Petrography, geochemistry, and petrogenesis of Li-enriched and Li-poor aplite–pegmatites in the Preissac–Lacorne area, Abitibi subprovince, Canada
Bibliographic record
Abstract
The Preissac–Lacorne area, within the Archean Abitibi granite–greenstone belt, hosts numerous Li-enriched and Li-poor aplite–pegmatites. Both suites are strongly peraluminous, calc-alkaline, late- to post-tectonic composite intrusions cutting through the monzogranite–granodiorite suite and associated volcano-sedimentary sequences along the Manneville Fault System (MFS). The Li-enriched aplite–pegmatites, products of at least two distinct mineralizing events, are more highly differentiated (K/Rb = 18) than their Li-poor counterparts (K/Rb = 26) and contain three generations of spodumene formed through magmatic to magmatic–hydrothermal processes. Both suites likely represent multiple generations of aplite–pegmatites, including those derived from the S-type Lamotte monzogranite and those formed by shear zone-controlled anatexis along the MFS. Field observations indicate that shear-related partial melting of metasedimentary and granodioritic rocks generated Li-poor aplite–pegmatites, whereas partial melting of the monzogranite under similar conditions produced Li-enriched varieties. Overall, both suites appear genetically linked to episodic activation of the MFS prior to and during the waning stages of regional deformation.
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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 | 0.002 |
| 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) | 0.001 | 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 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".