Components and processes in the magma genesis of the Phlegrean Volcanic District, southern Italy

D'ANTONIO, MASSIMO and CIVETTA, LUCIA (2007) Components and processes in the magma genesis of the Phlegrean Volcanic District, southern Italy. In: Cenozoic volcanism in the mediterranean area. Geological Society of America, Boulder, Colorado, pp. 203-220. ISBN 9780813724188

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Abstract

Sr-Nd-Pb-B isotope and incompatible trace element investigations were carried out on volcanics of the Phlegrean Volcanic District, which includes Campi Flegrei and the islands of Ischia and Procida (Campanian region, southern Italy). The results of these investigations allowed us to define several components in the genesis of magmas, including transitional mid-ocean-ridge basalt (MORB)–type asthenospheric mantle, aqueous fl uids, oceanic sediment melts derived from the subducted Ionian slab, and continental crust. A source contamination process that introduces variable proportions of slab-derived components into the mantle can explain the observed isotopic variations among the products of Ischia and Procida, and of Campi Flegrei older than 39 ka. Furthermore, comparison between Phlegrean Volcanic District and Aeolian arc volcanic rocks shows a different role of aqueous fluids and sediment melts from southeast to northwest. Energy-constrained assimilation and fractional crystallization modeling suggests that younger than 39 ka Campi Flegrei potassic trachybasalt magmas could have assimilated up to 2% of crustal melt, while evolving to trachyte during stagnation at ~8 km depth. Crustal assimilation and mixing/mingling processes among isotopically distinct magma batches at shallower depth account for geochemical and isotopic variations of younger than 39 ka Campi Flegrei volcanic rocks.

Tipologia di documento:Contributo in monografia
Parole chiave:Phlegrean Volcanic District, isotope geochemistry, trace element geochemistry, source contamination, crustal assimilation
Settori scientifico-disciplinari MIUR:Non specificato
Stato del full text:Accessibilità ristretta
Data:2007
Altri Autori:D'Antonio M., Tonarini S., Arienzo I., Civetta L., Di Renzo V.
Editore:Geological Society of America
Luogo di pubblicazione:Boulder, Colorado
Numero di pagine:0
Intervallo di pagina:pp. 203-220
Volume:418
URL:www.geosociety.org
Dipartimento o Struttura:Dipartimento di Scienze Fisiche
ISBN:9780813724188
Numero identificativo:10.1130/2007.2418(10)
Numero di sistema:5736
Depositato il:18 Ottobre 2010 10:33
Ultima modifica:18 Ottobre 2010 10:33

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