Towards Deciphering Metamorphic Reaction Kinetics through Porphyroblastic Textural Analysis in the Bugaboo Contact Aureole (South Eastern British Columbia, Canada)
Bibliographic record
Abstract
The relative rate of intergranular diffusion and interfacial attachment of chemical species during low--pressure metamorphic reactions is determined through analyzing the texture of porphyroblastic phases in the Bugaboo contact aureole.The observed mineral assemblages are predicted to be in equilibrium from 500--590°C at 1.60 kbar with graphite and a COH--bearing fluid.Porphyroblasts of Bt + And + Crd ± Pl within the outer aureole display syn--kinematic growth textures while the inner aureole consists of pre--kinematic Bt + And + Crd + Kfs porphyroblasts.Chemical homogeneity of Bt + Crd across the aureole, along with similar chemistries for prograde and retrograde Chl, indicate chemical equilibration during retrograde metamorphism.Mineral chemistries therefore do not provide reliable P--T estimates for incipient porphyroblast crystallization, peak metamorphism nor the relative rate between reaction processes.The three-dimensional spatial distribution of Bt + Crd porphyroblast centers and sizes from the outer aureole is obtained using XR--CT to study the effects of metamorphic reaction processes on resultant porphyroblastic texture.Mineral texture is shown to be more reliable over mineral chemistry when deciphering the kinetics of metamorphic processes.
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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 | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| 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".