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Fluid geochemistry of Nisyros island, Dodecanese, Greece

Identifieur interne : 000372 ( Main/Exploration ); précédent : 000371; suivant : 000373

Fluid geochemistry of Nisyros island, Dodecanese, Greece

Auteurs : G. Chiodini [Italie] ; R. Cioni [Italie] ; C. Leonis [Grèce] ; L. Marini [Italie] ; B. Raco [Italie]

Source :

RBID : ISTEX:46142D5CE80DFEAD2FE4A30834EEBDE158078384

Descripteurs français

English descriptors

Abstract

Abstract: Two distinct hydrothermal aquifers are present beneath the Lakki plain: (a) a deep aquifer, characterized by temperatures higher than 290°C and chloride-rich fluids: and (b) a shallow aquifer, with a chloride content close to that of sea water and temperatures in the range 170–255°C. The vapor phase boiled from the shallow aquifer feeds the fumarolic vents in the southern half of the Lakki plain and its liquid phase flows northeast and southwest, contributing to the thermal springs located along the northern and southern coasts of the island. This conceptual hydrogeochemical model of Nisyros Island can be used to reconstruct past hydrothermal eruptions and to estimate the risk of such events happening again in the future.

Url:
DOI: 10.1016/0377-0273(93)90052-S


Affiliations:


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Le document en format XML

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<term>Acetate solution</term>
<term>Acid gases</term>
<term>Acta</term>
<term>Analytical concentration</term>
<term>Analytical concentrations</term>
<term>Aqueous solution</term>
<term>Aquifer</term>
<term>Binary mixtures</term>
<term>Boreholes</term>
<term>Caldera</term>
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<term>Single step</term>
<term>Southern coasts</term>
<term>Southern half</term>
<term>Steam fraction</term>
<term>Steam phase</term>
<term>Steam separation</term>
<term>Steam tables</term>
<term>Stephanos crater</term>
<term>Summit caldera</term>
<term>Temperature values</term>
<term>Thermal spring pali</term>
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<term>Thermal waters</term>
<term>Thermal woters</term>
<term>Total discharge</term>
<term>Total pressure</term>
<term>Triangular diagrams</term>
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<term>Volcanic gases</term>
<term>aquifers</term>
<term>chlorine</term>
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<term>prediction</term>
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<term>Chlore</term>
<term>Circulation hydrothermale</term>
<term>Cratère</term>
<term>Départ gaz</term>
<term>Eau mer</term>
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<term>Eruption</term>
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<term>Grèce</term>
<term>Hydrochimie</term>
<term>Ile Nisyros</term>
<term>Iles Dodécanèse</term>
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<term>Nappe eau</term>
<term>Pression fluide</term>
<term>Prévision</term>
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<term>Binary mixtures</term>
<term>Boreholes</term>
<term>Caldera</term>
<term>Caldera fault</term>
<term>Carbon monoxide</term>
<term>Chemical characteristics</term>
<term>Chiodini</term>
<term>Chloride concentration</term>
<term>Chloride content</term>
<term>Chloride method</term>
<term>Cioni</term>
<term>Coast line</term>
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<term>Compositional pyramid</term>
<term>Conceptual hydrogeochemical model</term>
<term>Deep aquifer</term>
<term>Deep water</term>
<term>Depth interval</term>
<term>Discharge vapors</term>
<term>Distribution coefficient</term>
<term>Enthalpy</term>
<term>Equilibration zone</term>
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<term>Formation temperatures</term>
<term>Fumaroles</term>
<term>Fumarolic</term>
<term>Fumarolic discharges</term>
<term>Fumarolic effluents</term>
<term>Fumarolic fluids</term>
<term>Fumarolic vents</term>
<term>Further details</term>
<term>Gases equilibrate</term>
<term>Geobarometric evaluations</term>
<term>Geochemical survey</term>
<term>Geotermica italiana</term>
<term>Geothermal</term>
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<term>Geothermal exploration</term>
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<term>Natural waters</term>
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<term>Original temperature</term>
<term>Pali</term>
<term>Panaghias kiras</term>
<term>Partial pressure</term>
<term>Permeable zones</term>
<term>Preliminary test</term>
<term>Present hazard</term>
<term>Pressure method</term>
<term>Productive interval</term>
<term>Reasonable assumption</term>
<term>Salinity</term>
<term>Second hypothesis</term>
<term>Shallow aquifer</term>
<term>Shallow borehole</term>
<term>Shallow boreholes</term>
<term>Single step</term>
<term>Southern coasts</term>
<term>Southern half</term>
<term>Steam fraction</term>
<term>Steam phase</term>
<term>Steam separation</term>
<term>Steam tables</term>
<term>Stephanos crater</term>
<term>Summit caldera</term>
<term>Temperature values</term>
<term>Thermal spring pali</term>
<term>Thermal springs</term>
<term>Thermal waters</term>
<term>Thermal woters</term>
<term>Total discharge</term>
<term>Total pressure</term>
<term>Triangular diagrams</term>
<term>Vapor phase</term>
<term>Volcanic gases</term>
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<term>Eau souterraine</term>
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<front>
<div type="abstract" xml:lang="en">Abstract: Two distinct hydrothermal aquifers are present beneath the Lakki plain: (a) a deep aquifer, characterized by temperatures higher than 290°C and chloride-rich fluids: and (b) a shallow aquifer, with a chloride content close to that of sea water and temperatures in the range 170–255°C. The vapor phase boiled from the shallow aquifer feeds the fumarolic vents in the southern half of the Lakki plain and its liquid phase flows northeast and southwest, contributing to the thermal springs located along the northern and southern coasts of the island. This conceptual hydrogeochemical model of Nisyros Island can be used to reconstruct past hydrothermal eruptions and to estimate the risk of such events happening again in the future.</div>
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