The structurally controlled Zn-Pb-Ag Blende deposit, Yukon, Canada: Geochemical constraints on sulphide mineralization
Bibliographic record
Abstract
The Blende Zn-Pb-Ag deposit is located approximately \n75km northeast of Keno Hill, Yukon, within the southern Wernecke Mountains. Epigenetic mineralization is hosted by dolomitic siltstone of the Paleoproterozoic Gillespie Lake Group, the uppermost unit of the Wernecke Supergroup. Sulphides are found as cements in breccias developed in an axial planer cleavage within the hinge zone of a kilometre scale anticline. The sulphide paragenesis consists of three stages of growth. The earliest is pyrite veining with minor sphalerite which have δ 34 S values of +9.4 to +58.1‰. This is crosscut by main stage mineralization consisting of sphalerite and galena \nwith δ 34 S data that ranges from +15.6 to +34.9‰ and a Pb-Pb \nage of 1.50 to 1.44 Ga, with some pyrite and minor tetrahedrite and chalcopyrite. Coarser euhedral sphalerite and galena make up the late stage of sulphide growth and have isotopic values of +16.3 to +32. 8‰ and a Pb-Pb similar to that of the main stage galenas. The gangue minerals consist of fine to coarse grained dolomite and quartz, and are present in five paragenetic stages. These include the host rock with δ 13\nC of 0.0 to +1.0‰ and δ 18 O of +19.7 to +21.6‰. There are two vein sets that predate sulphide mineralization and these have δ 13 C values of 0.0 to +0.5‰ and δ 18\nO values of +19.6 to +21.7‰. The main stage veining that accompanies the main stage sulphides has a range in δ 13\nC and δ 18O from 0.0 to +0.3‰ and +18.0 to +20.8‰, \nrespectively. Finally, euhedral dolomite that occurs with the late stage sulphide has carbon isotopic data that ranges from -0.5 to + 0.2‰ and δ 18 O from +18.1 to +19.0‰. \nEvidence suggests a Mesoproterozoic age of mineralization that postdates a Paleoproterozoic deformation event, involves circulation of seawater transporting metals and sulphur, and derived components for the gangue mineralogy from the host dolomitic siltstone.
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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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".