Bibliographic record
Abstract
The small Seagull-Thirtymile suite of mid Cretaceous tin-related granites is found in the south-central Yukon Territory of Canada, where they intrude the displaced, and possibly accreted, Dorsey terrane of uncertain affinity to the continent. These one-mica generally leucocratic granites are atypical of the calc-alkaline batholiths found in the Omineca plutonic belt of the Cordillera. They have a major- and trace-element chemical signature similar to post-orogenic and alkaline granitoids and contain small volumes of extremely fractionated, F-Li-rich leucogranites (e.g. with Rb/Sr ratios >3000) as their youngest components, as well as an alaskite lithofacies in the STQ stock. Two possible fractionation mechanisms are indicated for the evolved lithofacies: enrichment in quartz in low-F apophyses above the main batholith and enrichment in albite, where high-F conditions prevailed. Fe-Li micas from the suite are similar to those reported for Cornubia and are considered to be primary, with no indication of either the muscovite-zinnwaldite or phengite-zinnwaldite substitution series. Those micas from the less-evolved granite facies have a more Fe-rich composition than the Cornubian examples and their composition may be diagnostic of these 'quasi-A-type' granites. Calculation of relative halogen fugacities in aqueous (magmatic) fluid existing with magma indicate that a Cl-rich (relative to F) hydrothermal system evolved, which is consistent with a shallow, periodically open system that would have allowed 'scavenging' and transport of ore met als from the granite. Existence of A-type granites in the Cordillera immediately following peak plutonism, without sufficient time gap to be able to label them truly Post-Orogenic is unexplained by the current tectonic model that has not addressed the possibility of either a period of crustal extension beginning at ≈100Ma or intrusion of basic magma perhaps to middle crustal levels.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.003 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 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".