The Tatshenshini shear zone (new) in southwestern Yukon, Canada: Comparison with the Coast shear zone in British Columbia and southeastern Alaska and implications regarding the Shakwak suture
Bibliographic record
Abstract
The Tatshenshini shear zone extends from Klukshu Lake in southwestern Yukon, southward to the Yukon‐British Columbia border. Deformation in the shear zone ranges from hundreds of meters to a few kilometers in width and is characterized by protomylonitic and mylonitic turbidites belonging to the Dezadeash Formation (Jurassic‐Cretaceous) that are overlain by protomylonitic granodiorite of the Ruby Range Batholith (Late Cretaceous‐Tertiary). The Dezadeash Formation‐Ruby Range Batholith contact, bedding, and deformation and magmatic fabrics within the Tatshenshini shear zone are all coplanar, striking northwest‐southeast and dipping moderately to the northeast. Kinematic indicators from the Dezadeash Formation and Ruby Range Batholith record a top‐to‐the‐southwest sense of shear. Collision of the Insular superterrane with the Intermontane superterrane by the mid‐Cretaceous resulted in the eastward directed underplating of Yukon‐Tanana terrane‐equivalent rocks by the Dezadeash Formation and the formation of the Tatshenshini shear zone. The Tatshenshini shear zone preceded and controlled emplacement of the Ruby Range Batholith, but magmatism, ending ∼ 58–56 Myr ago, outlasted deformation. The results of this work support the correlation of the Ruby Range Batholith with the adjacent Great Tonalite Sill in southeastern Alaska. It also suggests a linkage between the Tatshenshini shear zone and the Coast shear zone in southeastern Alaska and along which the Great Tonalite Sill was emplaced. The Tatshenshini shear zone and the Coast shear zone represent the coda of long‐lived tectonism along the Shakwak suture, the accretionary boundary between the Insular and Intermontane superterranes.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.006 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".