PETROLOGY OF GABBROIC TO PLAGIOGRANITIC ROCKS FROM SOUTHERN TUSCANY (ITALY): EVIDENCE FOR MAGMATIC DIFFERENTATION IN AN OPHIOLITIC SEQUENCE
Bibliographic record
Abstract
This work deals with the petrogenesis of a composite ophiolite body composed of gabbroic to plagiogranitic rocks. In particular, the sequence consists of evolved gabbros, Fe-gabbros and Fe-diorites crosscut by ferrobasaltic dikes and intruded by dikelets and lenses of plagiogranites, mainly represented by diorites and trondhjemites. Complex relationships among the different lithotypes indicate multiple melt injections into both crystal-mush and solidified rocks. Whole-rock compositions show continuously increasing FeO/(FeO + MgO) and increasing REE, Th, Nb, Y, LaN/SmN and Eu depletion from gabbros to plagiogranites. \nMajor and trace element variations and modelling show that the whole intrusive sequence originated from the differentiation of a ferrobasaltic magma reservoir. Ferrobasaltic liquid compositions are compatible with fractional crystallization of N-MOR type basalts through olivine + plagioclase + clinopyroxene removal, whereas the evolved gabbros represent clinopyroxene + plagioclase cumulates from ferrobasaltic liquids with small amounts of trapped melt. Fegabbroic to Fe-dioritic rocks, characterized by abundant Fe-Ti oxides + apatite as liquidus phases, likely represent cumulates from evolved liquids, possibly segregated from the gabbroic crystal-mush. The attainment of Fe-Ti oxide saturation promoted silica enrichment yielding residual liquids of dioritic composition which were segregated and injected into fractures of solidified gabbroic rocks or infiltrated into the Fe-gabbroic crystal-mush. Locally, silica-rich and slightly LREE-enriched liquids of trondhjemite composition were produced through fractionation of plagioclase + clinopyroxene + amphibole + Fe-Ti oxides (+ apatite + zircon + allanite).
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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 | 0.000 |
| 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 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".