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Eruptive history of Neapolitan volcanoes: constraints from 40Ar–39Ar dating

Published online by Cambridge University Press:  31 October 2012

CLAUDIO SCARPATI ,
ANNAMARIA PERROTTA ,
SIMONE LEPORE  and
ANDREW CALVERT
CLAUDIO SCARPATI*
Affiliation:
Dipartimento di Scienze della Terra, University of Naples ‘Federico II’, Largo San Marcellino 10, 80138 Napoli, Italy
ANNAMARIA PERROTTA
Affiliation:
Dipartimento di Scienze della Terra, University of Naples ‘Federico II’, Largo San Marcellino 10, 80138 Napoli, Italy
SIMONE LEPORE
Affiliation:
Dipartimento di Scienze della Terra, University of Naples ‘Federico II’, Largo San Marcellino 10, 80138 Napoli, Italy
ANDREW CALVERT
Affiliation:
US Geological Survey, Laboratory of Menlo Park, California, USA
*
†Author for correspondence: claudio.scarpati@unina.it
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Abstract

The city of Naples can be considered part of the Campi Flegrei volcanic field, and deposits within the urban area record many autochthonous pre- to post-caldera eruptions. Age measurements were carried out using 40Ar–39Ar dating techniques on samples from small monogenetic vents and more widely distributed tephra layers. The 40Ar–39Ar ages on feldspar phenocrysts yielded ages of c. 16 ka and 22 ka for events older than the Neapolitan Yellow Tuff caldera-forming eruption (15 ka), and ages of c. 40 ka, 53 ka and 78 ka for events older than the Campanian Ignimbrite caldera-forming eruption (39 ka). The oldest age obtained is 18 ka older than previous dates for pyroclastic deposits cropping out along the northern rim of Campi Flegrei. The results of this study allow us to divide the Campi Flegrei volcanic history into four main, geochronologically distinct eruptive cycles. A new period, the Paleoflegrei, occurred before 74–78 ka and has been proposed to better discriminate the ancient volcanism in the volcanic field. The eruptive history of Campi Flegrei extends possibly further back than this, but the products of previous eruptions are difficult to date owing to the lack of fresh juvenile clasts. These new geochronological data, together with recently published ages related to young volcanic edifices located in the city of Naples (Nisida volcano, 3.9 ka) testify to persistent activity over a period of at least 80 ka, with an average eruption recurrence interval of ~555 years within and adjacent to this densely populated city.

Keywords

Neapolitan volcanism40Ar–39Ar age determinationsCampi Flegrei evolutionPaleoflegrei
Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 3 , May 2013 , pp. 412 - 425
Copyright
Copyright © Cambridge University Press 2012

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