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The Mechanical Response of a Magma Chamber With Poroviscoelastic Crystal Mush
Author(s) -
Liao Yang,
Soule S. Adam,
Jones Max,
Le Mével Hélène
Publication year - 2021
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2020jb019395
Subject(s) - poromechanics , viscoelasticity , rheology , magma chamber , magma , geology , diffusion , relaxation (psychology) , petrology , materials science , volcano , geotechnical engineering , thermodynamics , geochemistry , composite material , physics , porous medium , psychology , social psychology , porosity
Improved understanding of the impact of crystal mush rheology on the response of magma chambers to magmatic events is critical for better understanding crustal igneous systems with abundant crystals. In this study, we extend an earlier model by Liao et al. (2018); https://doi.org/10.1029/2018jb015985 which considers the mechanical response of a magma chamber with poroelastic crystal mush, by including poroviscoelastic rheology of crystal mush. We find that the coexistence of the two mechanisms of poroelastic diffusion and viscoelastic relaxation causes the magma chamber to react to a magma injection event with more complex time‐dependent behaviors. Specifically, we find that the system’s short‐term evolution is dominated by the poroelastic diffusion process, while its long‐term evolution is dominated by the viscoelastic relaxation process. We identify two post‐injection timescales that represent these two stages and examine their relation to the material properties of the system. We find that better constraints on the poroelastic diffusion time are more important for the potential interpretation of surface deformation using the model.