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Authors: D’Antonio, M.*
Tonarini, S.*
Arienzo, L.*
Civetta, L.*
Di Renzo, V.*
Title: Components and processes in the magma genesis of the Phlegrean Volcanic District, southern Italy
Title of journal: Geological Society of America Bulletin Special Paper
Series/Report no.: /418 (2006)
Publisher: Geological Society of America
Issue Date: 2006
Keywords: Phlegrean Volcanic District
isotope geochemistry
trade element geochemistry
source contamination
crustal assimilation.
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 defi ne 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 fl uids 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.
Appears in Collections:Papers Published / Papers in press
04.08.03. Magmas
04.08.05. Volcanic rocks
04.04.05. Mineralogy and petrology

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