Dynamics of post-slab breakoff in convergent plate margins: a "jellyfish" Model

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ID: 305781
2011
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Abstract
The Earth9s subduction zones are characterized by a complex architecture of the subducting slabs, including necking, tearing, detachment from the surface plate, breakoff or ultimate slab loss, in contrast to the idealized models as popularly envisaged. Here we address the fate of the subducted slab after its breakoff by employing a simple two dimensional numerical modeling. Our results agree well with the tectonic scenario and geometric evolution of slab breakoff and reveal that during the sinking of broken slab fragments, the shape of the low viscosity slab (1-1000 times more viscous than the surrounding mantle) evolves into an inverted plume, similar to the "jellyfish" model proposed in some recent studies on deep subduction slabs. Our results confirm that the penetration criteria of the jellyfish into the lower mantle are primarily governed by the viscosity contrast between the lower to upper mantle. An evaluation of the various parameters suggest that the broken slab fragments may achieve a diverse type of morphology, correlating well with a similar diversity observed from high resolution seismic tomographic studies.
Reference Key
openalex_W2313486645 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Bhaskar Kundu, M. Santosh
Journal american journal of science
Year 2011
DOI
10.2475/08.2011.03
URL
https://doi.org/10.2475/08.2011.03
Keywords Keywords not found

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