The Early Jurassic Metamorphic History of the Yukon-Tanana Terrane of Northwestern British Columbia: Insights from a New Inverse Garnet Fractionation Modelling Technique
Bibliographic record
Abstract
A metamorphic study was conducted on metapelites of the Boundary Ranges and Florence Range metamorphic suites in the Yukon-Tanana terrane of north-western British Columbia. A new inverse garnet fractionation modelling technique was developed as the software program G FRAC. Through the combined application of G_FRAC and THERIAK-DOMINO, and its integration with Lu-Hf garnet-whole rock age dating of select samples, prograde and retrograde P-T points were estimated for Early Jurassic metamorphism of these two suites. The Boundary Ranges Suite experienced two garnet growth events in this period at 201.7±2.8Ma and 192.4±0.4Ma with the later event reaching peak conditions of ∼ 550◦C and 700 to 800MPa. The Florence Range suite experienced a synchronous garnet growth event between 190.9±3.3Ma and 185.3±1.1Ma reaching a peak pressure of ∼1000MPa at ∼620◦C and a peak temperature of 690 to 730 ◦C at 600 to 750MPa before cooling to ∼610◦C and ∼670MPa.
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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 | 0.002 |
| 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) | 0.001 | 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".