Modelling of noncylindrical folds

• Applicant: Professor Dr. Gernold Zulauf
• Subject Area: Palaeontology
• Term: from 2012 to 2018
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 220032794

Noncylindrical buckle folds are important structures, which can be used to constrain the kinematics, finite strain, and rheology of deformed rocks. Singlephase 3D buckle folds can develop by different processes which are hardly verified by modelling. Their geometry is controlled by: (i) the thickness of the competent layer(s), (ii) the geometry and magnitude of bulk finite strain, and (iii) the rheology of matrix and layer. In the present study we will carry out scaled experiments using linear- and nonlinear-viscous rock analogues to simulate 3D folding under pure and general constriction. 3D surface scans and computer tomography will demonstrate how noncylindrical folds are growing and how their geometrical parameters (wavelength, amplitude etc.) are changing with progressive strain. Of particular interest is the relation between geometrical and rheological parameters, which can be used as a paleoviscometer. As noncylindrical folds are frequent in salt domes, the results of the present project should also be of interest for workers dealing with hydrocarbon exploration and pre-site studies for disposal of hazardous waste.

• DFG Programme: Research Grants