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Journal of the Geological Society; December 2009; v. 166; no. 6; p. 1061-1073; DOI: 10.1144/0016-76492009-030
© 2009 Geological Society of London
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Research Article

Exhumation of an active magmatic–hydrothermal system in a resurgent caldera environment: the example of Ischia (Italy)

A. Sbrana1, P. Fulignati1, P. Marianelli1, A.J. Boyce2 and A. Cecchetti1

1 Dipartimento di Scienze della Terra, Università degli Studi di Pisa, via Santa Maria, 53, 56126 Pisa, Italy
2 Stable Isotope Unit, Scottish Universities Environmental Research Centre, East Kilbride, Glasgow G75 0QF, UK

*Corresponding author (e-mail: fulignati{at}dst.unipi.it)

Ischia is a rare case of a well-exposed caldera system that has experienced rapid recent resurgence, which can be used to dissect the anatomy of an otherwise inaccessible active hydrothermal system developed in a caldera-forming environment. Integrated analyses of melt and fluid inclusions, mineralogy and stable isotopic compositions of pumices, tuffs and syenitic xenoliths of the Ischia volcanic system provide strong physico-chemical constraints on the shallow magmatic reservoir and the hydrothermal system. The hydrothermal system has been exposed by the rapid uplift of the Mt. Epomeo resurgent block. The engine of the hydrothermal system of Ischia can be identified in the shallow magmatic system (at around 2 km depth) that hosts hot (c. 1000 °C) trachytic magma. The hydrothermal system developed principally within thick intracaldera ignimbrite deposits, and extended to a depth of at least 1 km, defining a series of facies characterized by associations of alteration mineral assemblages typical of a seawater-dominated high-temperature geothermal system.

Supplementary material: Sample descriptions and analytical methods are available at http://www.geolsoc.org.uk/SUP18371.






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
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