See more from this Division: Topical Sessions
See more from this Session: Advances in Discontinuum Numerical Modeling in the Study of Earth Structure and Deformation
Abstract:
We examine the partitioning of strain in these simulations using incremental displacements obtained by differencing particle positions. A nearest neighbor gridding algorithm is employed to obtain spatially averaged displacement vectors on a dense grid imposed over the model domain. Components of the 2-D displacement gradient tensor are then calculated for each grid node, and these in turn are used to calculate the incremental tensors for finite strain and deviatoric strain. These analyses show that the mechanical stratification built into our models encourages the development of what can be described as flexural slip surfaces. These zones of intense shear localize the strain during deformation and folding in a manner very similar to what might be expected in real rock that has developed penetrative mechanical layering. We document the partitioning of strain, as it accommodates folding, into interlayer slip, cross-layer fracture and compaction (dilation), and bed rotation.
See more from this Division: Topical Sessions
See more from this Session: Advances in Discontinuum Numerical Modeling in the Study of Earth Structure and Deformation