ACICULAR SPHALERITE ENRICHED IN Ag, Sb, AND Cu EMBEDDED WITHIN COLOR-BANDED SPHALERITE FROM THE KOKANEE RANGE, BRITISH COLUMBIA, CANADA
Bibliographic record
Abstract
Sphalerite from the Kokanee Range, British Columbia, displays color banding ranging from light to dark brown. Sphalerite forms massive layers with a dark base enriched in Fe and Cu. Layers have sharp boundaries that can be planar or undulating. The base of the sphalerite layers commonly contains acicular crystals of sphalerite oriented perpendicular to the layer boundary. Acicular sphalerite is enriched in Sb, Ag and Cu, which substitute for Zn in the structure. The base of the layers is commonly marked by chains of complex inclusions of chalcopyrite, galena, pyrargyrite and freibergite, which mimic color banding. The layer thickness displays a lognormal distribution ascribed to a random process; it is interpreted to be dependent on the amount of hydrothermal fluid introduced within a fracture prior to precipitation of a layer. The acicular sphalerite probably inverted from rapidly precipitated wurtzite formed from a solution enriched in Cu, Fe, Ag and Sb, an inference that is supported by chains of sulfides and sulfosalts at the base of ferroan sphalerite layers. The precipitation of acicular wurtzite would have depleted the solution in Cu, Ag, Sb, the acicular crystals becoming embedded in Zn-rich sphalerite. Under those conditions, the color banding of sphalerite is controlled by local conditions, which prevents its use for correlation (sphalerite stratigraphy) from one vein to the other.
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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 | 0.002 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".