Unravelling the P-T-t History of Grenvillian Metamorphism in the Mazinaw Domain, Southeastern Ontario: Insights from Phase Equilibria Modeling and Geospeedometry
Bibliographic record
Abstract
P-T-t conditions of Grenvillian metamorphism were derived from mineral assemblages, growth zoning in garnet and monazite geochronology from metapelites of the Flinton Group in southeastern Ontario.Initial conditions of garnet growth determined through isopleth thermobarometry yielded 3.7 kbar and 515°C and geothermal gradients of 40°C km -1 .Phase equilibria modeling revealed an increase from 615 to 715°C and 5.6 to 7.9 kbar across the study area.Forward modeling of growth zoning in a population of garnet porphyroblasts with the THERIA_G software revealed a clockwise path over the P-T interval 3.7 to 5.9 kbar and 513 to 615°C.Diffusional relaxation of growth zoning in relatively small porphyroblasts of the population provided an average heating rate of 2°C Ma -1 .In situ U-Pb monazite geochronology revealed a major age population at 977 ± 4 Ma, interpreted to represent monazite growth at the expense of allanite near the peak conditions of garnet growth and metamorphism.
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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 | 0.000 | 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".