THE CONTRASTING RESPONSES OF MUSCOVITE AND PARAGONITE TO INCREASING PRESSURE: PETROLOGICAL IMPLICATIONS
Bibliographic record
Abstract
The incorporation of Fe, Mg, and Si into muscovite in response to increase of pressure (P) has long been recognized. In the context of the appropriate mineral assemblages, the extent of this substitution has been calibrated to serve as a very useful geobarometer for high-P parageneses. In marked contrast, little or no Fm i.e., S(Mg + Fetotal), substitutes into paragonite regard-less of P. To date, Fm substitution into muscovite has been considered only in terms of DVr with little consideration of the crystallochemical aspects of this substitution. Moreover, the substitution seems to occur in response to simple exchange-reactions involving little or no dehydration. Such reactions typically have a negligible DVr. Drawing upon the implications of studies combining high-P refinement of the crystal structures and measurement of compressibility, we suggest that high P causes struc-tural changes in low-Fm muscovite that destabilize it. However, implementation of the Fm substitution facilitates structural adjustments, which reduce this instability. In contrast, paragonite is not only intrinsically less compressible than muscovite, but any substantial amount of Fm substitution would destabilize it.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.000 | 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 teacher head, 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".