KANONAITE FROM THE METAMORPHIC SOLE OF THE OMAN OPHIOLITE: EVIDENCE FOR HIGH-f (O2) CONDITIONS DURING RETROGRADE METAMORPHISM
Bibliographic record
Abstract
Kanonaite has been discovered in a metachert pebble derived from the metamorphic sole of the Oman ophiolite in United Arab Emirates. The kanonaite rims (50 m in maximum width) manganian andalusite with a distinct chemical discontinuity, and is also found intergrown with muscovite. It contains up to 65 mol. % Mn3+AlSiO5, and the Fe analogue, Fe3+AlSiO5, typically accounts for 3–12 mol. % of the total. Petrographic features suggest that kanonaite formed by reaction between manganian andalusite and quartz, with the addition of K introduced by an aqueous fluid, according to: 6(Al0.62Mn3+0.30Fe3+0.08)AlSiO5 + 3SiO2 + 2K+ + 3H2O → 3(Mn3+0.60Al0.36Fe3+0.04)AlSiO5 + K2(Al3.64Fe3+0.36)(Si6Al2)O20(OH)4 + 2H+. The formation of kanonaite can be attributed to a retrograde hydration event under high-f(O2) buffering according to the solid–solid reactions: 14Mn2O3 + 4SiO2 = 4Mn7SiO12 + O2 and Mn2O3 + SiO2 + Al2SiO5 = 2MnAlSiO5. The formation of kanonaite suggests that the retrograde metamorphism in the sole of the Oman ophiolite involved localized conditions of high f(O2).
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".