Plume-slab interaction: The Samoa-Tonga system

TitlePlume-slab interaction: The Samoa-Tonga system
Publication TypeJournal Article
Year of Publication2014
AuthorsDruken KA, Kincaid C, Griffiths RW, Stegman DR, Hart S.R
JournalPhysics of the Earth and Planetary Interiors
Volume232
Pagination1-14
Date Published2014/07
Type of ArticleArticle
ISBN Number0031-9201
Accession NumberWOS:000337859400001
Keywordsdynamics; flow; Fluid experiments; hotspot; interaction; laboratory experiments; Lau Basin; linear volcanic chain; Mantle dynamics; Mantle plumes; phase-relations; ridge; subduction
Abstract

Mantle plume behavior near subducting plates is still poorly understood and in fact varies significantly from the classical hotspot model. We investigate using 3D laboratory models how subduction-driven flow relates to the deformation and dispersal of a nearby plume. Results show slab-driven flow severely distorts plume-driven flow, entraining and passively advecting plume material despite its thermal buoyancy. Downdip sinking of the slab initially stalls vertical plume ascent while the combination of downdip and rollback sinking motions redistribute material throughout the system. As a consequence of the subduction-induced flow, surface expressions differ significantly from traditional plume expectations. Variations in slab sinking style and plume position lead to a range in head and conduit melting signatures, as well as migrating hotspots. For the Samoa-Tonga system, model predictions are consistent with proposed entrainment of plume material around the subducting plate. (C) 2014 Elsevier B.V. All rights reserved.

DOI10.1016/j.pepi.2014.03.003
Short TitlePhys. Earth Planet. Inter.
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