Geology and lithogeochemistry of the cirque stratiform sediment-hosted Ba-Zn-Pb-Ag deposit Northeastern British Columbia
Bibliographic record
Abstract
The Cirque deposit is one of several Devono-Mississippian stratiform sediment-hosted Ba-Pb-Zn-Ag deposits in the Akie Zn-Pb district of northeastern British Columbia. It has drill indicated reserves of 32.2 million tonnes grading 7.9% Zn, 2.1% Pb, and 47.7 g/tonne Ag. The "ore" zone is a syngenetic exhalite deposit. Its deposition, however, was but one of many wide-ranging "ore"-related events that dominated sedimentation in the shale basin. These "ore"-related events include exhalative activity, influxes of turbidites and increased organic productivity. Many details of the "ore"-related events can be deduced from field observations and bulk lithogeochemical data. In this study 271 samples representing over 700 m of drillcore were analysed for up to 33 elements. These lithogeochemical data were investigated using a standardization procedure in which analyses were ratioed to the abundances of the relatively immobile detrital components, alumina and zirconium. After this transformation, anomalous abundances of "ore" constituents (Ba, Fe, Zn, Pb, Ag and S) and many other chemical components, were identified in the host rocks beyond the immediate vicinity of the "ore" zone. This procedure also facilitated an estimate of provenance for the host rocks and their relative rates of sedimentation. Geochemical trends are also evident within the "ore" zone. Ba:Sr ratio trends mimic Pb:Zn ratio trends and may be a useful tool in the study and exploration of other stratiform barite deposits. They delineate zoning patterns and may act as a guide to exhalative vent areas which may be of economic interest.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.002 | 0.002 |
| 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) | 0.002 | 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".