Quartz and zircon in garnet elastic geobarometry of HP rocks from the Sesia Zone
Bibliographic record
Abstract
The Sesia zone is a rifted portion of the Adriatic Margin that subducted to high-pressure conditions during the Alpine Orogeny. It consists of two main complexes: the Internal Complex (IC) and the External Complex (EC). The IC is made up of polymetamorphic micaschists, eclogites, and ortho-gneisses equilibrated at eclogite facies conditions; the EC consists of alpine monometamorphic orthogneiss with minor paragneiss and quartzites metamorphosed at epidote blueschist facies conditions and intensely retrogressed at greenschist facies conditions. The question is therefore to understand if we can trace the Alpine metamorphic history through methods that do not rely only on chemical equilibration. To tackle this objective, we used elastic geobarometry to derive pressure and temperature (P-T) conditions reached by three micaschists from the IC and one garnet-orthogneiss from the EC. Entrapment P obtained for the quartz inclusions in garnet in the IC range from 1.5-2 GPa at 600-650°C, in agreement with the P-T estimates determined through thermodynamic modelling. Coupled quartz and zircon in garnet geobarometry in the garnet-orthogneiss from the EC also display P-T conditions of 1.8 GPa and 650°C. These estimates disagree with the greenschist facies mineral assemblage of the rock (Ttn + Grt + Phg + Chl) and with the results of thermodynamic modelling (0.6-0.8 GPa and 500°C). The misfit in P-T estimates between elastic geobarometry and thermodynamic modelling might be due to an elastic reset of the quartz and zircon host-inclusion pairs at HP conditions. The use of coupled elastic geobarometry and thermodynamic modelling can help to unravel complex tectonometamorphic histories.
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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 | 0.000 | 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".