Field Relationships, Mineralogy, and Geochemistry of the L'Enfer Norite and Possible Relationships with Massif Anorthosites, Grenville Province, Quebec
Bibliographic record
Abstract
A unique, coarse-grained, unaltered norite pluton crops out in the Grenville Province of Quebec, Canada, just north of the Lac a Jack massif anorthosite. The weathered surface appears off-white with large gray phenocrysts of plagioclase surrounded by dark mafic minerals, resembling a sub-ophitic texture. The pluton is divided into a northern and southern area by a strip of country rock, but the two sections are homogeneous. The pluton is not obviously differentiated, but a more medium grained variety is located in proximity with the contact between the pluton and the country rock. Several jotunite dikes intrude the L’Enfer norite. The medium grained contact rocks and the coarse-grained rocks have similar major and trace element compositions, suggesting that both are close representations of the melt composition. Whole-rock normative An values for the norite show a correlation with spatially associated massif anorthosites, especially the St. Urbain and Lac a Jack anorthosites. High TiO. levels are also correlative with ilmenite ores found associated with massif anorthosites. However, the anorthosites are lacking in olivine and magnetite, which are present in the norite. These comparisons suggest that the L’Enfer norite is related spatially, mineralogically, and chemically with the Grenvillian aged massif anorthosites, but does not represent a parental magma for the anorthosites.
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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 | 0.001 |
| 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) | 0.004 | 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".