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| Titel |
Different ways to portrait anisotropic mantle rheology. |
| VerfasserIn |
Alexander Simakin |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047395
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| Zusammenfassung |
| Anizotropic texture of the mantle rocks subjected to the high shear rates e.g. in subduction
zones are unambiguously observed with seismic methods. Textured liquids have viscosity
dependent on direction of flow that is described as a tensor parameter. Theory of viscosity
tensor is used at the modeling of flow of liquid crystals and glaciers. In both cases the
simplest transeversely –isotropic rheology (TIR) arises first. Moreover in 2D all variety of
anisotropic rheologies is reduced to TIR characterized with two viscosity components normal
(ηN) and parallel (ηS) to the shear direction. Texture can be specified by the single
parameter – orientation of the vector (director) parallel to the layering. Director
alignment evolves due to the effect of pure shear component and rotation. Subduction
flow is similar to the simple shear. In a simple shear flow non-interacting director
rotates to the position parallel to shear direction if parameter of the sensibility to
extension λ=1. When λ |
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