The St. Eugene Deposit, British Columbia: A Metamorphosed Ag-Pb-Zn Vein in Proterozoic Belt-Purcell Rocks
Bibliographic record
Abstract
The St. Eugene deposit is an Ag-Pb-Zn vein deposit hosted by clastic sedimentary rocks of the Purcell Supergroup, which were metamorphosed during the East Kootenay orogeny. Hydrothermal metasomatism created an alteration zone surrounding the veins that we subdivide into four facies separated by gradational contacts: garnet-chlorite, internal, intermediate, and external. Chemical and isotopic exchanges between wall rocks and hydrothermal fluid created a chemical reaction zone that is characterized by gains in FeO, MnO, Pb, Zn, and Sb and by losses in CaO, Na 2 O, K 2 O, Sr, Rb, and Cs. Wall-rock δ 18 O values decrease from the vein selvage outward because of water-rock exchange with a metamorphic fluid with a high δ 18 O value. Sulfur in vein sulfides is derived from local wall rock. Mn-rich garnet formed near the quartz sulfide vein during metamorphism because the stability temperature of garnet is lowered in rocks hydrothermally enriched in Mn. The occurrence of manganiferous garnet in Belt-Purcell rocks should be regarded as a metallotect for syngenetic and epigenetic mineralization in those rocks.
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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 | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".