Sedimentary pyrite as a gold-source in sediment-hosted gold occurrences in the Selwyn basin area, eastern Yukon
Bibliographic record
Abstract
Intrabasinal sedimentary pyrite has recently been proposed as a potential gold source for sediment-hostedgold deposits. To evaluate this concept in the Selwyn basin area of eastern Yukon, we uselaser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) to analyse pyrite fromthe Carlin-type Conrad, and orogenic gold 3Ace occurrences. This paper texturally and chemicallycharacterizes four generations of pyrite in grey to black mudstones and siltstones, but focuses 83%of the analyses on early and late diagenetic pyrite. Diagenetic pyrite from the Conrad occurrence istrace element poor with respect to deposit-proximal pyrite from shales in the Northern Carlin Trendof Nevada, but is similar in composition to distal diagenetic pyrite in these Nevada shales. Diageneticpyrite from the 3Ace occurrence is very similar in composition to pyrite around the giant SukhoiLog deposit in eastern Russia. It can be preliminarily concluded that the trace element compositionof diagenetic pyrite from the Conrad and 3Ace occurrences is permissive of a locally derivedintrabasinal sedimentary pyrite gold source.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".