mg-enriched zones seem more likely attributable to local cooling and oxidation of the magma than to an episode of replenishment in the magma reservoir.
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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 | 0.001 |
| 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".