Orogenic Gold mineralization at 3Ace and Geochemical Characteristics of Quartz Monzonite Dikes at Sprogge, South-east Yukon
Bibliographic record
Abstract
3Ace and Sprogge are two Au occurrences in the southeast Yukon, Selwyn Basin. Gold mineralization at 3Ace was previously believed to be intrusion-related, however, recent petrography and geochemical analysis show mineralization to be associated with mid- Cretaceous orogenesis. Gold occurs along fractures within quartz veins hosted in metasediments of the Neoproterozoic Yusezyu Formation of the Selwyn Basin, and precipitated from low salinity, CO2-rich acidic fluids at temperatures around 300°C. Stable isotopes show evidence of fluid mixing and a significant meteoric water component in the system, but a magmatic contribution cannot be ruled out. X-ray diffraction was used to define alteration assemblages associated with Au. Geochemical analysis was also carried out at Sprogge to garner a better understanding of the regional geology and potential for mineralization. Radiogenic isotopic compositions of quartz monzonite dikes at Sprogge yielded estimated ages between 95.7 ± 2.0 Ma and 103.5 ± 1.2 Ma. Whole rock geochemical analyses indicate the quartz monzonite dikes were produced from similar petrogenetic processes to the Hyland and Tungsten plutonic suites.
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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 | 0.000 | 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".