Mercury-bearing manganiferous veinlets in compact haematite ore: the preliminary data from Fábrica deposit, Quadrilátero Ferrífero, Minas Gerais, Brazil
Bibliographic record
Abstract
Manganese oxide veinlets occur in high grade compact haematite ore at Fábrica in the Quadrilátero Ferrífero of Minas Gerais in Brazil. The veinlets are microbreccias of cryptomelane and minor mechanically twinned haematite, with void-infilling lithiophorite. Bulk-rock geochemistry of selected samples shows that the increased Mn content is accompanied by enrichment in Hg (to 8 ppm), as compared with Mn-free compact haematite. This Mn–Hg mineralisation within the compact haematite has hitherto not been recognised in the Quadrilátero Ferrífero and may exist in other haematite ores containing Mn. The microbrecciation is tentatively attributed to late- or post-Brasiliano tectonics and seismic activity.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".