U-Pb dates from the Scotia-Quaal metamorphic belt, Coast Plutonic Complex, central-western British Columbia; Radiogenic age and isotopic studies: Report 14
Bibliographic record
Abstract
U-Pb data are reported for two rocks from the Scotia Quaal metamorphic belt. A metavolcanic gneiss yields an igneous crystallization age of 370.3 ± 2.8 Ma, an age for metamorphic zircon growth of 66.4 ± 0.7 Ma, and a titanite cooling age of 62.0 ± 0.8 Ma. A detrital zircon grain from a quartzite yields an interpreted crystallization age of 386 +67/-70 Ma, giving a maximum age for deposition of the quartzite protolith that is synchronous with arc igneous activity in the area. Another detrital zircon from the same sample is Late Archean to Early Paleoproterozoic; indicat- ing a cratonal source for the quartzite protolith. These ages and mildly evolved Nd-Sr isotopic data suggest a mixed active arc-cratonal provenance for the quartzite. Latest Cretaceous metamorphic zircon growth and Paleocene titanite cooling ages recorded across much of the northern Scotia Quaal belt reflect the intrusion of the composite Quottoon pluton.
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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 | 0.004 | 0.005 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".