1 Exhumation and Uplift History of the Central Coast Mountains, British Columbia, from
Bibliographic record
Abstract
Apatite (U-Th)/He ages reveal three distinct periods in the exhumation history of the central Coast Mountains (~54oN). A well-developed helium partial retention zone indicates little or no exhumation between ~30 and 10 Ma. Beginning at 10 Ma and extending to at least 4 Ma the range experienced steady but slow exhumation of ~ 220 m/Myr. Sometime after 4 Ma the exhumation rate increased by at least a factor of two. An 85 km-long He age transect across the orogen at sea level shows that vertical offsets on post 10 Ma faulting are minor. Furthermore, the sea-level He ages (14 to 2.8 Ma) inversely correlate with mean elevation along the traverse. Our preferred interpretation is that the Coast Mountains first appeared as a significant topographic feature only within the last few Myrs. This history is not consistent with suggestions that uplift and exhumation of the range occurred in the Early- Middle Miocene in association with formation of the Queen Charlotte Basin. We speculate that 2 intense alpine and continental glaciation after 2.5 Ma triggered differential isostatic uplift and creation of the modern topography of the Coast Mountains.
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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 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".