Volcanic, structural, and hydrothermal controls on coincident Archean Low and High Sulfidation VMS Systems within the Onaman Assemblage, Onaman-Tashota Greenstone Belt, Northern Ontario, Canada
Bibliographic record
Abstract
High sulfidation volcanogenic massive sulfide (VMS) deposits show characteristics of VMS and \nhigh sulfidation epithermal deposits and are suggested to have formed through magmatic fluid \ncontribution to an evolved seawater hydrothermal system. Two superimposed systems within the \nNeoarchean Onaman assemblage in Northwestern Ontario present an opportunity to assess the \nassociation between high sulfidation and traditional “low sulfidation” VMS systems. The \nstratigraphy of the Onaman assemblage consists of pillowed mafic volcanic flows, volcaniclastic \nrocks, and felsic flows and domes. The assemblage hosts a metamorphosed alteration system \ndefined by kyanite and chloritoid-bearing mineral associations that overprint more traditional VMS \nassociations of calcite, chlorite, and sericite. The sequence is consistent with subaqueous volcanism \nfollowed by uplift and erosion, which subsequently subsides to marine conditions. We postulate \nthat the reactivation of synvolcanic structures, during uplift and subsidence, allowed for a direct \nmagmatic volatile input into an evolved seawater dominated, VMS 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 | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 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) | 0.001 | 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".