Abstract

Both convergence velocity and the thickness of sediment entering a subduction zone affect the dynamics of deformation in this environment. Specifically, the steady-state trench model implies that at constant sediment influx and convergence angle, the strain of underthrust trench deposits varies as the first power of convergence rate for a given distance of underthrusting and as the square of convergence rate for a given duration of underthrusting. Trench deposits are probably disrupted during high-strain and high-strain-rate convergent regimes, whereas they may be more coherently deformed in relatively low-strain and low-strain-rate regimes. Variations from coherent to tectonically disrupted terranes may be interpreted in terms of changes in both convergence rate and influx of trench sediments.

First Page Preview

First page PDF preview
You do not currently have access to this article.