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A two-way interaction between the Hainan plume and the Manila subduction zone

Lookup NU author(s): Dr Anne-Sophie Meriaux

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Abstract

The interaction between mantle plumes and subducting slabs is well accepted, but the influence of slabs on plumes has more often been portrayed than the reverse. Here we present three-dimensional upper mantle laboratory models in which a compositional plume rises underneath a subducting plate. Slab/plume buoyancy flux ratios ranged between 7 and 18. The models exhibit a two-way interaction. While the plume conduit increasingly tilts away from the trench as a result of slab rollback-induced toroidal mantle flow, the slab subduction rate decreases as a function of the amount of plume buoyancy opposing that of the slab, which gets subducted beneath the slab. We propose that our models apply to the Hainan/Manila system and explain the recently imaged tilt of the Hainan plume by the Manila slab-induced mantle return flow. The Hainan plume could lessen the Manila subduction rate from 8 Ma into the future.

Publication metadata

Author(s): Meriaux CA, Duarte JC, Wouter PS, Meriaux AS

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2015

Volume: 42

Issue: 14

Pages: 5796-5802

Print publication date: 28/07/2015

Online publication date: 23/07/2015

Acceptance date: 03/06/2015

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: Wiley-Blackwell Publishnig, Inc.

URL: http://dx.doi.org/10.1002/2015GL064313

DOI: 10.1002/2015GL064313

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