Geochemical monitoring of the thermal waters of the Phlegraean Fields

Valentino, G.M.; Stanzione, D.

doi:10.1016/s0377-0273(03)00402-5

Cited by 42 publications

(24 citation statements)

References 32 publications

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“…We suggest that the fast heating up of the hydrothermal systems due to the magmatic source emplaced at its bottom vaporized a relevant fraction of the NH 3 -rich hydrothermal system. The presence of relevant quantities of NH 1 4 (700 mmol in average) in the Pisciarelli pool [Valentino and Stanzione, 2004] indicates the feasibility of such a flashing process, leading to the rapid production of N 2 .…”

Section: Discerning Shallow and Deep Magmatic Gases In Timementioning

confidence: 99%

A geochemical and geophysical reappraisal to the significance of the recent unrest at Campi Flegrei caldera (Southern Italy)

Moretti

Natale

Troise

2017

Geochem Geophys Geosyst

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Volcanic unrest at calderas involves complex interaction between magma, hydrothermal fluids, and crustal stress and strain. Campi Flegrei caldera (CFc), located in the Naples (Italy) area and characterized by the highest volcanic risk on Earth for the extreme urbanization, undergoes unrest phenomena involving several meters of uplift and intense shallow microseismicity since several decades. Despite unrest episodes display in the last decade only moderate ground deformation and seismicity, current interpretations of geochemical data point to a highly pressurized hydrothermal system. We show that at CFc, the usual assumption of vapor‐liquid coexistence in the fumarole plumes leads to largely overestimated hydrothermal pressures and, accordingly, interpretations of elevated unrest. By relaxing unconstrained geochemical assumptions, we infer an alternative model yielding better agreement between geophysical and geochemical observations. The model reconciles discrepancies between what observed (1) for two decades since the 1982–1984 large unrest, when shallow magma was supplying heat and fluids to the hydrothermal system, and (2) in the last decade. Compared to the 1980's unrest, the post‐2005 phenomena are characterized by much lower aquifers overpressure and magmatic involvement, as indicated by geophysical data and despite large changes in geochemical indicators. Our interpretation points out a model in which shallow sills, intruded during 1969–1984, have completely cooled, so that fumarole emissions are affected now by deeper, CO2‐richer, magmatic gases producing the modest heating and overpressure of the hydrothermal system. Our results have important implications on the short‐term eruption hazard assessment and on the best strategies for monitoring and interpreting geochemical data.

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Section: Discerning Shallow and Deep Magmatic Gases In Timementioning

confidence: 99%

A geochemical and geophysical reappraisal to the significance of the recent unrest at Campi Flegrei caldera (Southern Italy)

Moretti

Natale

Troise

2017

Geochem Geophys Geosyst

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“…Fumaroles display average temperatures of 95°C at Pisciarelli and up 160°C within the Solfatara crater, and neutral pH that only locally reaching low values between 1 and 2.7 (e.g., Glamoclija et al, 2004;Valentino and Stanzione, 2004;Chiodini et al, 2011). At Pisciarelli, emitted gases display a H 2 S/CO 2 ratio (0.004) and δ 18 O H 2 O values (− 3‰) that are comparable or slightly lower than at Solfatara (0.004-0.01 and − 1‰, respectively; Moretti et al, 2013).…”

Section: The Solfatara-pisciarelli Active Area and The Sulfur-bearingmentioning

confidence: 99%

“…Numerous papers focused on the geochemistry of fumaroles and aquifers and surface gaseous flux, also with the purpose to monitor the volcanic activities (e.g., Dall'Aglio et al, 1972;Le Bronec et al, 1989;Allard et al, 1991;Celico et al, 1992a;Tedesco, 1994;Valentino et al, 1999;Capaccioni and Mangani, 2001;Chiodini et al, 2001Chiodini et al, , 2010Chiodini et al, , 2011Valentino and Stanzione, 2004;Caliro et al, 2007;Vaselli et al, 2011;Aiuppa et al, 2013 and references therein). Few studies address the aspects of water-rock interaction (Caprarelli et al, 1997;Valentino et al, 1999), underground fluid circulation pathways (e.g., Celico et al, 1992b;Rolandi and Stanzione, 1993), and the distribution of the geothermal gradients and hydrothermal facies in the subsurface (e.g., AGIP, 1987;Rosi and Sbrana, 1987;De Vivo et al, 1989).…”

mentioning

confidence: 99%

Native sulfur, sulfates and sulfides from the active Campi Flegrei volcano (southern Italy): Genetic environments and degassing dynamics revealed by mineralogy and isotope geochemistry

Piochi

Mormone

Balassone

et al. 2015

Journal of Volcanology and Geothermal Research

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“…In addition to the role of trace elements in deciphering the source and processes occurring in the hydrothermal reservoir, they are frequently used in monitoring environmental and geomedical impacts (Guo and Wang 2009, Bargagli et al 1997, Elhatip et al 2004, Loppi 2001, Cruz and Franza 2006, Federico et al 2004, Valentino and Stanzione 2004, Vengosh et al 2002. Thermal springs are usually enriched in some potentially toxic elements inherited from the same hydrothermal reservoir.…”

Section: Introductionmentioning

confidence: 99%

Environmental Geochemistry of Potentially Toxic elements in thermal springs in the Sabalan Volcanic Field, NW Iran

Modabberi

2013

E3S Web of Conferences

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Abstract. Thermal springs are widely used by tourists for treatment of dermal diseases and other therapeutic applications. In Iran, thermal springs occur in Northwestern part mainly surrounding the Mount Sabalan which attract hundreds of thousands of tourists annually. Two clusters of springs in Neer and Meshkinshahr areas including 16 thermomineralic springs have been studied in this research and they were sampled twice in May and November in order to investigate the seasonal changes of trace elements in dry and wet seasons. The samples were analyzed in Acme Lab, Canada for 72 elements. Trace element concentrations indicate that most of the elements show concentration well beyond the guideline values for drinking water. While the two sets of samples were taken within a 6 months interval, the elements show slight or no variation from first period to the second and in some cases. Arsenic shows a variation of 5-5834μg/l and the mean As value is 160 times the guideline values (10 μg/l). Other toxic elements with high concentration are B, Fe, Mn, Sb, and Si. Mn and Sb shows exeedance of 12 and 11.5 times respectively. Correlation coefficient and principal component analysis of analytical data indicate that Cl, As, B, Ba, Br, and V show very strong mutual correlation coefficients implying their relationship and common source and fate in the hydrothermal fluid carrying them. These elements fall in the component 1 of PCA. This group of elements is supposed to be derived and sourced from the magmatic-hydrothermal system and through the interaction of hydrothermal fluids with rocks they passed through. Because of discharge of the thermal springs into the nearby streams intended to be used for drinking water and also vast application of spring waters in balneological uses, they may have adverse environmental and health impacts on tourists that expose themselves to this contaminants through balneological applications.

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Geochemical monitoring of the thermal waters of the Phlegraean Fields

Cited by 42 publications

References 32 publications

A geochemical and geophysical reappraisal to the significance of the recent unrest at Campi Flegrei caldera (Southern Italy)

A geochemical and geophysical reappraisal to the significance of the recent unrest at Campi Flegrei caldera (Southern Italy)

Native sulfur, sulfates and sulfides from the active Campi Flegrei volcano (southern Italy): Genetic environments and degassing dynamics revealed by mineralogy and isotope geochemistry

Environmental Geochemistry of Potentially Toxic elements in thermal springs in the Sabalan Volcanic Field, NW Iran

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