Textural and mineralogical characterization of a Ni-Zn-rich black shale occurrence at the Akie property, Kechika Trough, northern British Columbia, and comparison with examples from Yukon
Bibliographic record
Abstract
Hyper-enriched black shales (HEBS) that are enriched in Ni, Zn, Mo, and other elements occur within the Devonian strata of Yukon over 100s to 1000s km2. The mineralization is typically up to several tens of centimetres thick. Recently, during exploration for SEDEX deposits, mineralization that is potentially analogous (and time-stratigraphically equivalent) to HEBS mineralization in Yukon was discovered in the Kechika Trough of northeastern British Columbia. Here, about 3 to 20 m stratigraphically below the SEDEX mineralization of the Cardiac Creek deposit, an approximately 2 to 20 cm thick stratiform horizon hosts sphalerite, chalcopyrite, millerite, gersdorffite, clausthalite, pentlandite and pyrite within Devonian black, carbonaceous shale. This mineralization is strikingly similar in broad stratigraphic age, metal enrichments, textures and mineralogy to HEBS localities in Yukon. Based on these similarities, this mineralization likely was formed at a discrete time interval, over a wide area (likely 1000s km2) within the Selwyn Basin and the adjacent carbonate platform. This has implications for any genetic and exploration model(s) for this style of mineralization.
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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 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".