Origin of organic matter in the Proterozoic Athabasca Basin of Saskatchewan and Alberta, and significance to unconformity uranium deposits
Bibliographic record
Abstract
Pyrobitumen associated with uranium ores of Athabasca Basin unconformity-type deposits has been proposed to form during mineralization by hydrothermal alteration of basement graphite. Textural studies indicate that basement graphite was physically altered by mineralizing fluids, but was not involved in pyrobitumen formation. As pyrobitumen (and its parent petroleum) includes and crosscuts ore, it postdated mineralization and had no role in the initiation and localization of unconformity uranium deposits. Petrographic and geochemical data indicate that the Mesoproterozoic Douglas Formation black shale generated petroleum in the past and sourced the pyrobitumen associated with the deposits. The older episode of petroleum generation and migration was overprinted by crude oils related to Athabasca tar sands (during Late Cretaceous to early Tertiary) that descended into the Athabasca Group and basement rocks, and subsequently degraded to solid to tarry bitumens in a manner analogous to the proposed earlier migration of petroleum from the Douglas Formation.
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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 | 0.003 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 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".