Quaternary alkaline and calc-alkaline basalts in southern British Columbia: mixed signals from mantle sources above the southern edge of the Juan de Fuca–Pacific slab window
Bibliographic record
Abstract
Subaerial lava flows of the Quaternary valley lavas mark the end of Chilcotin Group intraplate volcanism in southern British Columbia.Two geographically defined units are recognized: the Quilchena and Lambly Creek lavas.Erupting intermittently from discrete centres, lava flowed into existing paleodrainages from 1.5 Ma (Lambly Creek) to 780-100 ka (Quilchena).Erosion removed most of the estimated 8.8-21.1 km 3 of lava.Internal features are well preserved, some indicative of flow inflation and transport direction.The lavas are alkaline to calc-alkaline basalts, trachy-basalts, basaltic andesites and trachy-basaltic andesites, with trace element characteristics similar to ocean island basalt and εNd values from +8.0 to +8.4.The magmas resulted from partial melting of garnetiferous asthenosphere that upwelled through the subducted Nootka Fault and thermally eroded Explorer and northern Juan de Fuca plates south of a slab window.Geochemical modelling indicates that the mantle source was heterogeneous, composed of variably enriched peridotite.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.002 | 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".