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Area of Science:

  • Geophysics
  • Tectonics
  • Geodynamics

Background:

  • Continental lithosphere recycling is complex and less understood than oceanic lithosphere recycling.
  • Delamination and convective downwelling are key processes in lithospheric mantle removal.
  • Oceanic plate subduction's role in adjacent continental lithosphere removal is explored.

Purpose of the Study:

  • To investigate the link between oceanic plate subduction and continental lithosphere removal.
  • To explain the thinning of continental lithosphere adjacent to subduction zones.
  • To reconcile geodynamic models of oceanic-continental tectonics.

Main Methods:

  • Teleseismic body wave imaging from dense broadband seismic experiments.
  • Analysis of subducted Atlantic and Alboran slabs.
  • Rayleigh wave analysis to determine lithospheric mantle thickness.

Main Results:

  • Anomalously fast mantle volumes associated with subducted slabs found beneath continental margins.
  • Significantly thinner lithospheric mantle observed under continental margins.
  • Thin lithosphere extends from orogens inland towards cratonic cores.

Conclusions:

  • Subducting oceanic plates can entrain and remove the base of the continental thermal boundary layer.
  • This process drives surface tectonics and creates topography at the lithosphere-asthenosphere boundary.
  • Leads to secondary downwellings and potential delamination of lithospheric mantle.