Deformation History of the Pasayten Fault Zone, North Cascades, Washington and British Columbia
Bibliographic record
Abstract
The Pasayten fault extends ~250 km from Washington to British Columbia (BC), roughly following the controversial, paleomagnetically defined “Baja BC” boundary. This study investigated the deformation history of the Pasayten fault zone through mapping contacts, measuring orientations of foliations, lineations, and folds, and examining kinematic indicators in the northern segment in BC and in the southern projection of the fault in Washington. In the northern area, the ~110-105 Ma Pasayten fault separates the Jurassic-Cretaceous Methow basin from the Middle Jurassic to mid-Cretaceous Eagle Plutonic Complex and Permian Eastgate-Whipsaw metamorphic belt to the northeast. Structural orientations and kinematic indicators in outcrops and thin sections demonstrate ductile sinistral movement of the fault with a small component of reverse or normal slip. Any dextral slip was brittle. The southern area is on strike with the projection of the fault where the Cretaceous Okanogan Range batholith intrudes undated Leecher Metamorphics. Based upon the lack of offset contacts and foliations which strike discordant to the projection of the fault, the Pasayten fault does not continue south of its previously mapped termination; its slip was likely transferred to the Cretaceous Red Shirt and Methow River thrusts. Therefore, the Pasayten fault is not a major structure responsible for postulated dextral transport of the Baja BC hypothesis.
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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 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 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".