Crystal Shape Control on the Repacking and Jamming of Crystal‐Rich Mushes
Name
Geophysical Research Letters - 2022 - Hoyos - Crystal Shape Control on the Repacking and Jamming of Crystal‐Rich Mushes.pdf
Description
Published version
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1012.51 KB
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Checksum (MD5)
c16a76402b1c3517739aa5527450a107
Author(s)
Hoyos, Susana
Florez, Darien
Pec, Matej
Huber, Christian
Date Issued
September 22, 2022
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Hoyos, S., Florez, D., Pec, M., & Huber, C. (2022). Crystal shape control on the repacking and jamming of crystal-rich mushes. Geophysical Research Letters, 49, e2022GL100040.
Version
Final published version
Abstract
The rheology of crustal mushes is a crucial parameter controlling melt segregation and magma flow. However, the relations between mush dynamics and crystal size and shape distribution remain poorly understood because of the complexity of melt‐crystal and crystal‐crystal interactions. We performed analog experiments to characterize the mechanisms that control pore space reduction associated with repacking. Three suspensions of monodisperse particles with different geometries and aspect ratios (1:1, 2:1, 4:1) in a viscous fluid were tested. Our results show that particle aspect ratios strongly control the melt extraction processes. We identify two competing mechanisms that enable melt extraction at grain scale. The first mechanism leads to continuous deformation and melt extraction and is associated with “diffuse” frictional dissipation between neighboring particles. The second is stochastic, localized, and nearly instantaneous and is associated with the development and destruction of force chains percolating through the granular assembly.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution
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DOI of Published Version
10.1029/2022gl100040
