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Relationships between Campi Flegrei and Mt. Somma volcanism: evidence from melt inclusions in clinopyroxene phenocrysts from volcanic breccia xenoliths
Danyushevsky, LV and Lima, A (2001) Relationships between Campi Flegrei and Mt. Somma volcanism: evidence from melt inclusions in clinopyroxene phenocrysts from volcanic breccia xenoliths. Mineralogy and Petrology, 73 (1-3). pp. 107-119. ISSN 0930-0708
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We present compositions of reheated melt inclusions in clinopyroxene phenocrysts from three mafic xenoliths in Breccia Museo, Campi Flegrei, Italy. Melt inclusion compositions are remarkably different from the compositions of known contemporary Campi Flegrei lavas, being significantly enriched in K2O and depleted in Na2O. Some differences are also evident in FeO (total Fe as FeO) and TiO2 contents. The clinopyroxene phenocrysts could not have crystallised from Campi Flegrei magmas. We suggest that they originated from a volcanic system genetically very similar to, and possibly linked with, the > 14 ka volcanic system of Mt. Somma, another Campanian volcano ~30km east from Campi Flegrei, from which Vesuvius subsequently developed. This result indicates a close relationship (or link) between the two volcanic systems which have until now been considered separate. We speculate that the link was established prior to eruption of the Neapolitan Yellow Tuff (NYT) (~12 ka). The xenoliths were derived from a volcanic system older than the host breccias themselves. We suggest that this older volcanism had close similarities with the volcanism of the older products of Mt. Somma (~25 ka).
|Keywords:||melt inclusions, clinopyroxene, Italy, Roman Province, Vesuvius|
|Journal or Publication Title:||Mineralogy and Petrology|
|Page Range:||pp. 107-119|
|Identification Number - DOI:||10.1007/s007100170013|
|Additional Information:||The original publication is available at www.springerlink.com|
|Date Deposited:||11 Oct 2007 04:55|
|Last Modified:||18 Nov 2014 03:23|
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