Displacement and strain patterns from naturally occurring shear zone terminations |
| |
| Authors: | Carol Simpson |
| |
| Institution: | Department of Geology, Oklahoma State University, Stillwater, OK 74078, U.S.A. |
| |
| Abstract: | Strain distribution patterns are described from several naturally occurring ductile shear zone terminations and a two-fold classification is suggested. Type I termination patterns show a symmetrical decrease in strain area and intensity, and are associated with very low shear strain (ψ) values in the main shear zone. The more common Type II termination patterns show a symmetrical increase in strain area with decrease in strain intensity. Some brittle-ductile examples of Type II terminations contain secondary shears that resemble splay faults. All the available evidence suggests that the deformation near the terminations of these shear zones is not plane strain, nor do the observed strain patterns readily fit the existing theoretical models. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
