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EnglishWe investigate the influence of mantle flow relative to the lithosphere on subduction dynamics. We use 2D thermo-mechanical models assuming incompressible non-Newtonian fluid rheology. Different mantle flow velocities consistent with absolute plate motion models are tested, as well as both directions of flow, either sustaining or opposing slab dip. The effects of different inflow/outflow velocity profiles, slab strengths and upper-lower mantle viscosity contrasts are also evaluated. Slab dip deviations between models with opposite mantle flow directions range from 37 for relatively strong slabs (eta(max) = 10(25) Pa s) to 50 for weaker slabs (eta(max) = 10(24) Pa s), accounting for a significant amount of natural slab dip variability. For imposed mantle flow supporting the slab, the initial stage of slab steepening is followed by a stage of continuous slab dip decrease. This slab shallowing eventually leads to mantle wedge closure, subduction cessation and slab break-off, possibly driving subduction flips.
Slab-mantle flow interaction: influence on subduction dynamics and duration / Juan Rodriguez, Gonzalez; Ana M., Negredo; Carminati, Eugenio Ambrogio Maria. - In: TERRA NOVA. - ISSN 0954-4879. - STAMPA. - 26:4(2014), pp. 265-272. [10.1111/ter.12095]
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| Titolo: | Slab-mantle flow interaction: influence on subduction dynamics and duration | |
| Autori: | ||
| Data di pubblicazione: | 2014 | |
| Rivista: | ||
| Citazione: | Slab-mantle flow interaction: influence on subduction dynamics and duration / Juan Rodriguez, Gonzalez; Ana M., Negredo; Carminati, Eugenio Ambrogio Maria. - In: TERRA NOVA. - ISSN 0954-4879. - STAMPA. - 26:4(2014), pp. 265-272. [10.1111/ter.12095] | |
| Handle: | http://hdl.handle.net/11573/540158 | |
| Appartiene alla tipologia: | 01a Articolo in rivista |
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