|Mulugeta, G. 2002. Scale Effects and Rheologic Constraints in Ramp-flat Thrust Models. In: Schellart, W. P. and Passchier, C. 2002. Analogue modelling of large-scale tectonic processes. Journal of the Virtual Explorer, 7, 51-59.|
Scale effects and rheologic constraints in ramp-flat thrust models
Dynamic models for
the interactive development of ramp-flat thrust styles are studied in
centrifuge experiments. Plastilina simulates the competent strain-hardening
behaviour of sandstones and carbonates, while viscous or plastic bouncing
putties represent incompetent evaporites and shales. The models exhibit
various fault-fold geometries; e.g. fault bend folds, footwall synclines,
wedge faults as structural expressions of ductile ramp-flat accommodation.
Depending on the rheological stratification, the ramps change shape and
length as slip accumulates along the fault surfaces in flowing surroundings.