Repacking in Compacting Mushes at Intermediate Melt Fractions: Constraints From Numerical Modeling and Phase Separation Experiments on Granular Media

Author:

Florez Darien12ORCID,Huber Christian1ORCID,Hoyos Susana2ORCID,Pec Matej2ORCID,Parmentier E. M.1ORCID,Connolly James A. D.3ORCID,Hirth Greg1

Affiliation:

1. Department of Earth, Environmental and Planetary Sciences Brown University Providence RI USA

2. Department of the Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge MA USA

3. Department of Earth Sciences ETH Zurich Zürich Switzerland

Abstract

AbstractBefore large volumes of crystal poor rhyolites are mobilized as melt, they are extracted through the reduction of pore space within their corresponding crystal matrix (compaction). Petrological and mechanical models suggest that a significant fraction of this process occurs at intermediate melt fractions (ca. 0.3–0.6). The timescales associated with such extraction processes have important ramifications for volcanic hazards. However, it remains unclear how melt is redistributed at the grain‐scale and whether using continuum scale models for compaction is suitable to estimate extraction timescales at these melt fractions. To explore these issues, we develop and apply a two‐phase continuum model of compaction to two suites of analog phase separation experiments—one conducted at low and the other at high temperatures, T, and pressures, P. We characterize the ability of the crystal matrix to resist porosity change using parameterizations of granular phenomena and find that repacking explains both data sets well. A transition between compaction by repacking to melt‐enhanced grain boundary diffusion‐controlled creep near the maximum packing fraction of the mush may explain the difference in compaction rates inferred from high T + P experiments and measured in previous deformation experiments. When upscaling results to magmatic systems at intermediate melt fractions, repacking may provide an efficient mechanism to redistribute melt. Finally, outside nearly instantaneous force chain disruption events occasionally recorded in the low T + P experiments, melt loss is continuous, and two‐phase dynamics can be solved at the continuum scale with an effective matrix viscosity.

Funder

National Science Foundation

Publisher

American Geophysical Union (AGU)

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. New perspectives on ice forcing in continental arc magma plumbing systems;Journal of Volcanology and Geothermal Research;2024-09

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