TWO STAGES OF "METAMORPHIC VERMICULITE" GROWTH IN SCHISTS FROM THE MALAGUIDE COMPLEX, BETIC CORDILLERA, SPAIN
Bibliographic record
Abstract
Two texturally different types of “metamorphic vermiculite ” were identified in EMPA and TEM–AEM investigations of schist samples from the deepest Paleozoic rocks of the Maláguide Complex, Betic Cordillera, Spain. The two generations of “vermiculite ” formed during late stages of Alpine metamorphism. The first generation occurs as grains parallel to the main schistosity, whereas the second one appears as a pseudomorph after garnet. The EMPA data reveal lower Al2O3 and MgO con-tents for the first generation, whereas the “vermiculite ” pseudomorph after garnet shows a lower CaO + K2O + Na2O content. On the other hand, EMPA FeO and TiO2 data are not discriminants because submicrometric inclusions of Fe and Fe–Ti oxides affect the composition of the first generation of “vermiculite”. A more accurate structural and chemical differentiation between the two generations of “vermiculite ” was obtained by TEM–AEM analyses. The first generation of “vermiculite ” grains is characterized by interstratifications of layers 10 and 14 Å thick, belonging to vermiculite (A) and chlorite (B), respectively. Regular sequences 24 and 34 Å thick, corresponding to A + B and 2A + B sequences, also are present. These grains appear locally retrograded to kaolinite and Fe oxide. The second generation of “vermiculite ” pseudomorphic after garnet consists of more complex chlorite, muscovite, and vermiculite intergrowths, with isolated packets about 1000 Å thick of an aluminous smectite. The Fe/(Fe + Mg) value, based on AEM analyses, clearly distinguish between the first and second generations; average values of 0.39 and 0.55 are obtained, respectively. The first generation of “vermiculite ” belongs to the synkinematic main stage of mineral growth during the
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".