Crystallization of Baddeleyite in Basaltic Rocks from Mars, and Comparisons with the Earth, Moon, and Vesta
Bibliographic record
Abstract
Baddeleyite (ZrO2) is an accessory mineral that occurs in variable abundances in planetary basaltic rocks, depending on melt compositions and crystallization conditions. Location and characterization of baddeleyite in a range of planetary basaltic rocks by both automated and manual electron microbeam methods reveals random distributions of grains exhibiting planar and sometimes concentric cathodoluminescent banding. Results from basaltic martian meteorites (shergottites) are emphasized, as their conditions of crystallization are representative of the broad range observed for other planetary basaltic rocks including lunar meteorites and the asteroidal eucrites. We find that baddeleyite forms from late-stage igneous melt in all of these planetary samples, associated with ferroan pyroxene and olivine, Fe-Ti oxides, sulfides, and phosphates, and that it is most common at higher oxygen fugacity (≥⃒ QFM). We conclude that the primary factors affecting baddeleyite occurrence are Zr concentrations in late-stage melts, SiO2 activity, and oxygen fugacity-dependent compatibilities of Zr in Fe-Ti oxides.
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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 | 0.004 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".