NissirosV1, Main, Exploration, bibRecord, 000256

Isotope and chemical studies for a geothermal assessment of the island of Nisyros (Greece)

Identifieur interne : 000256 ( Main/Exploration ); précédent : 000255; suivant : 000257

Isotope and chemical studies for a geothermal assessment of the island of Nisyros (Greece)

Auteurs : T. Kavouridis [Grèce] ; D. Kuris [Grèce] ; C. Leonis [Grèce] ; V. Liberopoulou [Grèce] ; J. Leontiadis [Grèce] ; C. Panichi [Italie] ; G. L. Ruffa [Italie] ; A. Caprai [Italie]

Source :

Geothermics [ 0375-6505 ] ; 1999.

RBID : Pascal:99-0311187

Descripteurs français

Pascal (Inist)
- Nappe eau, Circulation hydrothermale, Arc insulaire, Composition isotopique, Géothermométrie, Puits eau, Puits géothermique, Phase gazeuse, Modèle, Ile Nisyros, Eau mer, Interaction fluide roche, Fumerolle.

English descriptors

KwdEn :
- Aquifers, Fumaroles, Gas phase, Geothermal well, Geothermometry, Island arc, Isotopic composition, Models, Seawater, Water well, fluid-rock interaction, hydrothermal circulation.

Abstract

Two distinct hydrothermal aquifers occur beneath the volcanic crater. The deeper one is characterised by temperatures above 330°C and a chemical and isotopic composition in agreement with a thermal modification of seawater by water/rock interaction and boiling processes at depth. The shallow aquifer has temperatures below 170°C and salt content and isotopic composition between those of seawater and local groundwaters. The steam produced at the caldera rim (Kaminakia group) has a δD and δ¹⁸O of -42‰ and -6.1‰, respectively, whereas the steam produced inside the caldera (Stephanos and Polybotes group) exhibits average δ values of -11‰ and +2.5‰ for D and ¹⁸O, respectively. Such values are indicative of different parent waters for the above two aquifers. The isotope geothermometers based on the pairs (CH₄-H₂), (H₂O-H₂) and (CH₄-CO₂) from the same fumaroles yield values consistently within the 100-350°C range.

Affiliations:

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Le document en format XML

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<author><name sortKey="Liberopoulou, V" sort="Liberopoulou, V" uniqKey="Liberopoulou V" first="V." last="Liberopoulou">V. Liberopoulou</name>
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<author><name sortKey="Ruffa, G L" sort="Ruffa, G L" uniqKey="Ruffa G" first="G. L." last="Ruffa">G. L. Ruffa</name>
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<s2>56126 Pisa</s2>
<s3>ITA</s3>
<sZ>6 aut.</sZ>
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<author><name sortKey="Caprai, A" sort="Caprai, A" uniqKey="Caprai A" first="A." last="Caprai">A. Caprai</name>
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<s2>56126 Pisa</s2>
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<series><title level="j" type="main">Geothermics</title>
<title level="j" type="abbreviated">Geothermics</title>
<idno type="ISSN">0375-6505</idno>
<imprint><date when="1999">1999</date>
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<idno type="ISSN">0375-6505</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aquifers</term>
<term>Fumaroles</term>
<term>Gas phase</term>
<term>Geothermal well</term>
<term>Geothermometry</term>
<term>Island arc</term>
<term>Isotopic composition</term>
<term>Models</term>
<term>Seawater</term>
<term>Water well</term>
<term>fluid-rock interaction</term>
<term>hydrothermal circulation</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Nappe eau</term>
<term>Circulation hydrothermale</term>
<term>Arc insulaire</term>
<term>Composition isotopique</term>
<term>Géothermométrie</term>
<term>Puits eau</term>
<term>Puits géothermique</term>
<term>Phase gazeuse</term>
<term>Modèle</term>
<term>Ile Nisyros</term>
<term>Eau mer</term>
<term>Interaction fluide roche</term>
<term>Fumerolle</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Two distinct hydrothermal aquifers occur beneath the volcanic crater. The deeper one is characterised by temperatures above 330°C and a chemical and isotopic composition in agreement with a thermal modification of seawater by water/rock interaction and boiling processes at depth. The shallow aquifer has temperatures below 170°C and salt content and isotopic composition between those of seawater and local groundwaters. The steam produced at the caldera rim (Kaminakia group) has a δD and δ<sup>18</sup>
O of -42‰ and -6.1‰, respectively, whereas the steam produced inside the caldera (Stephanos and Polybotes group) exhibits average δ values of -11‰ and +2.5‰ for D and <sup>18</sup>
O, respectively. Such values are indicative of different parent waters for the above two aquifers. The isotope geothermometers based on the pairs (CH<sub>4</sub>
-H<sub>2</sub>
), (H<sub>2</sub>
O-H<sub>2</sub>
) and (CH<sub>4</sub>
-CO<sub>2</sub>
) from the same fumaroles yield values consistently within the 100-350°C range.</div>
</front>
</TEI>
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<li>Italie</li>
</country>
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<li>Toscane</li>
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<settlement><li>Athènes</li>
<li>Pise</li>
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<tree><country name="Grèce"><region name="Attique (région)"><name sortKey="Kavouridis, T" sort="Kavouridis, T" uniqKey="Kavouridis T" first="T." last="Kavouridis">T. Kavouridis</name>
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<name sortKey="Kuris, D" sort="Kuris, D" uniqKey="Kuris D" first="D." last="Kuris">D. Kuris</name>
<name sortKey="Leonis, C" sort="Leonis, C" uniqKey="Leonis C" first="C." last="Leonis">C. Leonis</name>
<name sortKey="Leontiadis, J" sort="Leontiadis, J" uniqKey="Leontiadis J" first="J." last="Leontiadis">J. Leontiadis</name>
<name sortKey="Liberopoulou, V" sort="Liberopoulou, V" uniqKey="Liberopoulou V" first="V." last="Liberopoulou">V. Liberopoulou</name>
</country>
<country name="Italie"><region name="Toscane"><name sortKey="Panichi, C" sort="Panichi, C" uniqKey="Panichi C" first="C." last="Panichi">C. Panichi</name>
</region>
<name sortKey="Caprai, A" sort="Caprai, A" uniqKey="Caprai A" first="A." last="Caprai">A. Caprai</name>
<name sortKey="Ruffa, G L" sort="Ruffa, G L" uniqKey="Ruffa G" first="G. L." last="Ruffa">G. L. Ruffa</name>
</country>
</tree>
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</record>

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Isotope and chemical studies for a geothermal assessment of the island of Nisyros (Greece)

Isotope and chemical studies for a geothermal assessment of the island of Nisyros (Greece)

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri