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  • 1
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    Nitrogen isotope measurements on hydrothermal fluids from Azores (S. Miguel, Terceira and Graciosa) Islands, Portugal (2010)
    International Association of Geochemistry
    Details
    Publication Date: 2021-01-27
    Description: We present the first nitrogen isotope data from hydrothermal fluids of Graciosa, Terceira and S. Miguel Islands (Azores, Portugal), together with helium isotope composition. 15N values are slightly enriched in light isotopes (from -0.7‰ to -2.2‰) with respect to air, while 3He/4He ratios range from 5 to 6 Ra in Sao Miguel island and from 8 to 9.1 Ra in Graciosa and Terceira islands. The latter values are similar to those found in olivine phenocrysts of basalts (Moreira et al., 1999; Madureira et al., 2005). Such isotope signatures seem to point to the presence of two different deeply-derived end-members: a 3He-rich primitive end-member evident in Terceira and Graciosa islands samples and a 3He-poor end-member characterizing samples from S. Miguel island. According to Madureira et al. (2005), the He primitive component which is more evident in the central parts of the Azores archipelago has to be related to a lower mantle contribution into the prevailing MORB component. On the contrary, the origin of the radiogenic crustal component is still open and debated between the contribution of recycled terrigenous sediments (Turner et al., 1997) and oceanic mantle lithosphere (Schaefer et al., 2002). Since 15N values from fluids vents and inclusions in basalt glasses were discovered to be good geochemical tracers of magma genetic processes, we determined molecular and isotope nitrogen composition (15NN2) in some hydrothermal fluids with the aim to provide additional information on the mantle composition beneath the Azores archipelago. Based on the N2/36Ar ratio we computed for each samples the 15N values of the non-atmospheric nitrogen (15Ndeep). Volatiles emitted from Graciosa and Terceira islands seem to have a common deep nitrogen isotope signature of about -1.5‰ likely resulting from a mixing between lower mantle (15N from 1‰ to 4‰) and upper mantle (15NMORB from -3‰ to -7‰). On the other hand, the 15Ndeep feeding the fumaroles at S. Miguel is close to -5.5‰. Such a 15N-depleted values seem to indicate a probable nitrogen origin from a deep source derived from the recycling of ancient oceanic plate into the upper mantle (MORB). rather than from the recycling of terrigenous sediments transported on top of the descending plate that should have lead to 15N-enrichments.
    Description: Published
    Description: La Malbaie, Quebec, Canada
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: 3.2. Tettonica attiva
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: open
    Keywords: Nitrogen isotopes ; Hydrothermal fluids ; Azores Islands ; Volcanic gases ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 2
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    Geochemistry of groundwater from Graciosa Island (Azores): A contribution to the hydrothermal system conceptual model (2012)
    Mineralogical Magazine
    Details
    Publication Date: 2021-01-27
    Description: 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.
    Description: Published
    Description: Prague, Czech Republic
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: open
    Keywords: Hydrothermal systems ; Graciosa Island, Azores ; Grondwater chemistry ; 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes ; 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters ; 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems ; 03. Hydrosphere::03.04. Chemical and biological::03.04.07. Radioactivity and isotopes
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 3
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    Disaster prevention strategies, based on an education information system (2012)
    Details
    Publication Date: 2020-12-23
    Description: Earthquake damage includes non-structural failure, failure of utility systems and, infrastructure, loss of function and other non-structural damage. Occupants, building owners, insurance companies, building inspectors and others, through their use of the buildings, systems and content, can affect the risk of such negative events. Thus, a prerequisite for more effective disaster risk reduction is increased risk awareness amongst people and in the community and state development planning process, the educational curriculum, and media. As knowledge is clearly connected with understanding risks, the perception of natural hazards and risks in the local environment should be developed with the help of education. This paper presents a comparative study of the current educational curriculum on natural hazards within the school systems in four European countries: Italy, Portugal, Spain and Iceland. None of the countries provides courses dedicated to this topic but include it within other subjects, most often in the natural sciences.
    Description: Co-financed by the EU - Civil Protection Financial Instrument, in the framework the European project ”Urban disaster Prevention Strategies using MAcroseismic Fields and FAult Sources (Acronym: UPStrat-MAFA, Grant Agreement N. 23031/2011/613486/SUB/A5). http://ec.europa.eu/echo/funding/cp_projects2011_en.htm
    Description: Published
    Description: Lisbon - Portugal
    Description: 5.9. Formazione e informazione
    Description: open
    Keywords: risk awareness ; education information system ; UPStrat-MAFA ; 05. General::05.03. Educational, History of Science, Public Issues::05.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 4
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    Stable isotope feature of groundwaters from Graciosa volcanic Island (Azores) – preliminary results (2012)
    Akadémiai Kiadò
    Details
    Publication Date: 2012-02-03
    Description: The Azores archipelago is made of nine islands all of volcanic origin and a few islets located in the North Atlantic Ocean, about 1800 km west of Portuguese mainland at the triple junction of the Eurasian, North American and Nubian plates (Azores Triple Junction = ATJ). Graciosa Island is part of the Central Group of Azores archipelago and is located on the Terceira Rift, a major tectonic feature of the ATJ. The main hydrothermal manifestations at Graciosa Island occur in the Caldeira volcano (SE part of the island), and particularly inside the huge (150 m wide, 80 m high) Furna do Enxofre lava cave located in the Caldeira, where a bubbling mud pool releases steam and gases, leading to the accumulation of CO2 at the bottom of the cave, filled by a coldwater subterranean lake. Three field work campaigns were carried out at Graciosa Island and 14 water samples have been collected, from boreholes, springs and the subterranean lake for isotopic (18O, 2H and 3H) and chemical analysis. The groundwater samples were plotted along the GMWL, and two water groups were identified in the 18O vs. 2H diagram. The splitting up of the samples is even more visible when the O-18 content is plotted as a function of the temperature or as a function of the electrical conductivity. Besides the differences in mineralization and temperature observed in the groundwater samples from Graciosa Island, an isotopic shift towards more enriched values is also observed. The salinity and isotopic content seems to indicate not a simple mixture between two end-members, i.e. seawater – fresh water: another process of mineralization and isotope enrichment must be considered in this active volcanic environment. A hypothesis to be formulated is that the source of salts could be associated to mixing with boiling seawater, that by evaporation will be able to: i) increase groundwater salinity, ii) strongly change the 2H content to more enriched values, and iii) absent or limited variation in d18O content.
    Description: Published
    Description: Budapest, Hungary
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: restricted
    Keywords: Water isotope ; Graziosa Island ; 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 5
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    THE DEVELOPMENT OF AN EDUCATIONAL SYSTEM FOR A LONG TERM TRAINING ON SEISMIC AND VOLCANIC RISK (2012)
    Details
    Publication Date: 2022-06-09
    Description: One of the tasks of the European Project UPStrat-MAFA (Urban Prevention Strategies using MAcroseimic Fields and FAult Sources) is to develop an educational system aimed at long-term training, mainly on seismic hazard and risk. This task will be carried out by sharing the expertise of partners of the project to set different actions, encompassing programs and educational material for students, teachers and general public, and to design an interactive travelling educational path. Starting from the Icelandic educational program tested on schools in the last decade by EERC (Earthquake Engineering Research Centre), the task will develop educational tools especially designed for children, and also new tools using the most spread information channels, in order to outreach information on seismic risk and how to cope with earthquakes. The interactive travelling educational path on earthquakes and volcanoes, aimed at risk-reduction by increasing awareness, is an interactive experience using a multimedia approach, in order to have a very flexible, easy-to-share and appealing set of educational tools (video, simulations, games…) also developed for “edutainment”. The educational path, which is also a travelling exhibition, has to deal with issues related to seismic and volcanoes hazard and risks, especially in urban areas. The whole education-information system developed in the framework of UPStrat-MAFA project is structured to represent both a way to convey project results to the scientific community and to strengthen people’s risk awareness and their training to face up to seismic and/or volcanic events.
    Description: Co-financed by the EU - Civil Protection Financial Instrument, in the framework the European project ”Urban disaster Prevention Strategies using MAcroseismic Fields and FAult Sources” (UPStrat-MAFA - Num. 230301/2011/613486/SUB/A5), DG ECHO Unit A5. http://ec.europa.eu/echo/funding/cp_projects2011_en.htm
    Description: Unpublished
    Description: 19-24 August 2012 in Moscow, Russia.
    Description: 5.9. Formazione e informazione
    Description: open
    Keywords: Science education ; Earthquakes ; Volcanoes ; Travelling exhibition ; European project UPStrat-MAFA ; 05. General::05.03. Educational, History of Science, Public Issues::05.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 6
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    Spatio-temporal characterization of vessel segments applied to retinal angiographic images (2003)
    Elsevier
    Details
    Publication Date: 2003-01-01
    Print ISSN: 0167-8655
    Electronic ISSN: 1872-7344
    Topics: Computer Science
    Published by Elsevier
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  • 7
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    Solid-state detector system for measuring concentrations of tritiated water vapour and other radioactive gases (1999)
    Elsevier
    Details
    Publication Date: 1999-08-01
    Print ISSN: 0168-9002
    Electronic ISSN: 1872-9576
    Topics: Physics
    Published by Elsevier
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  • 8
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    Volcanic lakes of the Azores archipelago (Portugal): Geological setting and geochemical characterization (2006)
    Elsevier
    Details
    Publication Date: 2006-08-01
    Print ISSN: 0377-0273
    Electronic ISSN: 1872-6097
    Topics: Geosciences
    Published by Elsevier
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