Phase dependent strain partitioning in obliquely convergent settings

Hoffmann-Rothe, A.; Kukowski, N.; Oncken, Onno

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Phase dependent strain partitioning in obliquely convergent settings

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Hoffmann-Rothe, A.
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Kukowski, N.
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Oncken, Onno
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Hoffmann-Rothe, A., Kukowski, N., Oncken, O. (2004): Phase dependent strain partitioning in obliquely convergent settings, (Abstract Volume), GeoMod 2004 (Emmetten, Switzerland 2004).

https://gfzpublic.gfz-potsdam.de/pubman/item/item_230530

Abstract

Physical (sandbox) simulations of obliquely convergent accretionary subduction margins show that the cyclicity of accretionary processes imposes a strong control on forearc deformation. Strain partitioning, i.e. the spatial separation of margin-normal and margin-parallel strain, is most dominant while new thrusts are forming at the deformation front. Shortening remains focused at the toe of the wedge, but the margin-parallel component reaches far into the forearc. Faults trending parallel to the trench are dominated by strike-slip motion. The results suggest that the forearc deformation pattern alternates with the characteristic time scale on which new thrust-slices are generated in the accretionary wedge (several 100.000 years).