Ore mineralogy and mineral chemistry of the Whale Tail zone, Amaruq gold deposit, Nunavut
Bibliographic record
Abstract
The 6 Moz Au (190 metric t Au) Amaruq deposit is hosted in a sequence of complexly deformed and metamorphosed chert, graphitic argillite, silicate-facies banded iron formation and mafic-ultramafic volcanic rocks of the Archean Woodburn Lake group in the Kivalliq region of Nunavut. The region was affected by Archean and Paleoproterozoic orogeneses and most Au occurrences are interpreted to be associated with the ca 1.91-1.81 Ga Trans-Hudson event. However, new work indicates that some of the Au may be Early Paleoproterozoic or perhaps even Archean, raising uncertainty about the timing of the Au ore-forming event(s) versus the tectonometamorphic evolution of the region. The arsenopyrite- and pyrrhotite-dominant Au mineralization of the Whale Tail zone of the Amaruq deposit was sampled from representative drill core to determine the timing of Au introduction relative to the main deformation and associated metamorphism in the study area. Petrography and micro-analyses indicate that the sulphides underwent a complete prograde-retrograde metamorphic cycle, with pre-peak metamorphism Au-rich arsenopyrite being replaced by an assemblage of syn-peak prograde Au-rich löllingite and pyrrhotite. This was followed by retrogression of löllingite to Au-poor secondary arsenopyrite and native Au and electrum inclusions.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".