A review of the geology of the Canadian Cordillera and kinematic restoration of its dextral strike-slip faults since the mid-Cretaceous
Bibliographic record
Abstract
A key issue for the North American Cordillera remains the non-reconcilable estimates from geological and paleomagnetic evidence for the northward translation of tectonic blocks relative to the stable North American continent. This study investigated and kinematically restored the post mid-Cretaceous dextral strike-slip motion of the Canadian Cordillera that facilitated this northward translation. The restoration was made based on a review of geological observations mainly consisting of dextral strike-slip motion. As displacement must be accommodated in some way along the length of the Cordillera we have identified several open problems in connecting displacement throughout the Cordillera. Although these connections remain a problem, the total amount of displacement is generally well constrained. Restoration of this displacement results in a significant mismatch between our model and the predicted displacement from paleomagnetic data, even for the western most displaced terranes (Wrangellia), where our model predicts < 1000 km of northward displacement relative to the NA craton. The eastern terranes also show a significant mismatch: about 2000 km of post-90 Ma northward displacement is predicted for the more eastern Yukon-Tanana terrane based on palaeomagnetic estimates of the Carmacks Group, whereas our restoration based on geological constraints restores less than 500 km of displacement during this time. A solution to this problem should therefore be sought to the east and could be formed by a ‘cryptic suture’ in the eastern Canadian Cordillera, perhaps hidden below the Rocky Mountains in the Foreland Belt, as has been suggested by previous research.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.006 | 0.013 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".