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South-American plate advance and forced Andean trench retreat as drivers for transient flat subduction episodes

Nature communications, 2017-05, Vol.8 (1), p.15249-15249, Article 15249 [Peer Reviewed Journal]

Copyright Nature Publishing Group May 2017 ;info:eu-repo/semantics/openAccess ;Copyright © 2017, The Author(s) 2017 The Author(s) ;ISSN: 2041-1723 ;EISSN: 2041-1723 ;DOI: 10.1038/ncomms15249 ;PMID: 28508893

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  • Title:
    South-American plate advance and forced Andean trench retreat as drivers for transient flat subduction episodes
  • Author: Schepers, Gerben ; van Hinsbergen, Douwe J J ; Spakman, Wim ; Kosters, Martha E ; Boschman, Lydian M ; McQuarrie, Nadine
  • Is Part Of: Nature communications, 2017-05, Vol.8 (1), p.15249-15249, Article 15249
  • Description: At two trench segments below the Andes, the Nazca Plate is subducting sub-horizontally over ∼200-300 km, thought to result from a combination of buoyant oceanic-plateau subduction and hydrodynamic mantle-wedge suction. Whether the actual conditions for both processes to work in concert existed is uncertain. Here we infer from a tectonic reconstruction of the Andes constructed in a mantle reference frame that the Nazca slab has retreated at ∼2 cm per year since ∼50 Ma. In the flat slab portions, no rollback has occurred since their formation at ∼12 Ma, generating 'horse-shoe' slab geometries. We propose that, in concert with other drivers, an overpressured sub-slab mantle supporting the weight of the slab in an advancing upper plate-motion setting can locally impede rollback and maintain flat slabs until slab tearing releases the overpressure. Tear subduction re-establishes a continuous slab and allows the process to recur, providing a mechanism for the transient character of flat slabs.
  • Publisher: England: Nature Publishing Group
  • Language: English;Norwegian
  • Identifier: ISSN: 2041-1723
    EISSN: 2041-1723
    DOI: 10.1038/ncomms15249
    PMID: 28508893
  • Source: NORA Norwegian Open Research Archives
    PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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