The Qingzhen reaction, a fine‐grained mineral assemblage associated with djerfisherite in some <scp>EH3</scp> chondrites: Alteration on the <scp>EH</scp> parent body
Bibliographic record
Abstract
Abstract Enstatite chondrites formed under extremely reducing conditions in the protoplanetary disk. They are derived from two or more parent bodies, EH and EL, and both EH and EL groups contain petrologic type 3–6 samples. The rare lithophile‐ and halogen‐bearing sulfide, djerfisherite, occurs in low abundance in enstatite chondrites, most frequently in the EH3 chondrites. In some EH3 chondrites, but not in EL chondrites, djerfisherite is associated with a fine‐grained mineral assemblage, termed the “Qingzhen Reaction,” which has previously been interpreted as an alteration product of djerfisherite. The Qingzhen Reaction is notable as perhaps the only record of fluid‐mediated alteration on the EH parent body. In this study, we undertook a high‐resolution chemical and mineralogical analysis of the Qingzhen Reaction and its djerfisherite host, in order to determine its composition, relationship to djerfisherite and its formation environment. We show that the Qingzhen Reaction is an alteration product of djerfisherite, predominantly comprised of porous troilite with remnant djerfisherite. Trace quantities of halite and (likely) sphalerite are also present. We suggest that the Qingzhen Reaction formed by the interaction of an anhydrous fluid with djerfisherite on the EH parent body.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| 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 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".