Timing the opening of the Queen Charlotte basin, British Columbia, with Apatite Fission Track Thermochronology
Bibliographic record
Abstract
Eight new apatite fission track (AFT) analyses from the Queen Charlotte Basin, British Columbia, reveal three distinct periods of cooling. The basin formed as the result of regional extension, as the North American plate boundary transitioned from a continental subduction zone to a transform margin. Samples were collected from localities across two major normal faults, the Grenville Channel fault and Principe Laredo fault. This study uses AFT analyses, which document the thermal histories of rocks from ~130-60?C, to examine the extensional history of the basin. Three groups of AFT ages can be interpreted to represent three separate stages of extension, beginning with the initial transition in plate boundary type at ~51-45 Ma, then continuing with extension accommodated by normal faulting from ~32-34 Ma, followed by volcanism in the most recent stage of development, ~17-19 Ma. The opening of the Queen Charlotte Basin lasted for a long period of time, ~30 million years, with distinct periods of faulting and volcanism, as proposed by Rusmore et al., ( in review ). This study offers a more complete model for the opening of the Queen Charlotte Basin.
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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 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 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".