On the mechanical effects of poroelastic crystal mush in classical magma chamber models
MetadataShow full item record
Improved constraints on the mechanical behavior of magma chambers is essential for understanding volcanic processes; however, the role of crystal mush on the mechanical evolution of magma chambers has not yet been systematically studied. Existing magma chamber models typically consider magma chambers to be isolated melt bodies surrounded by elastic crust. In this study, we develop a physical model to account for the presence and properties of crystal mush in magma chambers and investigate its impact on the mechanical processes during and after injection of new magma. Our model assumes the magma chamber to be a spherical body consisting of a liquid core of fluid magma within a shell of crystal mush that behaves primarily as a poroelastic material. We investigate the characteristics of time‐dependent evolution in the magma chamber, both during and after the injection, and find that quantities such as overpressure and tensile stress continue to evolve after the injection has stopped, a feature that is absent in elastic (mushless) models. The time scales relevant to the postinjection evolution vary from hours to thousands of years, depending on the micromechanical properties of the mush, the viscosity of magma, and chamber size. We compare our poroelastic results to the behavior of a magma chamber with an effectively viscoelastic shell and find that only the poroelastic model displays a time scale dependence on the size of the chamber for any fixed mush volume fraction. This study demonstrates that crystal mush can significantly influence the mechanical behaviors of crustal magmatic reservoirs.
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123(11), (2018): 9376-9406. doi: 10.1029/2018JB015985.
Suggested CitationArticle: Liao, Yang, Soule, S. Adam, Jones, Meghan, "On the mechanical effects of poroelastic crystal mush in classical magma chamber models", Liao, Y., Soule, S. A., & Jones, M. (2018). On the mechanical effects of poroelastic crystal mush in classical magma chamber models. Journal of Geophysical Research: Solid Earth, 123, 9376–9406., DOI:10.1029/2018JB015985, https://hdl.handle.net/1912/23616
Showing items related by title, author, creator and subject.
Geochemistry of lavas from the 2005–2006 eruption at the East Pacific Rise, 9°46′N–9°56′N : implications for ridge crest plumbing and decadal changes in magma chamber compositions Goss, Adam R.; Perfit, Michael R.; Ridley, W. Ian; Rubin, Kenneth H.; Kamenov, George D.; Soule, Samuel A.; Fundis, A.; Fornari, Daniel J. (American Geophysical Union, 2010-05-12)Detailed mapping, sampling, and geochemical analyses of lava flows erupted from an ∼18 km long section of the northern East Pacific Rise (EPR) from 9°46′N to 9°56′N during 2005–2006 provide unique data pertaining to the ...
The influence of magma supply and eruptive processes on axial morphology, crustal construction and magma chambers Hooft, Emilie E. E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-12)Two-thirds of the surface of the Earth is created at mid-ocean ridges where magmas rise from the mantle and cool to form the oceanic crust. The objective of this Thesis is to examine the influence of magma supply and ...
Depth‐dependent permeability and heat output at basalt‐hosted hydrothermal systems across mid‐ocean ridge spreading rates Barreyre, Thibaut; Olive, Jean-Arthur; Crone, Timothy J.; Sohn, Robert A. (John Wiley & Sons, 2018-04-20)The permeability of the oceanic crust exerts a primary influence on the vigor of hydrothermal circulation at mid‐ocean ridges, but it is a difficult to measure parameter that varies with time, space, and geological setting. ...