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

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 geothermalmore » 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).« less
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [4]
  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)
Publication Date:
Report Number(s):
LA-UR-17-20643
Journal ID: ISSN 0377-0273
Grant/Contract Number:
AC52-06NA25396; INGV-DPC 2007-2009; 2009MCN52R_002
Type:
Accepted Manuscript
Journal Name:
Journal of Volcanology and Geothermal Research
Additional Journal Information:
Journal Volume: 328; Journal ID: ISSN 0377-0273
Research Org:
Univ. of Campania Luigi Vanvitelli, Aversa (Italy); Univ. of Naples Federico II, Naples (Italy); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Inst. of Geophysics and Vulcanology (INGV) (Italy); Ministry of Education, Universities and Research (MIUR) (Italy)
Contributing Orgs:
Analysis and Monitoring of Environmental Risk (AMRA) Center, Naples (Italy)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 3D conductive/convective model; Campi Flegrei caldera; Magmatic system; Eruptive history; Hydrothermal convection
OSTI Identifier:
1374327