A numerical model for the magmatic heat reservoir of the Las Tres Virgenes volcanic complex, Baja California Sur, Mexico
Por:
Guerrero, Fernando J., Sosa-Ceballos, Giovanni, Prol-Ledesma, Rosa M., Jacome-Paz, Mariana P., Calo, Marco, de la Cruz, Luis Miguel, Macias, Jose Luis
Publicada:
1 jun 2021
Resumen:
Numerical models of geothermal systems have achieved considerable
progress when dealing with fundamental transport processes.
Site-specific geothermal models however, often face the lack of
sufficient field data, which leads to under constrained models. Recent
field studies in the Las Tres Virgenes volcanic complex (TVVC) provide
us with a sound framework to build a numerical model for the magmatic
heat reservoir of the geothermal area. Here we present a conceptual
model of the system from 30 ka to present based on updated structural
and geochronological studies. The heat reservoir is described from
Enhanced Seismic Tomography of the TVVC. New field data also allow an
estimate of the radiogenic heat generation in the batholith of the study
area. Latent heat of crystallization is also considered in the cooling
of magmatic intrusions. The transient heat transfer equation is solved
with a finite volume numerical method and a conjugate gradient
algorithm. The model is calibrated using the estimated heat flow in the
area from the literature. The simulation results predict slow cooling of
the heat reservoir, with the maximum temperature decreasing about 9
degrees C in 30 ky. The temperature field within the magmatic heat
reservoir overall remains between about 790 degrees C (8 km bsl) and 300
degrees C (3 km bsl), in the order of the temperatures at which magmatic
processes, such as magma mixing and replenishments, have been inferred
from the eruptive history. Whereas the phase ratio (solid/melt) ranges
from 1, at the top, to below 0.1 at the bottom of the heat reservoir.
Convective transport and explicit thermal-chemical coupling in the heat
reservoir is proposed as a future expansion of this work.
(c) 2021 Elsevier B.V. All rights reserved.
Filiaciones:
Guerrero, Fernando J.:
Institute of Geophysics, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F., 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geophys, Mexico City 04510, DF, Mexico
Sosa-Ceballos, Giovanni:
Institute of Geophysics, Unidad Michoacán, UNAM, Antigua Carretera a Patzcuaro 8701, Morelia, Michoacán 58190, Mexico
UNAM, Unidad Michoacan, Inst Geophys, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Prol-Ledesma, Rosa M.:
Institute of Geophysics, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F., 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geophys, Mexico City 04510, DF, Mexico
Jacome-Paz, Mariana P.:
Institute of Geophysics, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F., 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geophys, Mexico City 04510, DF, Mexico
Calo, Marco:
Institute of Geophysics, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F., 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geophys, Mexico City 04510, DF, Mexico
de la Cruz, Luis Miguel:
Institute of Geophysics, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F., 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geophys, Mexico City 04510, DF, Mexico
Macias, Jose Luis:
Institute of Geophysics, Unidad Michoacán, UNAM, Antigua Carretera a Patzcuaro 8701, Morelia, Michoacán 58190, Mexico
UNAM, Unidad Michoacan, Inst Geophys, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
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