Past Seminars

Numerical modelling of accretionary wedge dynamics: from rheological constraints to seamount subduction

Details
  • Dr. Jonas Ruh, SNSF Advanced PostDoc Fellow at ICTJA-CSIC
  • Date: Apr, 26, 2016 12:00 am
  • Place: Sala d’Actes del Institut de Ciències de la Terra Jaume Almera(ICTJA)
  • Location: C/ Solé i Sabarís s/n, Barcelona
  • Further information: Dr. Jaume Verges Masip (ICTJA-CSIC)

Abstract

Thin-skinned fold-and-thrust belts related to convergence tectonics develop by scraping off a rock sequence along a weaker basal décollement often formed by water-saturated shale layers or low-viscosity salt horizons. Numerical models with sophisticated rheologies are used to investigate the structural evolution of fold-and-thrust belts overlying different types of décollements. In addition, the effect of the strength of shear zones within such fold-and-thrust belts is investigated. Shear zones are usually weaker than surrounding rocks, but whether weakening depends on accumulated strain or strain rate is still a matter of debate. Aside rheological effect, geometrical constraints have a large influence on the structural evolution of fold-and-thrust belts. For example, seamounts entering active subduction zone trenches initially collide with the frontal sedimentary accretionary wedges resulting in severe deformation of the overriding plate. A typical feature of this deformation is the occurrence of submarine landslides due to gravitational instabilities. 3D numerical models are applied to infer deformation patterns and stress distribution

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