Reconnaissance geology and U-Pb geochronology of the west flank of the Coast Mountains between Bella Coola and Prince Rupert, coastal British Columbia
Bibliographic record
Abstract
Metamorphic pendants within and west of the Coast Mountains between Bella Coola and Prince Rupert British Columbia belong to three northwest-trending belts of metasedimentary and metavolcanic rocks. These belts separate Mesozoic and older strata of the Stikine terrane on the northeast from Wrangellia terrane strata on the southwest. The northeastern belt, herein referred to as the Burke Channel assemblage, consists primarily of interlayered quartzite, marble, metapelite, and metavolcanic rocks that are interpreted to have accumulated along a continental margin with one or more phases of arc-type(?) volcanism. Similarities in protoliths and detrital zircon ages indicate that this assemblage correlates with components of the Yukon-Tanana, Nisling, and/or Stikine terranes of northern British Columbia, Yukon, and eastern Alaska. The southwestern belt, referred to as the Banks Island assemblage, consists mainly of quartzite, marble, and metapelite that may also have accumulated in a continental margin setting. The tectonic affinity of these rocks is uncertain. Separating these assemblages is a belt of metasedimentary and metavolcanic rocks of the Alexander terrane and possibly the Gravina belt. Structures bounding the three sets of pendants are not well known, but are interpreted to include: (1) an early Tertiary reverse fault (part of the Coast shear zone) that juxtaposes Stikine strata westward over the Burke Channel assemblage in the Bella Coola area; (2) a mid-Cretaceous thrust fault that juxtaposes the Burke Channel assemblage over Alexander and possibly Gravina strata; and (3) the sinistral Kitkatla fault, which separates the Banks Island assemblage from the Alexander terrane.
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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 | 0.003 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".