The causes of sinuous crustal-scale deformation patterns in hot orogens: Evidence from scaled analogue experiments and the southern Central Andes
Riller, Ulrich, Cruden, Alexander R., Boutelier, David, & Schrank, Christoph (2012) The causes of sinuous crustal-scale deformation patterns in hot orogens: Evidence from scaled analogue experiments and the southern Central Andes. Journal of Structural Geology, 37, pp. 65-74.
The cause of upper-crustal segmentation into rhomb-shaped, shear zone-bound domains associated with contractional sedimentary basins in hot, wide orogens is not well understood. Here we use scaled multilayered analogue experiments to investigate the role of an orogen-parallel crustal-strength gradient on the formation of such structures. We show that the aspect ratio and size of domains, the sinuous character and abundance of transpressional shear zones vary with the integrated mechanical strength of crust. Upper-crustal deformation patterns and the degree of strain localization in the experiments are controlled by the ratio between the brittle and ductile strength in the model crust as well as gradients in tectonic and buoyancy forces. The experimental results match the first-order kinematic and structural characteristics of the southern Central Andes and provide insight on the dynamics of underlying deformation patterns in hot, wide orogens.
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|Item Type:||Journal Article|
|Keywords:||Analogue modelling, Central Andes, Plateau formation, Transpression, Basin formation|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Structural Geology (040312)|
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Tectonics (040313)
|Divisions:||Current > Schools > School of Earth, Environmental & Biological Sciences|
Past > Institutes > Institute for Sustainable Resources
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2012 Elsevier Ltd.|
|Deposited On:||29 Nov 2012 10:09|
|Last Modified:||30 Nov 2012 08:17|
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