The geochemistry and physical volcanology of the East Lake ultramafic zone, Cape Smith belt, northern Québec /
Bibliographic record
Abstract
The East Lake Zone is located within the Raglan horizon of the Cape Smith Foldbelt and hosts an ultramafic dyke/sill complex. The ultramafic units intrude both Raglan horizon siltstone as well as volcanic and volcaniclastic rocks of the Povungnituk Group. Magnesium, silica and chromium variation along with analyses of fresh olivine grains from the East Lake Zone indicate the ultramafic rocks were formed by olivine and chromite accumulation in a magma containing 11--13 wt % MgO. Rare Earth Element profiles of intrusive margins and some Chukotat Group pyroxene-phyric basalts show Light Rare Earth Element enrichment consistent with contamination by Raglan siltstone, however the enrichment occurs stratigraphically below the siltstone, reducing the likelihood of contamination having occurred locally. Sulphur concentrations and olivine nickel contents indicate that minor amounts of sulphide liquid (<0.5%) were present during emplacement. Previous studies have proposed a model for Raglan ultramafic unit contamination and sulphide saturation by thermal erosion of sulphidic sediments by flowing lava. The current study excludes thermal erosion by flowing lava as a mode of contamination and sulphide production as the East Lake Zone units are intrusive, and already have been contaminated and carry a sulphide phase.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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".