The role of a heterogeneous inclusion during continental collision

Details The role of a heterogeneous inclusion during continental collision The role of a heterogeneous inclusion during continental collision

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...36..236v&link_type=abstract

(International Association of Seismology and Physics of the Earth's Interior, Symposium on Quantitative Geodynamics Lithospheric

Physics

45

Continental Drift, Geodynamics, Lithosphere, Plates (Tectonics), Tectonics, Asia, Collisions, Finite Element Method, India, Rheology, Strain Rate, Viscoplasticity, Vorticity

Scientific paper

The effect of a lithospheric heterogeneity on the finite deformation of a plate indented by a rigid punch is considered. The model parameters are chosen so as to determine the effect of a rigid zone of the lithosphere in front of the indenter. The model is patterned after the geometry of the India-Asia collision but it may be applicable to more general situations. The models are solved by a finite elements technique which allows rheological heterogeneities and several types of boundary conditions and geometries to be taken into account. It is found that the heterogeneity affects the flow in a drastic way even for small contrasts of rigidity and for heterogeneities of small size. The main effect is to create two important shear zones or internal boundary layers. As the flow proceeds, the inclusion rotates and the shear zone progressively bends in qualitative agreement with the bending of large strike slip faults like the Altyn Tagh that separates Tarim from Tibet.

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