Plume-Induced Subduction Initiation: Single-Slab or Multi-Slab Subduction?

Research output: Contribution to journal › Article › Research › peer review

Authors

  • M. Baes
  • S. Sobolev
  • T. Gerya
  • S. Brune

External Research Organisations

  • Helmholtz Centre Potsdam - German Research Centre for Geosciences (GFZ)
  • University of Potsdam
  • ETH Zurich
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Details

Original languageEnglish
Article numbere2019GC008663
JournalGeochemistry, Geophysics, Geosystems
Volume21
Issue number2
Early online date30 Jan 2020
Publication statusPublished - 12 Feb 2020
Externally publishedYes

Abstract

Initiation of subduction following the impingement of a hot buoyant mantle plume is one of the few scenarios that allow breaking the lithosphere and recycling a stagnant lid without requiring any preexisting weak zones. Here, we investigate factors controlling the number and shape of retreating subducting slabs formed by plume-lithosphere interaction. Using 3-D thermomechanical models we show that the deformation regime, which defines formation of single-slab or multi-slab subduction, depends on several parameters such as age of oceanic lithosphere, thickness of the crust and large-scale lithospheric extension rate. Our model results indicate that on present-day Earth multi-slab plume-induced subduction is initiated only if the oceanic lithosphere is relatively young (<30–40 Myr, but >10 Myr), and the crust has a typical thickness of 8 km. In turn, development of single-slab subduction is facilitated by older lithosphere and pre-imposed extensional stresses. In early Earth, plume-lithosphere interaction could have led to formation of either episodic short-lived circular subduction when the oceanic lithosphere was young or to multi-slab subduction when the lithosphere was old.

Keywords

    multi-slab, numerical model, plume, singleslab, subduction zone

ASJC Scopus subject areas

Cite this

Plume-Induced Subduction Initiation: Single-Slab or Multi-Slab Subduction? / Baes, M.; Sobolev, S.; Gerya, T. et al.
In: Geochemistry, Geophysics, Geosystems, Vol. 21, No. 2, e2019GC008663, 12.02.2020.

Research output: Contribution to journal › Article › Research › peer review

Baes M, Sobolev S, Gerya T, Brune S. Plume-Induced Subduction Initiation: Single-Slab or Multi-Slab Subduction? Geochemistry, Geophysics, Geosystems. 2020 Feb 12;21(2):e2019GC008663. Epub 2020 Jan 30. doi: 10.1029/2019GC008663
Baes, M. ; Sobolev, S. ; Gerya, T. et al. / Plume-Induced Subduction Initiation: Single-Slab or Multi-Slab Subduction?. In: Geochemistry, Geophysics, Geosystems. 2020 ; Vol. 21, No. 2.
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N1 - Funding Information: This work has been funded by the German Science Foundation (DFG) (Project BR 5815/1-1). The computational resources were provided by the North German Supercomputing Alliance (HLRN). The data regarding experiments in this study have been provided in GFZ data services (https://webmail.gfz-potsdam.de/Redirect/5292A2DA/doi.org/10.5880/GFZ.2.5.2019.002).

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