Chemical and isotopical characterisation of fluid manifestations of Ischia Island (Italy)
Language
English
Obiettivo Specifico
6V. Pericolosità vulcanica e contributi alla stima del rischio
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Issue/vol(year)
/99 (2000)
ISSN
0377-0273
Electronic ISSN
1872-6097
Publisher
Elsevier Science Limited
Pages (printed)
151-178
Date Issued
2000
Subjects
Abstract
Between 1994 and 1995, gas samples from fumaroles and thermal waters were collected on Ischia Island. The chemical
composition of the shallow and deep natural hydrothermal fluids discharged is related to the main hydrological and lithological
characteristics of the rock formations present in the reservoir. A biphase reservoir (liquid 1 gas) is identified, where the
dominant liquid has a temperature of about 2808C. On the basis of d 13CTDC values it was possible to hypothesize a deep source
characterised by carbon isotopic values varying from 0 to 23d‰. These values are noticeably more positive with respect to
those attributed to magmatic CO2 d13CCO2 ranging from 25 to 28d ‰), thus suggesting a magmatic source modified by crustal
contamination. This hypothesis is supported by the carbon isotopic composition of CO2 in sampled gases, which varied from 0
to 25d‰. The inferred isotopic value of carbon of magmatic CO2 would then be about 22d‰. The observed differences in C
isotopic composition between fumarolic and magmatic gases would be caused by kinetic and/or equilibrium fractionation
processes. These processes would cause a fractionation of d 13C of deep CO2 towards more negative values (down to 25‰).
Actually, CO2 removal or addition processes caused by the interaction between deep gases and shallow hydrothermal waters are
likely to be responsible for the different chemical and isotopic compositions of gaseous emissions. For these reasons, and on the
basis of the homogeneity of geothermometric values, the existence of a single, large reservoir that feeds all of the fluids
discharged at Ischia Island can be hypothesised. Based on acquired data, a new geochemical model of the geothermal system of
Ischia Island is proposed.
composition of the shallow and deep natural hydrothermal fluids discharged is related to the main hydrological and lithological
characteristics of the rock formations present in the reservoir. A biphase reservoir (liquid 1 gas) is identified, where the
dominant liquid has a temperature of about 2808C. On the basis of d 13CTDC values it was possible to hypothesize a deep source
characterised by carbon isotopic values varying from 0 to 23d‰. These values are noticeably more positive with respect to
those attributed to magmatic CO2 d13CCO2 ranging from 25 to 28d ‰), thus suggesting a magmatic source modified by crustal
contamination. This hypothesis is supported by the carbon isotopic composition of CO2 in sampled gases, which varied from 0
to 25d‰. The inferred isotopic value of carbon of magmatic CO2 would then be about 22d‰. The observed differences in C
isotopic composition between fumarolic and magmatic gases would be caused by kinetic and/or equilibrium fractionation
processes. These processes would cause a fractionation of d 13C of deep CO2 towards more negative values (down to 25‰).
Actually, CO2 removal or addition processes caused by the interaction between deep gases and shallow hydrothermal waters are
likely to be responsible for the different chemical and isotopic compositions of gaseous emissions. For these reasons, and on the
basis of the homogeneity of geothermometric values, the existence of a single, large reservoir that feeds all of the fluids
discharged at Ischia Island can be hypothesised. Based on acquired data, a new geochemical model of the geothermal system of
Ischia Island is proposed.
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