Stratabound Zinc Mineralization at the Salerno Lake and Calumet-Sud Occurrences hosted in the Proterozoic Central Metasedimentary Belt Marbles of the Grenville Province, Canada
Bibliographic record
Abstract
High-grade marbles of the southeastern Central Metasedimentary Belt in the Grenville Province host several stratabound zinc deposits and occurrences, interpreted in previous work to have been formed from exhalative brines during carbonate sedimentation (SEDEX-type). However, the results from detailed mapping, paragenesis, mineral chemistry, and lithogeochemistry at the Salerno Lake (Ontario) and Calumet-Sud (Quebec) occurrences revealed that syenite, carbonatite, and felsic intrusions occur proximal and may have contributed to the zinc mineralization. At the Salerno Lake occurrence, yellow (Fe- and Mn-poor), intrusion-proximal sphalerite is associated with apatite displaying elevated concentrations of F, Na2O, and SO3, similar to apatite in the intrusive rocks. Moreover, both the proximal hydrothermally altered marble and meta-syenite contain elevated K2O, Al2O, TiO2, Ba, Sr, Rb, Ce and Nd. Red sphalerite (Fe- and Cd-rich) occurs as overgrowths on yellow sphalerite in the proximal zones and extends along bands in the distal zones and is associated with apatite and graphite. Calumet-Sud shares similar mineralogical relationships. I propose that the marble-hosted zinc mineralization is epigenetic and had input of fluids that exsolved from or interacted with the alkaline magmatic rocks particularly in the proximal zones. The stratabound controls on sphalerite mineralization is interpreted to be due to the interaction of magmatic and possible basinal mineralizing fluids with favorable reduced-carbonate layers rich in organic matter and phosphate. Amphibolite-facies metamorphism and deformation have caused changes in the textures of the ore, but the compositional signature of the mineralized zones is interpreted to represent that of the original hydrothermal system.
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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 | 0.001 |
| 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) | 0.001 | 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".