Impact-generated magnetite in Chang’e-5 soil as a potential recorder of lunar magnetism
Bibliographic record
Abstract
Abstract Magnetite is a principal paleomagnetic recorder on Earth, but lunar magnetism is thought to be dominated by metallic iron and Fe-Ni alloys, with magnetite rare and typically sub-micrometer within troilite. We identify nanometer- to micrometer-scale magnetite in pentlandite-troilite assemblages from a Chang’e-5 regolith breccia. Magnetite occurs at and within pentlandite, locally enclosing pentlandite nanoinclusions, implying a formation pathway distinct from troilite-hosted occurrences. Textures and compositions indicate sequential crystallization from an impact-generated Fe-Ni-S-O melt: rapid pentlandite growth along troilite margins followed by magnetite nucleation at sulfide-silicate interfaces. The lunar low oxygen fugacity stabilizes Fe 2+ -enriched magnetite, unlike terrestrial analogues. High crystallinity and single-domain to single-vortex states indicate strong remanence stability, making these grains reliable recorders of the contemporaneous lunar magnetic fields. These results broaden the inventory of lunar magnetic carriers, demonstrate impact-driven magnetite formation under lunar redox conditions, and motivate use of magnetite to refine the Moon’s magnetic history.
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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 | 0.000 | 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 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".