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Tag: Subduction zone initiation

The Subduction zone initiation (SZI) Database brings together the specialised and dispersed knowledge and data about the onset of subduction on the Earth. Here, you find graphics based on this up-to-date community knowledge outlining on how new subduction zones form, and have recently formed, on the Earth.

Subduction initiation forcing

The illustration depicts two endmember states in subduction zone initiation: vertically-forced and horizontally-forced subduction initiation.

Illustration of the two endmember states forcing a new subduction zone. The two endmember forcing states characterising subduction zone initiation (SZI) can be described as either vertically-forced or horizontally-forced. As outlined in Crameri et al. (2020), the dominant forcing is either—but never exclusively—vertical (i.e., some combination of plate buoyancy force, the force from any surface load, and vertical mantle-flow force), or horizontal (i.e., some combination of tectonic force and horizontal mantle-flow force).

  • Creator: Fabio Crameri
  • This version: 24.10.2021
  • License: Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
  • Specific citation: This graphic by Fabio Crameri from Crameri et al. (2020) is available via the open-access s-Ink repository.
  • Related reference: Crameri, F., V. Magni, M. Domeier, G.E. Shephard, K. Chotalia, G. Cooper, C. Eakin, A.G. Grima, D. Gürer, A. Király, E. Mulyukova, K. Peters, B. Robert, and M. Thielmann (2020), A transdisciplinary and community-driven database to unravel subduction zone initiation, Nature Communications, 11, 3750. doi:10.1038/s41467-020-17522-9
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Plume-induced subduction

Temporal evolution of subduction initiation in a global, 3-D spherical numerical experiment showing the cold plates and hot mantle plumes.

Temporal evolution of subduction initiation in a global, 3-D spherical numerical experiment showing the cold plates as viscosity isosurfaces (grey) and mantle plumes as a temperature isosurface (red). Individual snapshots highlight the different phases of plume-induced subduction initiation characterised by (a) onset of hot mantle plumes, (b) local lithospheric thinning, (c-d) development of strong lithosphere-asthenosphere boundary topography through shallow horizontal mantle flow and an additional plume pulse, (e-f) plate failure and, finally, (g-h) buoyancy-driven subduction.

  • Creator: Fabio Crameri
  • This version: 01.09.2021
  • License: Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
  • Specific citation: This graphic by Fabio Crameri from Crameri and Tackley (2016) is available via the open-access s-Ink repository.
  • Related reference: Crameri, F., and P. J. Tackley (2016), Subduction initiation from a stagnant lid and global overturn: new insights from numerical models with a free surface, Progress in Earth and Planetary Science, 3(1), 1–19, doi:10.1186/s40645-016-0103-8
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SZI geologic evidence

Schematic illustration of the emplacement of subduction zone initiation (SZI)-typical rock evidence during SZI, and a typical SZI ophiolite sequence.

Schematic illustration of the emplacement of subduction zone initiation (SZI)-typical rock evidence during SZI, and a typical SZI ophiolite sequence. Note that this is a text-book example (according to e.g., the Izu-Bonin-Mariana SZI) and that pre-existing structures (e.g., a pre-existing volcanic arc) or variable SZI dynamics (e.g., horizontal compression) could inhibit various stages and therefore their typical rock signatures.

  • Creator: Fabio Crameri
  • This version: 18.08.2021
  • License: Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
  • Specific citation: This graphic by Fabio Crameri from Crameri et al. (2020) is available via the open-access s-Ink repository.
  • Related reference: Crameri, F., V. Magni, M. Domeier, G.E. Shephard, K. Chotalia, G. Cooper, C. Eakin, A.G. Grima, D. Gürer, A. Király, E. Mulyukova, K. Peters, B. Robert, and M. Thielmann (2020), A transdisciplinary and community-driven database to unravel subduction zone initiation, Nature Communications, 11, 3750. doi:10.1038/s41467-020-17522-9
  • Light & dark versions
  • Vector format
  • Colour-vision deficiency friendly
  • Readable in black&white
Download

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