Superposition of compaction and plane strain

The coaxial and non-coaxial superposition of tectonic (biaxial or plane) strain on compactional (uniaxial) strain is examined and total finite strains and deformation paths calculated. Both prolate and oblate strains may result, depending on the relative orientations of the two strains. The implications of superposed strain are discussed in relation to naturally occurring strains in rocks, and various patterns of finite strain and deformation fields recognized.