Geochemical evidence for mixing of magmatic fluids with seawater, Nisyros hydrothermal system, Greece
Identifieur interne : 000187 ( Main/Exploration ); précédent : 000186; suivant : 000188Geochemical evidence for mixing of magmatic fluids with seawater, Nisyros hydrothermal system, Greece
Auteurs : Tatjana Brombach [Italie] ; Stefano Caliro [Italie] ; Giovanni Chiodini [Italie] ; Jens Fiebig [Suisse] ; Johannes C. Hunziker [Suisse] ; Brunella Raco [Italie]Source :
- Bulletin of volcanology [ 0258-8900 ] ; 2003.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Grèce.
- topic : Gaz rare, Eau, Interprétation.
English descriptors
- KwdEn :
Abstract
The chemical and isotopic compositions (δDH2O, δ18OH2O, δ18OCO2, δ13CCO2, δ34S, and He/N2 and He/Ar ratios) of fumarolic gases from Nisyros, Greece, indicate that both arc-type magmatic water and local seawater feed the hydrothermal system. Isotopic composition of the deep fluid is estimated to be +4.9±0.5‰ for δ18O and -11±5‰ for δD corresponding to a magmatic water fraction of 0.7. Interpretation of the stable water isotopes was based on liquid-vapor separation conditions obtained through gas geothermometry. The H2-Ar, H2-N2, and H2-H2O geothermometers suggest reservoir temperatures of 345±15 °C, in agreement with temperatures measured in deep geothermal wells, whereas a vapor/liquid separation temperature of 260±30 °C is indicated by gas equilibria in the H2O-H2-CO2-CO-CH4 system. The largest magmatic inputs seem to occur below the Stephanos-Polybotes Micros crater, whereas the marginal fumarolic areas of Phlegeton-Polybotes Megalos craters receive a smaller contribution of magmatic gases.
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Hunziker</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Institut de Minéralogie et Pétrographie, Université de Lausanne, BFSH2</s1><s2>Lausanne</s2><s3>CHE</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Suisse</country><placeName><settlement type="city">Lausanne</settlement><region nuts="3" type="region">Canton de Vaud</region></placeName><orgName type="university">Université de Lausanne</orgName></affiliation></author><author><name sortKey="Raco, Brunella" sort="Raco, Brunella" uniqKey="Raco B" first="Brunella" last="Raco">Brunella Raco</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Istituto di Geocronologia e Geochimica Isotopica, Area della Ricerca CNR, Via Alfieri 1, Ghezzano</s1><s2>Pisa</s2><s3>ITA</s3><sZ>6 aut.</sZ></inist:fA14><country>Italie</country><placeName><settlement type="city">Pise</settlement><region nuts="2">Toscane</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Bulletin of volcanology</title><title level="j" type="abbreviated">Bull. volcanol.</title><idno type="ISSN">0258-8900</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Bulletin of volcanology</title><title level="j" type="abbreviated">Bull. volcanol.</title><idno type="ISSN">0258-8900</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>C-13/C-12</term><term>D/H</term><term>Greece</term><term>Greek Aegean Islands</term><term>O-18/O-16</term><term>S-34/S-32</term><term>argon</term><term>composition</term><term>craters</term><term>fluid phase</term><term>fumaroles</term><term>hydrochemistry</term><term>hydrothermal circulation</term><term>interpretation</term><term>mixing</term><term>noble gases</term><term>reservoirs</term><term>separation</term><term>stable isotopes</term><term>temperature</term><term>water</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Grèce</term><term>Hydrochimie</term><term>Phase fluide</term><term>Circulation hydrothermale</term><term>Mixage</term><term>Composition</term><term>Argon</term><term>Gaz rare</term><term>Eau</term><term>Interprétation</term><term>Isotope stable</term><term>Séparation</term><term>Réservoir</term><term>Température</term><term>Cratère</term><term>Fumerolle</term><term>Iles Egée Grèce</term><term>O 18-O 16</term><term>C 13-C 12</term><term>D-H</term><term>S 34-S 32</term><term>Fluide magmatique</term><term>Ile Nisyros</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Grèce</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Gaz rare</term><term>Eau</term><term>Interprétation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The chemical and isotopic compositions (δD<sub>H2O</sub>, δ<sup>18</sup>O<sub>H2O</sub>, δ<sup>18</sup>O<sub>CO2</sub>, δ<sup>13</sup>C<sub>CO2</sub>, δ<sup>34</sup>S, and He/N<sub>2</sub> and He/Ar ratios) of fumarolic gases from Nisyros, Greece, indicate that both arc-type magmatic water and local seawater feed the hydrothermal system. Isotopic composition of the deep fluid is estimated to be +4.9±0.5‰ for δ<sup>18</sup>O and -11±5‰ for δD corresponding to a magmatic water fraction of 0.7. Interpretation of the stable water isotopes was based on liquid-vapor separation conditions obtained through gas geothermometry. The H<sub>2</sub>-Ar, H<sub>2</sub>-N<sub>2</sub>, and H<sub>2</sub>-H<sub>2</sub>O geothermometers suggest reservoir temperatures of 345±15 °C, in agreement with temperatures measured in deep geothermal wells, whereas a vapor/liquid separation temperature of 260±30 °C is indicated by gas equilibria in the H<sub>2</sub>O-H<sub>2</sub>-CO<sub>2</sub>-CO-CH<sub>4</sub> system. The largest magmatic inputs seem to occur below the Stephanos-Polybotes Micros crater, whereas the marginal fumarolic areas of Phlegeton-Polybotes Megalos craters receive a smaller contribution of magmatic gases.</div></front></TEI><affiliations><list><country><li>Italie</li><li>Suisse</li></country><region><li>Canton de Vaud</li><li>Toscane</li></region><settlement><li>Lausanne</li><li>Pise</li></settlement><orgName><li>Université de Lausanne</li></orgName></list><tree><country name="Italie"><noRegion><name sortKey="Brombach, Tatjana" sort="Brombach, Tatjana" uniqKey="Brombach T" first="Tatjana" last="Brombach">Tatjana Brombach</name></noRegion><name sortKey="Caliro, Stefano" sort="Caliro, Stefano" uniqKey="Caliro S" first="Stefano" last="Caliro">Stefano Caliro</name><name sortKey="Chiodini, Giovanni" sort="Chiodini, Giovanni" uniqKey="Chiodini G" first="Giovanni" last="Chiodini">Giovanni Chiodini</name><name sortKey="Raco, Brunella" sort="Raco, Brunella" uniqKey="Raco B" first="Brunella" last="Raco">Brunella Raco</name></country><country name="Suisse"><region name="Canton de Vaud"><name sortKey="Fiebig, Jens" sort="Fiebig, Jens" uniqKey="Fiebig J" first="Jens" last="Fiebig">Jens Fiebig</name></region><name sortKey="Hunziker, Johannes C" sort="Hunziker, Johannes C" uniqKey="Hunziker J" first="Johannes C." last="Hunziker">Johannes C. 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