Alisic, Laura and Rhebergen, Sander and Rudge, John F. and Katz, Richard F. and Wells, Garth N. (2016) Torsion of a cylinder of partially molten rock with a spherical inclusion: Theory and simulation. Geochemistry, Geophysics, Geosystems, 17 (1). pp. 143-161. ISSN 1525-2027 DOI https://doi.org/10.1002/2015GC006061
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Abstract
The processes that are involved in migration and extraction of melt from the mantle are not yet fully understood. Gaining a better understanding of material properties of partially molten rock could help shed light on the behavior of melt on larger scales in the mantle. In this study, we simulate three-dimensional torsional deformation of a partially molten rock that contains a rigid, spherical inclusion. We compare the computed porosity patterns to those found in recent laboratory experiments. The laboratory experiments show emergence of melt-rich bands throughout the rock sample, and pressure shadows around the inclusion. The numerical model displays similar melt-rich bands only for a small bulk-to-shear-viscosity ratio (five or less). The results are consistent with earlier two-dimensional numerical simulations; however, we show that it is easier to form melt-rich bands in three dimensions compared to two. The addition of strain-rate dependence of the viscosity causes a distinct change in the shape of pressure shadows around the inclusion. This change in shape presents an opportunity for experimentalists to identify the strain-rate dependence and therefore the dominant deformation mechanism in torsion experiments with inclusions.
Item Type: | Article |
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Uncontrolled Keywords: | 2015AREP; IA69 |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access |
Journal or Publication Title: | Geochemistry, Geophysics, Geosystems |
Volume: | 17 |
Page Range: | pp. 143-161 |
Identification Number: | https://doi.org/10.1002/2015GC006061 |
Depositing User: | Sarah Humbert |
Date Deposited: | 12 Apr 2017 22:06 |
Last Modified: | 12 Apr 2017 22:06 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/3924 |
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