Late Cretaceous ages for the Chelaslie River and Tetachuck-north plutons, northern Tetachuck Lake map area, central British Columbia
Bibliographic record
Abstract
New U-Pb isotopic data indicate Late Cretaceous crystallization and cooling ages for zircon and titanite from two plutons in the northern Tetachuck Lake map area (NTS 93 F/05). The Chelaslie River biotite-hornblende diorite and monzodiorite intruded Middle Jurassic Naglico and Entiako formations of the Hazelton Group and are nonconformably overlain by Tertiary volcanic rocks. Zircon in the pluton has a crystallization age of 80.3 ± 0.2 Ma and an equivalent but less precise titanite age indicates rapid postcrystallization cooling. Hornblende-biotite quartz monzodiorite of the Tetachuck-north pluton is inferred to intrude the Middle Jurassic Naglico formation. Uranium-lead ages for titanite indicate a minimum crystallization and cooling age of 76.6 ± 0.9 Ma; a maximum crystallization age of 79.3 ± 0.2 Ma derives from a single concordant zircon analysis. The newly recognized Late Cretaceous intrusions are correlated with and extend eastward the distribution of the metallogenically important Bulkley plutonic suite.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.013 | 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".