Abstract
The Vico volcanic series, similarly to the most basic rocks of the Roman and Tuscan Magmatic Provinces, show isotopic compositions that are typical of crust-derived material. This isotopic signature was likely acquired from an anomalous mantle source, strongly modified by the interaction with fluids and melts released by a subducted slab(s). By contrast, fractionation and assimilation processes at low pressure in the local continental crust appear to have played a secondary role even in the petrogenesis of the most evolved Vico volcanics. The achievement of a steady state and subsequent disequilibria of the Vico volcanic system could be related to the geodynamic history of the internal sector of the Apennines at Pleistocene time.
Riassunto
Così come quelle dei prodotti più basici della Provincia Magmatica Romana (PMR) e della Provincia Magmatica Toscana (PMT), le composizioni isotopiche dei magmi appartenenti alla serie evolutiva vicana mostrano significative similitudini con quelle tipiche della crosta continentale e sono da ricondurre essenzialmente alla loro sorgente mantellica, modificata da eventi di subduzione. Viceversa, i fenomeni di differenziazione ed assimilazione dell’incassante avvenuti a bassa pressione risultano aver giocato un ruolo secondario nella petrogenesi delle lave di Vico. L’evoluzione del sistema vulcanico vicano, dal raggiungimento di uno stato stazionario al successivo disequilibrio che porta allo svuotamento delle camere magmatiche e ai ripetuti collassi calderici, risulta strettamente legata alla geodinamica estensionale pleistocenica del settore interno dell’Appennino.
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Nella seduta del 19 giugno 2003.
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Gasperini, D. Il ruolo dei processi a bassa pressione nella petrogenesi del magmatismo pleistocenico della Provincia Magmatica Romana: dati isotopici preliminari sul vulcano di Vico. Rend. Fis. Acc. Lincei 14, 161–177 (2003). https://doi.org/10.1007/BF02904522
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DOI: https://doi.org/10.1007/BF02904522