Characterization, classification, and mechanisms for mineralization of critical metal-bearing occurrences in southwestern Meguma Terrane, Canadian Appalachians
Bibliographic record
Abstract
Multiple polymetallic vein-type occurrences with a suspected but unconfirmed genetic relationship and polymetallic critical metal-bearing assemblages occur in the Meguma Terrane metasediments in southwestern Nova Scotia. A multi-analytical approach integrating results from detailed petrography, scanning electron microscopy (SEM), Re-Os geochronology of arsenopyrite, U-Pb geochronology of apatite, Al-in-chlorite thermometry via electron probe micro-analyzer (EPMA), in-situ secondary ion mass spectrometry (SIMS) of sulfur isotopes in sulfides, and fluid inclusion systematics has allowed for the \ncharacterization and interpretation of mineralization at the Lansdowne (Sb-Pb-Zn-Co-Ag) and Cape St. Mary’s (Sb-Pb-As-Co-Ni-Bi-Au-REE) occurrences, and comparisons with the Nictaux Falls Dam occurrence (Co-Ni-As-Bi-Au). These results suggest a complex multi-stage mineralizing history for both occurrences due to reactivation of Neoacadian structures. Critical metal mineralization of the Lansdowne occurrence represents a newly classified occurrence type in Nova Scotia related to extensional tectonics from the breakup of Pangea in the Late-Triassic.
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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 | 0.004 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".