The thermal regime of the Campi Flegrei magmatic system reconstructed through 3D numerical simulations

Journal Article · Fri Nov 11 00:00:00 EST 2016 · Journal of Volcanology and Geothermal Research

DOI:https://doi.org/10.1016/j.jvolgeores.2016.11.004· OSTI ID:1374327

Di Renzo, Valeria ^[1]; Wohletz, Kenneth ^[2]; Civetta, Lucia ^[3]; Moretti, Roberto ^[1]; Orsi, Giovanni ^[3]; Gasparini, Paolo ^[4]

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1. Univ. of Campania Luigi Vanvitelli, Aversa (Italy). Dept. of Civil Engineering, Design, Construction and Environment
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
3. Univ. of Naples Federico II, Naples (Italy). Dept. of Earth Sciences, Environment and Resources
4. Analysis and Monitoring of Environmental Risk (AMRA) Center, Naples (Italy)

In this paper, we illustrate a quantitative conductive/convective thermal model incorporating a wide range of geophysical, petrological, geological, geochemical and isotopical observations that constrain the thermal evolution and present state of the Campi Flegrei caldera (CFc) magmatic system. The proposed model has been computed on the basis of the current knowledge of: (1) the volcanic and magmatic history of the volcano over the last 44 ka, (2) its underlying crustal structure, and (3) the physical properties of the erupted magmas. 3D numerical simulations of heat conduction and convection within heterogeneous rock/magma materials with evolving heat sources and boundary conditions that simulate magma rise from a deep (≥ 8 km depth) to shallow (2–6 km) reservoirs, magma chamber formation, magma extrusion, caldera collapse, and intra-caldera hydrothermal convection, have been carried out. The evolution of the CFc magmatic system through time has been simulated through different steps related to its changes in terms of depth, location and size of magma reservoirs and their replenishment. The thermal modeling results show that both heat conduction and convection have played an important role in the CFc thermal evolution, although with different timing. Finally, the simulated present heat distribution is in agreement with the measured geothermal profiles (Agip, 1987), reproduces the thermal gradient peaks at the CFc margins in correspondence to the anomalies in surface gradients (Corrado et al., 1998), and suggests temperatures of 700 °C at depth of 4 km in the central portion of the caldera, in agreement with the estimated temperature for the brittle-ductile transition (Hill, 1992).

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Campania Luigi Vanvitelli, Aversa (Italy); Univ. of Naples Federico II, Naples (Italy)
• Sponsoring Organization: Ministry of Education, Universities and Research (MIUR) (Italy); National Inst. of Geophysics and Vulcanology (INGV) (Italy); USDOE
• Contributing Organization: Analysis and Monitoring of Environmental Risk (AMRA) Center, Naples (Italy)
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1374327
• Report Number(s): LA-UR--17-20643
• Journal Information: Journal of Volcanology and Geothermal Research, Journal Name: Journal of Volcanology and Geothermal Research Vol. 328; ISSN 0377-0273
• Country of Publication: United States
• Language: English

Related Subjects

3D conductive/convective model
58 GEOSCIENCES
Campi Flegrei caldera
Eruptive history
Hydrothermal convection
Magmatic system