Vein networks in hydrothermal systems provide constraints for the monitoring of active volcanoes
Identifieur interne : 000000 ( Main/Exploration ); suivant : 000001Vein networks in hydrothermal systems provide constraints for the monitoring of active volcanoes
Auteurs : Luigi Cucci [Italie] ; Francesca Di Luccio [Italie] ; Alessandra Esposito [Italie] ; Guido Ventura [Italie]Source :
- Scientific Reports [ 2045-2322 ] ; 2017.
Abstract
Vein networks affect the hydrothermal systems of many volcanoes, and variations in their arrangement may precede hydrothermal and volcanic eruptions. However, the long-term evolution of vein networks is often unknown because data are lacking. We analyze two gypsum-filled vein networks affecting the hydrothermal field of the active Lipari volcanic Island (Italy) to reconstruct the dynamics of the hydrothermal processes. The older network (E1) consists of sub-vertical, N-S striking veins; the younger network (E2) consists of veins without a preferred strike and dip. E2 veins have larger aperture/length, fracture density, dilatancy, and finite extension than E1. The fluid overpressure of E2 is larger than that of E1 veins, whereas the hydraulic conductance is lower. The larger number of fracture intersections in E2 slows down the fluid movement, and favors fluid interference effects and pressurization. Depths of the E1 and E2 hydrothermal sources are 0.8 km and 4.6 km, respectively. The decrease in the fluid flux, depth of the hydrothermal source, and the pressurization increase in E2 are likely associated to a magma reservoir. The decrease of fluid discharge in hydrothermal fields may reflect pressurization at depth potentially preceding hydrothermal explosions. This has significant implications for the long-term monitoring strategy of volcanoes.
Url:
DOI: 10.1038/s41598-017-00230-8
PubMed: 28273951
PubMed Central: 5428009
Affiliations:
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type="main">Vein networks in hydrothermal systems provide constraints for the monitoring of active volcanoes</title><author><name sortKey="Cucci, Luigi" sort="Cucci, Luigi" uniqKey="Cucci L" first="Luigi" last="Cucci">Luigi Cucci</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy</nlm:aff><country xml:lang="fr">Italie</country><wicri:regionArea>Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma</wicri:regionArea><placeName><settlement type="city">Rome</settlement><region nuts="2">Latium</region></placeName></affiliation></author><author><name sortKey="Di Luccio, Francesca" sort="Di Luccio, Francesca" uniqKey="Di Luccio F" first="Francesca" last="Di Luccio">Francesca Di Luccio</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy</nlm:aff><country 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However, the long-term evolution of vein networks is often unknown because data are lacking. We analyze two gypsum-filled vein networks affecting the hydrothermal field of the active Lipari volcanic Island (Italy) to reconstruct the dynamics of the hydrothermal processes. The older network (E1) consists of sub-vertical, N-S striking veins; the younger network (E2) consists of veins without a preferred strike and dip. E2 veins have larger aperture/length, fracture density, dilatancy, and finite extension than E1. The fluid overpressure of E2 is larger than that of E1 veins, whereas the hydraulic conductance is lower. The larger number of fracture intersections in E2 slows down the fluid movement, and favors fluid interference effects and pressurization. Depths of the E1 and E2 hydrothermal sources are 0.8 km and 4.6 km, respectively. The decrease in the fluid flux, depth of the hydrothermal source, and the pressurization increase in E2 are likely associated to a magma reservoir. The decrease of fluid discharge in hydrothermal fields may reflect pressurization at depth potentially preceding hydrothermal explosions. This has significant implications for the long-term monitoring strategy of volcanoes.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Miller, S" uniqKey="Miller S">S Miller</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Virgo, S" uniqKey="Virgo S">S Virgo</name></author><author><name sortKey="Abe, S" uniqKey="Abe S">S Abe</name></author><author><name sortKey="Urai, J" uniqKey="Urai J">J Urai</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Sparks, Rsj" uniqKey="Sparks R">RSJ Sparks</name></author><author><name sortKey="Biggs, J" uniqKey="Biggs J">J Biggs</name></author><author><name sortKey="Neuberg, Jw" uniqKey="Neuberg J">JW Neuberg</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Caliro, S" uniqKey="Caliro S">S 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