Premium
A two‐way interaction between the Hainan plume and the Manila subduction zone
Author(s) -
Mériaux Catherine A.,
Duarte João C.,
Schellart Wouter P.,
Mériaux AnneSophie
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl064313
Subject(s) - plume , slab , subduction , geology , buoyancy , mantle (geology) , mantle plume , geophysics , trench , panache , slab window , seismology , transition zone , mantle wedge , petrology , tectonics , oceanic crust , mechanics , lithosphere , meteorology , materials science , physics , layer (electronics) , composite material
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.