http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29838

Water-rock interaction in the magmatic-hydrothermal system of Nisyros Island (Greece). (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Water-rock interaction in the magmatic-hydrothermal system of Nisyros Island (Greece). (Articolo in rivista) (literal)

Anno

2010-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.jvolgeores.2010.02.005 (literal)

Alternative label

Ambrosio M.; Doveri M.; Fagioli M.T.; Marini L.; Principe C.; Raco B. (2010)
Water-rock interaction in the magmatic-hydrothermal system of Nisyros Island (Greece).
in Journal of volcanology and geothermal research
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Ambrosio M.; Doveri M.; Fagioli M.T.; Marini L.; Principe C.; Raco B. (literal)

Pagina inizio

57 (literal)

Pagina fine

68 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.journals.elsevier.com/journal-of-volcanology-and-geothermal-research/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

192 (literal)

Rivista

Journal of volcanology and geothermal research (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

In: Journal of Volcanology and Geothermal Research, vol. 192 (1-2) pp. 57 - 68. Elsevier, 2010. (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

AF Geoscience and Technology Consulting, via Toniolo 222, Campo (PI), 56010, Italy Institute of Geosciences and Georesources, CNR, Area della Ricerca, Via G. Moruzzi 1, I-56124 Pisa, Italy Laboratory of Geochemistry, Dip.Te.Ris., University of Genova, Corso Europa 26, I-16132 Genova, Italy (literal)

Titolo

Water-rock interaction in the magmatic-hydrothermal system of Nisyros Island (Greece). (literal)

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 1547m (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 1360m, 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. The temperature dependence of analytically-derived pH values for the reservoir liquids feeding the fumarolic vents of Stephanos and Polybote Micros craters suggests that some unspecified pH buffer fixes the acidity (literal)

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