Microstructural and mineralogical analysis of greenschist-facies deformation in the eastern Yukon-Tanana terrane, Yukon, Canada
Bibliographic record
Abstract
The Yukon-Tanana terrane of the northern Canadian Cordillera experienced multiple episodes of mafic-intermediate volcanism during the Paleozoic, followed by polyphase deformation during its accretion to the North American continent. This study seeks to analyse the deformation history of a heterolithic greenschist unit that is exposed near the Boswell River in south-central Yukon. This greenschist unit, which is coincident with an aeromagnetic high, includes thinly layered intervals that exhibit centimeter to meter-scale folds and crenulations. Using an oriented greenschist facies sample collected from a meter-scale fold during field mapping, a detailed microstructural approach was applied to determine the number and nature of deformation events recorded in the area. Subsequent petrographic analysis was conducted to identify the minerals present and establish the temperature during deformation. Observations show that the main mineral phases are quartz-muscovite-chlorite, in addition to a variety of sulphide minerals, some of which show compositional zonation. A fracture runs through the slide, bearing crushed mica along one border, possibly indicative of shear. Based on these observations, it was established that the sample records at least three distinct stages of deformation. To further constrain the deformation history, use of a scanning electron microscope (SEM) was employed to link the observations to the larger-scale tectonic evolution of the area.
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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 | 0.002 | 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".