ECANDREWSITE - ZINCIAN PYROPHANITE FROM LUJAVRITE, PILANSBERG ALKALINE COMPLEX, SOUTH AFRICA
Bibliographic record
Abstract
Les titanates du groupe de l'ilmenite sont des mineraux accessoires relativement repandus dans les venues de syenite nephelinique agpaitique (lujavrite) du complexe alcalin de Pilansberg, en Afrique du Sud. Ils ont cristallise en trois generations et definissent une solution solide continue entre ecandrewsite et pyrophanite, allant de (Zn 0 . 8 1 Mn 0 . 1 2 Fe 0 . 0 7 )TiO 3 a (Mn 0 . 9 3 Fe 0 . 7 )TiO 3 . La generation la plus precoce d'ecandrewsite ferreuse et manganesifere, de composition tres variable, (Zn 0 . 8 1 - 0 . 5 3 Mn 0 . 3 3 - 0 . 1 2 Fe 0 . 1 1 - 0 . 0 4 )TiO 3 , se voit remplacee par la pyrophanite zincifere, (Mn 0 . 8 2 - 0 . 3 4 Zn 0 . 5 0 - 0 . 2 0 Fe 0 . 1 3 - 0 . 0 6 )TiO 3 . La generation tardive de cette serie est faite de pyrophanite avec seulement des traces de zinc, et montre une evolution compositionnelle vers la pyrophanite ferreuse. Ces trois generations de titanates de Zn-Mn, etablies selon des criteres paragenetiques et compositionnels, ont cristallise au cours de l'alteration subsolidus de la lujavrite en presence de fluides alcalins deuteriques en evolution. L'enrichissement de ces fluides en Zn, Mn, et Ti est le resultat de la destabilisation de titanosilicates et de zirconosilicates precoces contenant du Zn et du Mn. Nous etablissons pour la premiere fois la presence d'une solution solide quasiment complete entre ecandrewsite et pyrophanite (ZnTiO 3 - MnTiO 3 ).
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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 | 0.001 | 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) | 0.002 | 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".