Weathering of Quartzite on a Cryoplanation Terrace
Bibliographic record
Abstract
Sub-horizontal cryoplanation terraces are ideal laboratories to study the weathering of rock in Arctic environments. The terraces are developed in mechanically isotropic rock, are generally not greatly perturbed by gravity processes, and show blocks that have been exposed to the weathering elements for varying time. The terrace studied, herein named the Ptarmigan terrace, is 180 m in length along the slope and occurs in Precambrian chlorite-bearing green quartzite on a mountain to the north of the village of Old Crow (Yukon). The blocks of quartzite on the terrace tread record two distinct weathering events. Near the talus, the blocks show a breakdown of the chlorite and the dissolution of accessory pyrite grains. The results of this first event are the production of a white quartzite with enhanced porosity and the nearly complete leaching of iron from the rock. The second event involves the reintroduction of iron to form rusty-brown rinds that are composed principally of goethite. These rinds increase in thickness with distance from the scarp towards the slope of the mountain. The second event is developed when iron is reintroduced into the porous rocks as water-soluble compounds are drawn into the blocks by capillary forces. Occasionally, a reddish-purple front, presumably composed of hematite, is
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".