DISSAKISITE-(La), MUKHINITE, AND CLINOZOISITE: (V,Cr,REE)-RICH MEMBERS OF THE EPIDOTE GROUP IN AMPHIBOLE - PYRITE - PYRRHOTITE METABASIC ROCKS FROM PEZINOK, RYBNICEK MINE, WESTERN CARPATHIANS, SLOVAKIA
Bibliographic record
Abstract
Epidote-group minerals (EGM), including some of unusual chemical compositions, occur with pyrite and pyrrhotite in the Lower Paleozoic carbonaceous amphibole schist of the meta-ophiolitic Pernek Group at Rybnicek, near Pezinok, southwestern Slovakia. Euhedral to anhedral dissakisite-(La), mukhinite, and clinozoisite are associated with V- and Cr-rich garnet (goldmanite – grossular – uvarovite solid-solution), V- and Cr-rich muscovite, amphibole-group minerals (magnesiohornblende, tremolite, actinolite, and edenite), diopside, titanite, albite, quartz, siderite and sulfide minerals (pyrite, pyrrhotite, rarely chalcopyrite and sphalerite). Strong compositional zoning and three stages of EGM formation were found. The core of EGM grains consists of V- and Cr-rich dissakissite-(La) (V ≤ 0.33 apfu , Cr ≤ 0.44 apfu ); it grades into REE-rich mukhinite of varying Cr contents (REE ≤ 0.46 apfu , 0.13 to 0.43 apfu Cr). Clinozoisite I, which is V- and Cr-rich (V ≤ 0.40 apfu , Cr ≤ 0.42 apfu ), occurs as an overgrowth upon the dissakisite–mukhinite cores. A second generation of V-, Cr- and REE-poor clinozoisite (clinozoisite II) has replaced mukhinite and clinozoisite I at the grain rim, and it is also found in veins that cut the grains. Many substitutions can change the compositions of the EGM: V 3+ and Al 3+ cause the VAl −1 substitution; CrAl −1 and CrV −1 substitutions may be extensive, but both are of limited extent, and Cr 3+ is partly independent of the contents of substituents; Mg 2+ substitution reflects the REEMgCa −1 Al −1 , REEMgCa −1 V −1 , and REEMgCa −1 Cr −1 exchange-vectors. Most REE patterns show enrichment in the light REE. Chondrite-normalized REE patterns show a negative Ce anomaly and a slightly positive Eu anomaly in clinozoisite I and dissakisite-(La), but mukhinite lacks this Eu anomaly. Dissakisite-(La) most likely originated at or near the peak conditions of contact thermal metamorphism induced by the Hercynian-age intrusion of the Modra granitic massif, whereas mukhinite and clinozoisite I formed during retrogression. Clinozoisite II may reflect the younger (Alpine?) low-grade metamorphic overprint.
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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 | 0.000 |
| 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 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".