When and where did hybridization occur? The case of the Monte Capanne Pluton, Italy
Bibliographic record
Abstract
The Monte Capanne pluton was emplaced during the Late Miocene in a post-collision extensional regime that generated the Tuscan Magmatic Province as the Adriatic (lower) plate underwent progressive crustal delamination. This dominantly monzogranitic pluton, generated by hybridization between mantle and crustal magmas, consists of mappable facies; end members range from less hybridized with high concentrations of very coarse K-feldspar megacrysts and abundant mafic microgranular enclaves, to more hybridized with low megacryst and enclave abundances. K-feldspar megacrysts from Monte Capanne and other related units of the province, along with their inclusions and associated late mineral phases, preserve evidence of chemical and 87Sr/86Sr disequilibrium (first rising and then falling) during evolution of the system. The concomitant occurrence of contrasting reaction microtextures in accessory phases in this anatectic-hybrid pluton, particularly involving monazite-(Ce), also suggests transient chemical conditions. The ubiquitous mafic microgranular enclaves, typically with high concentrations of xenocrysts from Monte Capanne magma, provide evidence of a highly dynamic system involving vigorous interaction between mafic and felsic magmas. The data suggest that rapid dehydration melting, driven by intrusions of fractionating mantle-derived magma near the base of the crust, was followed by magma mixing and K-feldspar megacryst growth. Segregation and ascent produced the hybridized products now observed at the emplacement level. RÉSUMÉ L'intrusion du pluton du mont Capanne est survenue au cours du Miocène tardif dans un régime d'extension de post-collision ayant produit la province magmatique de Toscane au fur et à mesure que la plaque (inférieure) de l'Adriatique a subi une delamination crustale progressive. Ces plutons principalement monzogranitiques, produits par hybridation entre les magmas mantéliques et crustaux, sont constitués de faciès cartographiables; les membres d'extrémité varient des membres peu hybridés renfermant de fortes concentrations de mégacristaux de feldspath potassique très grossiers et d'enclaves microgranulaires mafiques abondantes à des membres plus hybridés comportant de faibles abondances d'enclaves et de mégacristaux. Les mégacristaux de feldspath potassique du mont Capanne et des autres unités apparentés de la province, de même que leurs inclusions et leurs phases minérales tardives associées, préservent les indices d'un déséquilibre chimique et de 87Sr/86Sr (d'abord hausse, puis baisse) pendant l'évolution du système. La présence concomitante de microtextures à réactions opposées au cours de phases accessoires dans ce pluton anatectique-hybride, mettant en scène en particulier de la monazite-(Ce), permet par ailleurs de supposer des conditions chimiques transitoires. Les enclaves microgranulaires mafiques ubiquistes, présentant généralement des concentrations élevées de xénocristaux du magma du mont Capanne, témoignent d'un système extrêmement dynamique présentant une interaction prononcée entre les magmas mafiques et felsiques. Les données laissent supposer qu'une fusion à déshydratation rapide, animée par les intrusions de magma mantélique s'étant fractionné près de la base de la croûte, a été suivie d'un mixage de magma et de la croissance de mégacristaux de feldspath potassique. La ségrégation et l'ascension magmatiques ont fourni les produits hybridés maintenant observés au niveau de l'intrusion. [Traduit par la rédaction]
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.003 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
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".