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

Catherine A. Mériaux*, João C. Duarte, Wouter P. Schellart, Anne Sophie Mériaux

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

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 8Ma into the future.

Original languageEnglish
Pages (from-to)5796-5802
Number of pages7
JournalGeophysical Research Letters
Volume42
Issue number14
DOIs
Publication statusPublished - 28 Jul 2015

Keywords

  • analogue modeling
  • mantle plumes
  • subduction

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