Hydrothermal fluid venting in the offshore sector of Campi Flegrei caldera: A geochemical, geophysical, and volcanological study

Giuseppe Ciraolo, Alessandro Aiuppa, Attilio Sulli, Rossella Di Napoli, Carmelo Nasello, Mariano Valenza, Acocella, Stefano Caliro, Aiuppa, Di Vito, Chiodini

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Abstract

The ongoing unrest at the Campi Flegrei caldera (CFc) in southern Italy is prompting explorationof its poorly studied offshore sector. We report on a multidisciplinary investigation of the Secca delleFumose (SdF), a submarine relief known since antiquity as the largest degassing structure of the offshoresector of CFc. We combined high-resolution morphobathymetric and seismostratigraphic data with onshoregeological information to propose that the present-day SdF morphology and structure developed duringthe initial stages of the last CFc eruption at Monte Nuovo in AD 1538. We suggest that the SdF relief standson the eastern uplifted border of a N-S-trending graben-like structure formed during the shallow emplacementof the Monte Nuovo feeding dike. We also infer that the high-angle bordering faults that generatedthe SdF relief now preferentially allow the ascent of hot brines (with an equilibrium temperature of 1798C),thereby sustaining hydrothermal degassing on the seafloor. Systematic vertical seawater profiling showsthat hydrothermal seafloor venting generates a sizeable CO2, pH, and temperature anomaly in the overlyingseawater column. Data for the seawater vertical profile can be used to estimate the CO2 and energy (heat)outputs from the SdF area at 50 tons/d (0.53 kg/s) and 80 MW, respectively. In view of the cause-effectrelationship with the Monte Nuovo eruption, and the substantial gas and energy outputs, we consider thatthe SdF hydrothermal system needs to be included in monitoring programs of the ongoing CFc unrest.
Lingua originaleEnglish
pagine (da-a)4153-4178
Numero di pagine26
RivistaGeochemistry, Geophysics, Geosystems
Volume17
Stato di pubblicazionePublished - 2016

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venting
calderas
Degassing
hydrothermal fluid
caldera
Seawater
sectors
Brines
Levees
relief
Fluids
degassing
fluids
volcanic eruptions
seafloor
volcanic eruption
Gases
antiquities
seawater
brines

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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title = "Hydrothermal fluid venting in the offshore sector of Campi Flegrei caldera: A geochemical, geophysical, and volcanological study",
abstract = "The ongoing unrest at the Campi Flegrei caldera (CFc) in southern Italy is prompting explorationof its poorly studied offshore sector. We report on a multidisciplinary investigation of the Secca delleFumose (SdF), a submarine relief known since antiquity as the largest degassing structure of the offshoresector of CFc. We combined high-resolution morphobathymetric and seismostratigraphic data with onshoregeological information to propose that the present-day SdF morphology and structure developed duringthe initial stages of the last CFc eruption at Monte Nuovo in AD 1538. We suggest that the SdF relief standson the eastern uplifted border of a N-S-trending graben-like structure formed during the shallow emplacementof the Monte Nuovo feeding dike. We also infer that the high-angle bordering faults that generatedthe SdF relief now preferentially allow the ascent of hot brines (with an equilibrium temperature of 1798C),thereby sustaining hydrothermal degassing on the seafloor. Systematic vertical seawater profiling showsthat hydrothermal seafloor venting generates a sizeable CO2, pH, and temperature anomaly in the overlyingseawater column. Data for the seawater vertical profile can be used to estimate the CO2 and energy (heat)outputs from the SdF area at 50 tons/d (0.53 kg/s) and 80 MW, respectively. In view of the cause-effectrelationship with the Monte Nuovo eruption, and the substantial gas and energy outputs, we consider thatthe SdF hydrothermal system needs to be included in monitoring programs of the ongoing CFc unrest.",
author = "Giuseppe Ciraolo and Alessandro Aiuppa and Attilio Sulli and {Di Napoli}, Rossella and Carmelo Nasello and Mariano Valenza and Acocella and Stefano Caliro and Aiuppa and {Di Vito} and Chiodini",
year = "2016",
language = "English",
volume = "17",
pages = "4153--4178",
journal = "Geochemistry, Geophysics, Geosystems",
issn = "1525-2027",
publisher = "American Geophysical Union",

}

TY - JOUR

T1 - Hydrothermal fluid venting in the offshore sector of Campi Flegrei caldera: A geochemical, geophysical, and volcanological study

AU - Ciraolo, Giuseppe

AU - Aiuppa, Alessandro

AU - Sulli, Attilio

AU - Di Napoli, Rossella

AU - Nasello, Carmelo

AU - Valenza, Mariano

AU - Acocella, null

AU - Caliro, Stefano

AU - Aiuppa, null

AU - Di Vito, null

AU - Chiodini, null

PY - 2016

Y1 - 2016

N2 - The ongoing unrest at the Campi Flegrei caldera (CFc) in southern Italy is prompting explorationof its poorly studied offshore sector. We report on a multidisciplinary investigation of the Secca delleFumose (SdF), a submarine relief known since antiquity as the largest degassing structure of the offshoresector of CFc. We combined high-resolution morphobathymetric and seismostratigraphic data with onshoregeological information to propose that the present-day SdF morphology and structure developed duringthe initial stages of the last CFc eruption at Monte Nuovo in AD 1538. We suggest that the SdF relief standson the eastern uplifted border of a N-S-trending graben-like structure formed during the shallow emplacementof the Monte Nuovo feeding dike. We also infer that the high-angle bordering faults that generatedthe SdF relief now preferentially allow the ascent of hot brines (with an equilibrium temperature of 1798C),thereby sustaining hydrothermal degassing on the seafloor. Systematic vertical seawater profiling showsthat hydrothermal seafloor venting generates a sizeable CO2, pH, and temperature anomaly in the overlyingseawater column. Data for the seawater vertical profile can be used to estimate the CO2 and energy (heat)outputs from the SdF area at 50 tons/d (0.53 kg/s) and 80 MW, respectively. In view of the cause-effectrelationship with the Monte Nuovo eruption, and the substantial gas and energy outputs, we consider thatthe SdF hydrothermal system needs to be included in monitoring programs of the ongoing CFc unrest.

AB - The ongoing unrest at the Campi Flegrei caldera (CFc) in southern Italy is prompting explorationof its poorly studied offshore sector. We report on a multidisciplinary investigation of the Secca delleFumose (SdF), a submarine relief known since antiquity as the largest degassing structure of the offshoresector of CFc. We combined high-resolution morphobathymetric and seismostratigraphic data with onshoregeological information to propose that the present-day SdF morphology and structure developed duringthe initial stages of the last CFc eruption at Monte Nuovo in AD 1538. We suggest that the SdF relief standson the eastern uplifted border of a N-S-trending graben-like structure formed during the shallow emplacementof the Monte Nuovo feeding dike. We also infer that the high-angle bordering faults that generatedthe SdF relief now preferentially allow the ascent of hot brines (with an equilibrium temperature of 1798C),thereby sustaining hydrothermal degassing on the seafloor. Systematic vertical seawater profiling showsthat hydrothermal seafloor venting generates a sizeable CO2, pH, and temperature anomaly in the overlyingseawater column. Data for the seawater vertical profile can be used to estimate the CO2 and energy (heat)outputs from the SdF area at 50 tons/d (0.53 kg/s) and 80 MW, respectively. In view of the cause-effectrelationship with the Monte Nuovo eruption, and the substantial gas and energy outputs, we consider thatthe SdF hydrothermal system needs to be included in monitoring programs of the ongoing CFc unrest.

UR - http://hdl.handle.net/10447/221917

M3 - Article

VL - 17

SP - 4153

EP - 4178

JO - Geochemistry, Geophysics, Geosystems

JF - Geochemistry, Geophysics, Geosystems

SN - 1525-2027

ER -