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Evidence of a recent input of magmatic gases into the quiescent volcanic edifice of Panarea, Aeolian Islands, Italy
Author(s)
Language
English
Status
Published
Peer review journal
Yes
Title of the book
Issue/vol(year)
31 (2004)
Publisher
American Geophysical Union
Pages (printed)
L07619
Issued date
2004
Alternative Location
Subjects
Abstract
On 2nd/3rd November 2002, a huge amount of gas,
mainly composed of CO2, was suddenly released from the sea bottom off the coast of Panarea, producing a ‘‘crater’’20 by 10 meters wide and 7 meters deep. The gas output was estimated to be 109 l/d, two orders of magnitude higher than
that measured in the 1980s. The anomalous degassing rate lasted for some weeks, slowly decreasing to an almost constant rate of about 4 x 107 l/d after two months. The geothermo-
barometric estimations revealed an increase of both the temperature and pressure in the geothermal system feeding the sampled vents. The 3He/4He ratios were similar to those measured in nearby Stromboli. We have monitored the area for the last two decades, and based on our intensive and extensive geochemical measurements, have
ascertained that the geothermal reservoir has lost its steady state. We maintain that a new magmatic input caused these phenomena.
mainly composed of CO2, was suddenly released from the sea bottom off the coast of Panarea, producing a ‘‘crater’’20 by 10 meters wide and 7 meters deep. The gas output was estimated to be 109 l/d, two orders of magnitude higher than
that measured in the 1980s. The anomalous degassing rate lasted for some weeks, slowly decreasing to an almost constant rate of about 4 x 107 l/d after two months. The geothermo-
barometric estimations revealed an increase of both the temperature and pressure in the geothermal system feeding the sampled vents. The 3He/4He ratios were similar to those measured in nearby Stromboli. We have monitored the area for the last two decades, and based on our intensive and extensive geochemical measurements, have
ascertained that the geothermal reservoir has lost its steady state. We maintain that a new magmatic input caused these phenomena.
Sponsors
- Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano,
Naples, Italy.
- Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo,
Palermo, Italy.
- Dipartimento Chimica e Fisica della Terra ed Applicazioni, Palermo,
Italy.
Naples, Italy.
- Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo,
Palermo, Italy.
- Dipartimento Chimica e Fisica della Terra ed Applicazioni, Palermo,
Italy.
References
Calanchi, N., B. Capaccioni, M. Martini, F. Tassi, and L. Valentini (1995), Submarine gas-emission from Panarea Island (Aeolian Archipelago): Distribution of inorganic and organic compounds and inferences about source conditions, Acta Vulcanol., 7, 43–48.
Chiodini, G. (1994), Temperature, pressure and redox conditions governing the composition of the cold CO2 gases discharged in north Latium (central
Italy), Appl. Geochem., 9, 287–295.
Chiodini, G., and L. Marini (1998), Hydrothermal gas equilibria: The H2OH2-CO2-CO-CH4 system, Geochim. Cosmochim. Acta, 62, 2673–2687.
Chiodini, G., R. Cioni, and L. Marini (1993), Reactions governing the chemistry of crater fumaroles from Vulcano Island, Italy, and implications for volcanic surveillance, Appl. Geochem., 8, 357–371.
Cioni, R., E. Corazza, and L. Marini (1984), The gas/steam ratio as indicator of heat transfer at the Solfatara fumaroles, Phlegraean Fields (Italy), Bull. Volcanol., 47, 295–302.
D’Amore, F., and C. Panichi (1980), Evaluation of deep temperature of hydrothermal systems by a new gas-geothermometer, Geochim. Cosmochim. Acta, 44, 549–556.
Giggenbach, W. F. (1975), A simple method for the collection and analysis of volcanic gas samples, Bull. Volcanol., 39, 15–27.
Giggenbach, W. F. (1987), Redox processes governing the chemistry of fumarolic gas discharges from White Island, New Zealand, Appl. Geochem., 2, 143–161.
Giggenbach, W. F. (1996), Chemical composition of volcanic gases,in Monitoring and Mitigation of Volcanic Hazards, edited by R. Scarpa and R. I. Tilling, pp. 221–256, Springer-Verlag, New
York.
Inguaggiato, S., and A. Rizzo (2004), Dissolved helium isotope ratios in ground-waters: A new technique based on gas-water re-equilibration
and its application to a volcanic area, Appl. Geochem., 19, 665–673.
Italiano, F., and P. M. Nuccio (1991), Geochemical investigations of submarine
exhalations to the east of Panarea, Aeolian Islands, Italy, J. Volcanol. Geotherm. Res., 46, 125–141.
Chiodini, G. (1994), Temperature, pressure and redox conditions governing the composition of the cold CO2 gases discharged in north Latium (central
Italy), Appl. Geochem., 9, 287–295.
Chiodini, G., and L. Marini (1998), Hydrothermal gas equilibria: The H2OH2-CO2-CO-CH4 system, Geochim. Cosmochim. Acta, 62, 2673–2687.
Chiodini, G., R. Cioni, and L. Marini (1993), Reactions governing the chemistry of crater fumaroles from Vulcano Island, Italy, and implications for volcanic surveillance, Appl. Geochem., 8, 357–371.
Cioni, R., E. Corazza, and L. Marini (1984), The gas/steam ratio as indicator of heat transfer at the Solfatara fumaroles, Phlegraean Fields (Italy), Bull. Volcanol., 47, 295–302.
D’Amore, F., and C. Panichi (1980), Evaluation of deep temperature of hydrothermal systems by a new gas-geothermometer, Geochim. Cosmochim. Acta, 44, 549–556.
Giggenbach, W. F. (1975), A simple method for the collection and analysis of volcanic gas samples, Bull. Volcanol., 39, 15–27.
Giggenbach, W. F. (1987), Redox processes governing the chemistry of fumarolic gas discharges from White Island, New Zealand, Appl. Geochem., 2, 143–161.
Giggenbach, W. F. (1996), Chemical composition of volcanic gases,in Monitoring and Mitigation of Volcanic Hazards, edited by R. Scarpa and R. I. Tilling, pp. 221–256, Springer-Verlag, New
York.
Inguaggiato, S., and A. Rizzo (2004), Dissolved helium isotope ratios in ground-waters: A new technique based on gas-water re-equilibration
and its application to a volcanic area, Appl. Geochem., 19, 665–673.
Italiano, F., and P. M. Nuccio (1991), Geochemical investigations of submarine
exhalations to the east of Panarea, Aeolian Islands, Italy, J. Volcanol. Geotherm. Res., 46, 125–141.
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