Ductile compaction of partially molten rocks: The effect of non-linear viscous rheology on instability and segregation

TitleDuctile compaction of partially molten rocks: The effect of non-linear viscous rheology on instability and segregation
Publication TypeJournal Article
Year of Publication2015
AuthorsE Veveakis, K Regenauer-Lieb, and RF Weinberg
JournalGeophysical Journal International
Volume200
Issue1
Start Page519
Pagination519 - 523
Date Published01/2015
Abstract

© The Authors 2014. Published by Oxford University Press on behalf of the Royal Astronomical Society. The segregation of melt from a linear viscous matrix is traditionally described by McKenzie's compaction theory. This classical solution overlooks instabilities that arise when non-linear solid matrix behaviour is considered. Here we report a closed form 1-D solution obtained by extending McKenzie's theory to non-linear matrix behaviours. The new solution provides periodic stress singularities, acting as high porosity melt channels, to be the fundamental response of the compacted matrix. The characteristic length controlling the periodicity is still McKenzie's compaction length δ<inf>c</inf>, adjusted for non-linear rheologies.

DOI10.1093/gji/ggu412
Short TitleGeophysical Journal International