Metamorphic history of the Coast Mountains orogen, western British Columbia and southeastern Alaska
Bibliographic record
Abstract
The northern Coast Mountains are underlain by the Coast Plutonic Complex, which separates the Intermontane and Insular superterranes. Syndeformational contact and regional metamorphism associated with compressional and transpressional tectonic events occurred from about 101 to 50 Ma, followed by contact metamorphism adjacent to late Oligocene and Miocene plutons and stocks. Metamorphic events comprise pre-101 Ma regional metamorphism (M R 1 ), 101-90 Ma contact metamorphism (M C 2 ) and related regional metamorphism (M R 2 ), 90-85 Ma regional metamorphism (M R 3 ) that formed during thrusting that inverted metamorphic isograds, and 72-50 Ma contact and regional metamorphism (M C - R 4 ) in the central part of the orogen. Middle to Late Cretaceous moderate- to high-pressure metamorphic assemblages in the western metamorphic belt record tectonic burial and subsequent exhumation. Late Cretaceous to Tertiary sillimanite-zone metamorphic assemblages in the central pluton gneiss and the adjacent edge of the western metamorphic belt record emplacement and subsequent exhumation of plutons in the Paleogene Coast Mountains batholith, including Coast Plutonic Complex sill plutons. The final metamorphic event was ca. 25-20 Ma contact metamorphism (M C 5 ) associated with gabbroic and granitic plutons.
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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 | 0.000 |
| 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".