ABSTRACT
This spectrum results from a range of rheological behavior of the competent layer from brittle, when tensile fracture occurs, to ductile, when ‘failure’ occurs by localized necking.
Anhydrite of the present study was deformed largely by brittle extension fracture resulting in torn boudins. Composite samples consisting of a single anhydrite layer embedded in rock-salt matrix have been experimentally deformed at elevated temperature. Parts of these studies have already been published (Zulauf et al., 2009, 2010a, 2011b). Here, we will compare the geometry of the deformed anhydrite layer deformed under plane, constrictional and flattening conditions. It will be shown that the bulk finite strain geometry has a significant impact on the anhydrite layer and on the shape of the anhydrite boudins, whereas the aspect ratio (boudin width divided by layer thickness) is almost the same for all types of bulk finite strain geometry.
