Plagioclase under compression: A path to diaplectic glass and maskelynite
Bibliographic record
Abstract
Diaplectic glass and maskelynite in shocked plagioclase serve as key diagnostic features for high level of shock metamorphism in impact craters and meteorites. However, their formation mechanisms remain unclear and have long been argued, mainly due to the lack of phase diagram for plagioclase with extended pressure-temperature conditions. We report the stabilities of labradorite and anorthite at pressure up to 65 gigapascals and temperature up to 4000 kelvin. Our experimental results reveal the pressure-temperature conditions for amorphization, decomposition, and melting of labradorite and anorthite. The boundary between amorphous plagioclase and crystalline high-pressure phases in our phase diagram indicate diaplectic glass can form at 1300 to 1500 kelvin, and the melting line suggests that maskelynite can be generated above 3000 kelvin at high pressures. Formation conditions of diaplectic glass and maskelynite in plagioclase-bearing rocks are also suggested by the combination of phase diagram and shock Hugoniot data. These findings will advance our understanding of the bombardment history on rocky planetary surfaces.
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 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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".