Architecture de la ceinture métasédimentaire centrale au Québec, Province de Grenville : un exemple de l'analyse de terrains de métamorphisme élevé
Bibliographic record
Abstract
This bulletin describes the architecture and Grenvillian and pre-Grenvillian tectono-magmatic evolution of the Central Metasedimentary Belt in Quebec (Grenville Province). It provides detailed information on a variety of Mesoproterozoic geological and metallogenic contexts and evolutionary processes including hydrothermal alteration, magma emplacement, metamorphism, and deformation. The study area comprises two main metasedimentary domains dominated respectively by marble and quartzite. These overlie a series of granulite-facies gneiss complexes, including the 1.4 Ga volcanoplutonic Bondy gneiss complex, an island-arc component built on a thin Laurentian margin The complex hosts a metamorphosed cupriferous hydrothermal system. The components of the Central Metasedimentary Belt were metamorphosed at 1.2 Ga. The vertically layered mafic intrusions and the mafic to felsic sheets of the Chevreuil intrusive suite (1.17-1.16 Ga) intrude the gneiss units. These intrusions contain local nickel-copper mineralization and were emplaced within deformation zones that are interpreted to be faults that acted as magma conduits during reactivation of deformation following peak metamorphism. The Kensington-Skootamatta potassic alkaline suite (1.09-1.07 Ga) consists of ultramafic to felsic nested plutons and lamprophyres that record magma ascent by fracture propagation along dykes and entrapment by marble to form plutons. In the Rivard dyke, repeated delamination of wall rock during magma ascent resulted in the incorporation of xenoliths that reveal the nature and composition of the lithosphere at 1.07 Ga. The integration of xenolith, surface geology, and seismic data provides 4D mapping elements that are used to propose an evolutionary model of the Central Metasedimentary Belt in Quebec.
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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 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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".