Plume-Induced Breakup of a Subducting Plate: Microcontinent Formation Without Cessation of the Subduction Process

Alexander Koptev, Anouk Beniest, Taras Gerya, Todd A. Ehlers, Laurent Jolivet, Sylvie Leroy

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Separation of microcontinents is explained by a ridge jump toward the passive margin as a possible consequence of plume-induced rheological weakening, ultimately leading to breakup followed by accretion of the oceanic crust along a new spreading center. In contrast to such a purely extensional case, the separation of continental microblocks from the main body of the African plate during its continuous northward motion and subduction under Eurasia is still poorly understood. Our numerical experiments show the thermal and buoyancy effects of mantle plume impingement on the bottom of the continental part of a subducting plate are sufficient to induce separation of an isolated microcontinental block from the main subducting continent, even during induced plate motion necessary for uninterrupted oceanic and continental subduction. Subsequent continental accretion occurs by decoupling upper-crustal nappes from the newly formed subducting microcontinent, which is in agreement with the Late Cretaceous-Eocene evolution of the eastern Mediterranean.

Original languageEnglish
Pages (from-to)3663-3675
Number of pages13
JournalGeophysical Research Letters
Volume46
Issue number7
Early online date25 Mar 2019
DOIs
Publication statusPublished - 16 Apr 2019

Fingerprint

plumes
subduction
plume
accretion
folds (geology)
African plate
impingement
spreading center
plate motion
passive margin
mantle plume
continents
buoyancy
nappe
decoupling
oceanic crust
temperature effects
ridges
margins
crusts

Keywords

  • 3-D thermo-mechanical modeling
  • mantle plume
  • microcontinent
  • Neo-Tethys
  • subduction

Cite this

Koptev, Alexander ; Beniest, Anouk ; Gerya, Taras ; Ehlers, Todd A. ; Jolivet, Laurent ; Leroy, Sylvie. / Plume-Induced Breakup of a Subducting Plate : Microcontinent Formation Without Cessation of the Subduction Process. In: Geophysical Research Letters. 2019 ; Vol. 46, No. 7. pp. 3663-3675.
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Plume-Induced Breakup of a Subducting Plate : Microcontinent Formation Without Cessation of the Subduction Process. / Koptev, Alexander; Beniest, Anouk; Gerya, Taras; Ehlers, Todd A.; Jolivet, Laurent; Leroy, Sylvie.

In: Geophysical Research Letters, Vol. 46, No. 7, 16.04.2019, p. 3663-3675.

Research output: Contribution to JournalArticleAcademicpeer-review

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