Development of the Selwyn Range Shear Zone in relation to middle Miette facies change
Bibliographic record
Abstract
The Selwyn Range comprises part of the Western Main Ranges of the Southern Canadian Rocky Mountains. The region is dominated by the doubly-plunging Fraser River Antiform that exposes the deepest structural and stratigraphic levels of the foreland fold and thrust belt. The mountain belt is underlain by the Hadrynian Miette Group turbidite dominated sequence. The Old Fort Point Formation forms a prominent marker unit in the conglomerate dominated middle Miette Group. Regional mapping of the OFP allows definition of a prominent facies change occurs in the middle Miette Group, represented by a westward transition from a conglomerate to shale dominated sequence. The west flank of the Fraser River Antiform has developed a prominent deformed zone referred to as the Selwyn Range Shear Zone. The shear zone is developed in dominantly politic strata of the middle Miette Group and is overlain by a train of open symmetric folds with a total shortening of ~ 20%. This zone is characterised by progressive development of finite strain over 50 m of stratigraphic section to a maximum and then decreasing over another 50 m. The importance of this deformation has been debated and several widely varying models have been proposed to explain this feature. Fabrics associated with the shear zone suggests that it is related to interlimb slip on the developing Fraser River Antiform. The intense deformation on the west flank is largely related to the prominent facies change from more competent conglomerate dominated middle Miette Group in the east to less competent pelites in the west. This implies the shear zone is not associated with any significant movement or shortening in the western Main Ranges.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 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) | 0.003 | 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".