CELSIAN, (Ba,K)-FELDSPAR AND CYMRITE FROM SEDEX BARITE DEPOSITS OF ZAMORA, SPAIN
Bibliographic record
Abstract
(Ba,K)-feldspars occur with cymrite as thin layers of massive fine-grained celsian interbedded with apatite, sulfides and barite, or diseminated in the thin-bedded barite-bearing siliceous and carbonate beds ranging in thickness from 0.15 to 0.40 m in three barite deposits in Zamora, Spain. The (Ba,K)-feldspars, which include celsian, hyalophane and K-feldspar, vary from 1.3 t o 96.4 mole % BaAl2Si2O8, but exhibit two discontinuities, at 8–24 and 40–92 mol.%. The associated cymrite shows 1.3–3 mol.% KAlSi3O8 in solid solution. Relict celsian has a similar K content, 1.2–2.8 mol.% KAlSi 3O8. The Ba-rich feldspars may have been deposited i) as an authigenic phase, or ii) by replacement of authigenic barite during a later diagenetic or metamorphic event. Cymrite and celsian were formed under low-grade dynamothermal metamorphism that affected Paleozoic sedex barite deposits of Zamora. Fluid-inclusion studies indicate 350 °–370°C and 1.5 kbars as conditions of equilibration. Those data, and the presence of vitrinite (350°C), indicate the upper limit of P–T reached. These conditions are close to the reaction curve for celsian + H 2O = cymrite. The stability field of cymrite confirms that this mineral can be stable in low-P – low-T metasedimentary environments. That reaction has geobarometric and tectonothermal importance.
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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 | 0.002 | 0.001 |
| 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".