Geology and lithogeochemistry of the Powderhorn Lake VMS \ndeposit, Newfoundland
Bibliographic record
Abstract
The Powderhorn Lake volcanogenic massive sulfide (VMS) deposit is hosted within the \nOrdovician Buchans-Roberts Arm (volcanic) belt (BRAB) in central Newfoundland. The \ndeposit is hosted by coherent and clastic rhyolitic rocks that are interpreted to have formed \nwithin a rifted continental arc setting. The stratigraphy, alteration, and mineralization of the \ndeposit is preserved within multiple, imbricated thrust panels that comprise a regional domal \nantiform. Mineralization occurs as multiple stacked lenses consisting of stringer to semimassive \nand massive pyrrhotite, sphalerite, chalcopyrite, pyrite, and minor galena. Sulfide \nlenses typically contain relicts of host rocks and are interpreted to have formed by \nreplacement-style processes at or below the seafloor. Hydrothermal alteration assemblages at \nPowderhorn Lake consist of weak to intense quartz-sericite and quartz-sericite-chlorite+/- \npyrite. Lithogeochemical data, mass change calculations, and short-wave infrared spectroscopy \nidentified key element associations and alteration assemblages that provide vectors towards \nmineralization. The lithogeochemical data have been used to create a 3D alteration model of \nthe Powderhorn Lake deposit that highlights spatial relationships between key alteration \ncharacteristics and stratigraphy.
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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 | 0.001 | 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) | 0.003 | 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".