Water-rock interaction in the magmatic-hydrothermal system of Nisyros Island (Greece)
Identifieur interne : 000082 ( Main/Exploration ); précédent : 000081; suivant : 000083Water-rock interaction in the magmatic-hydrothermal system of Nisyros Island (Greece)
Auteurs : Michele Ambrosio [Italie] ; Marco Doveri [Italie] ; Maria Teresa Fagioli [Italie] ; Luigi Marini [Italie] ; Claudia Principe [Italie] ; Brunella Raco [Italie]Source :
- Journal of volcanology and geothermal research [ 0377-0273 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Grèce.
- topic : Minéralogie.
English descriptors
- KwdEn :
Abstract
In this work, we investigated the water-rock interaction processes taking place in the hydrothermal reservoir of Nisyros through both: (1) a review of the hydrothermal mineralogy encountered in the deep geothermal borehole Nisyros-2; and (2) a comparison of the analytically-derived redox potentials and acidities of fumarolic-related liquids, with those controlled by redox buffers and pH buffers, involving hydrothermal mineral phases. The propylitic zone met in the deep geothermal borehole Nisyros-2, from 950 to 1547 m (total depth), is characterised by abundant, well crystallised epidote, adularia, albite, quartz, pyrite, chlorite, and sericite-muscovite, accompanied by less abundant anhydrite, stilpnomelane, wairakite, garnet, tremolite and pyroxene. These hydrothermal minerals were produced in a comparatively wide temperature range, from 230 to 300 °C, approximately. Hydrothermal assemblages are well developed from 950 to 1360 m, whereas they are less developed below this depth, probably due to low permeability. Based on the RH values calculated for fumarolic gases and for the deep geothermal fluids of Nisyros-1 and Nisyros-2 wells, redox equilibrium with the (FeO)/(FeO1.5) rock buffer appears to be closely attained throughout the hydrothermal reservoir of Nisyros. This conclusion may be easily reconciled with the nearly ubiquitous occurrence of anhydrite and pyrite, since RH values controlled by coexistence of anhydrite and pyrite can be achieved by gas separation. The pH of the liquids feeding the fumarolic vents of Stephanos and Polybote Micros craters was computed, by means of the EQ3 code, based on the Cl-δD relationship which is constrained by the seawater-magmatic water mixing occurring at depth in the hydrothermal-magmatic system of Nisyros.
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The propylitic zone met in the deep geothermal borehole Nisyros-2, from 950 to 1547 m (total depth), is characterised by abundant, well crystallised epidote, adularia, albite, quartz, pyrite, chlorite, and sericite-muscovite, accompanied by less abundant anhydrite, stilpnomelane, wairakite, garnet, tremolite and pyroxene. These hydrothermal minerals were produced in a comparatively wide temperature range, from 230 to 300 °C, approximately. Hydrothermal assemblages are well developed from 950 to 1360 m, whereas they are less developed below this depth, probably due to low permeability. Based on the R<sub>H</sub> values calculated for fumarolic gases and for the deep geothermal fluids of Nisyros-1 and Nisyros-2 wells, redox equilibrium with the (FeO)/(FeO<sub>1.5</sub>) rock buffer appears to be closely attained throughout the hydrothermal reservoir of Nisyros. This conclusion may be easily reconciled with the nearly ubiquitous occurrence of anhydrite and pyrite, since R<sub>H</sub> values controlled by coexistence of anhydrite and pyrite can be achieved by gas separation. The pH of the liquids feeding the fumarolic vents of Stephanos and Polybote Micros craters was computed, by means of the EQ3 code, based on the Cl-δD relationship which is constrained by the seawater-magmatic water mixing occurring at depth in the hydrothermal-magmatic system of Nisyros.</div></front></TEI><affiliations><list><country><li>Italie</li></country><region><li>Toscane</li></region><settlement><li>Pise</li></settlement></list><tree><country name="Italie"><noRegion><name sortKey="Ambrosio, Michele" sort="Ambrosio, Michele" uniqKey="Ambrosio M" first="Michele" last="Ambrosio">Michele Ambrosio</name></noRegion><name sortKey="Doveri, Marco" sort="Doveri, Marco" uniqKey="Doveri M" first="Marco" last="Doveri">Marco Doveri</name><name sortKey="Fagioli, Maria Teresa" sort="Fagioli, Maria Teresa" uniqKey="Fagioli M" first="Maria Teresa" last="Fagioli">Maria Teresa Fagioli</name><name sortKey="Marini, Luigi" sort="Marini, Luigi" uniqKey="Marini L" first="Luigi" last="Marini">Luigi Marini</name><name sortKey="Marini, Luigi" sort="Marini, Luigi" uniqKey="Marini L" first="Luigi" last="Marini">Luigi Marini</name><name sortKey="Principe, Claudia" sort="Principe, Claudia" uniqKey="Principe C" first="Claudia" last="Principe">Claudia Principe</name><name sortKey="Raco, Brunella" sort="Raco, Brunella" uniqKey="Raco B" first="Brunella" last="Raco">Brunella Raco</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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