Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/7472
DC Field | Value | Language |
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dc.contributor.authorall | Carvalho, M.R.; 1Universidade de Lisboa, Faculdade de Ciencias, Depart. Geologia/CeGUL, Portugal | en |
dc.contributor.authorall | Carreira, P.; Instituto Tecnologico e Nuclear, Lisboa, Portugal | en |
dc.contributor.authorall | Marques, J.M.; Instituto Superior Tecnico, Lisboa, Portugal | en |
dc.contributor.authorall | Capasso, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.authorall | Grassa, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.authorall | Nunes, J.C.; Universidade dos Açores & INOVA Inst., Azores, Portugal | en |
dc.date.accessioned | 2012-01-23T11:09:20Z | en |
dc.date.available | 2012-01-23T11:09:20Z | en |
dc.date.issued | 2011-08-14 | en |
dc.identifier.uri | http://hdl.handle.net/2122/7472 | en |
dc.description.abstract | Graciosa island is located in the Azores Archipelago, along the so-called Terceira Rift, a major tectonic structure that makes the NE boundary of the Azores Plateau. In general terms, it includes a basaltic plataform on the NW and a silicic poligenetic volcano with caldera on the SE, the Graciosa Caldera Volcano. This volcano has produced significant tephra falls, pyroclastic flows, lahars, and lava flows, both of basaltic s.l. and trachitic s.l. composition. The hydrothermal system shows fumarolic emissions inside the volcano caldera and thermal springs located along the shoreline. This system is exploitated in a thermal building through shallow and deep (110 m) boreholes, near the coast. In Graciosa two types of Na-Cl groundwater systems can be identified: 1) a cold one emerging at springs and exploited by wells for public water supply, and 2) a hydrothermal system with temperatures around 40-44 °C. The cold groundwaters have pH higher than 7 and different degree of mineralization, according to the proximity to the sea. The thermal waters show mixing with seawater, pH varying between 6.20 and 6.94, 166 mg/L of SiO2, and significant concentration of metals, such as Mn, Fe, Co, Ni, Cu and Zn. The thermal water mineralization varies strongly, showing EC from 8.87 mS/cm (shallow water) to 47.4 mS/cm (deeper water). The higher mineralized water is rich in CO2(g), with 2130 mg/L of total dissolved CO2. Geothermometers application reveals aquifer temperature around 167 °C and immature/mixed waters, not reaching complete equilibrium with reservoir rock. The geochemistry of the thermal waters indicates the occurrence of seawater/host rock interaction processes at high temperature and slightly acid conditions, favored by CO2(g) input, and a different degrees of mixing with cold and shallow groundwaters. | en |
dc.language.iso | English | en |
dc.publisher.name | Mineralogical Magazine | en |
dc.relation.ispartof | Goldschmidt Conference 2011 | en |
dc.subject | Hydrothermal systems | en |
dc.subject | Graciosa Island, Azores | en |
dc.subject | Grondwater chemistry | en |
dc.title | Geochemistry of groundwater from Graciosa Island (Azores): A contribution to the hydrothermal system conceptual model | en |
dc.type | Poster session | en |
dc.description.status | Published | en |
dc.subject.INGV | 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes | en |
dc.subject.INGV | 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters | en |
dc.subject.INGV | 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases | en |
dc.subject.INGV | 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems | en |
dc.subject.INGV | 03. Hydrosphere::03.04. Chemical and biological::03.04.07. Radioactivity and isotopes | en |
dc.description.ConferenceLocation | Prague, Czech Republic | en |
dc.description.obiettivoSpecifico | 4.5. Studi sul degassamento naturale e sui gas petroliferi | en |
dc.description.fulltext | open | en |
dc.contributor.author | Carvalho, M.R. | en |
dc.contributor.author | Carreira, P. | en |
dc.contributor.author | Marques, J.M. | en |
dc.contributor.author | Capasso, G. | en |
dc.contributor.author | Grassa, F. | en |
dc.contributor.author | Nunes, J.C. | en |
dc.contributor.department | 1Universidade de Lisboa, Faculdade de Ciencias, Depart. Geologia/CeGUL, Portugal | en |
dc.contributor.department | Instituto Tecnologico e Nuclear, Lisboa, Portugal | en |
dc.contributor.department | Instituto Superior Tecnico, Lisboa, Portugal | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.department | Universidade dos Açores & INOVA Inst., Azores, Portugal | en |
item.openairetype | Poster session | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Universidade de Lisboa, Faculdade de Ciências, Departamento Geologia, Inst. D. Luís, Lisboa, Portugal | - |
crisitem.author.dept | Instituto Tecnológico e Nuclear, Estrada Nacional n° 10, 2686-953 Sacavém, Portugal | - |
crisitem.author.dept | Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | - |
crisitem.author.orcid | 0000-0002-5275-1311 | - |
crisitem.author.orcid | 0000-0002-0890-7948 | - |
crisitem.author.orcid | 0000-0001-5043-792X | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Conference materials |
Files in This Item:
File | Description | Size | Format | |
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Carvalho_et_al_Goldschemidt_2011.pdf | Abstract | 26.3 kB | Adobe PDF | View/Open |
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