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Review on symmetric structures in ductile shear zones

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Abstract

Symmetric structures in ductile shear zones range widely in shapes and geneses. Matrix rheology, its flow pattern, its competency contrast with the clast, degree of slip of the clast, shear intensity and its variation across shear zone and deformation temperature, and degree of confinement of clast in shear zones affects (independently) the degree of symmetry of objects. Kinematic vorticity number is one of the parameters that govern tail geometry across clasts. For example, symmetric and nearly straight tails develop if the clast–matrix system underwent dominantly a pure shear/compression. Prolonged deformation and concomitant recrystallization can significantly change the degree of symmetry of clasts. Angular relation between two shear zones or between a shear zone and anisotropy determines fundamentally the degree of symmetry of lozenges. Symmetry of boudinaged clasts too depends on competency contrast between the matrix and clast in some cases, and on the degrees of slip of inter-boudin surfaces and pure shear. Parasitic folds and post-tectonic veins are usually symmetric.

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Acknowledgments

IIT Bombay funded partially. Ripun Kumar Gogoi (IIT Bombay) prepared few diagrams. Reviewer: David Iacopini. Editors: Karel Schulmann, Christian- and Monika Dullo.

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  1. Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, 400 076, India

    Soumyajit Mukherjee

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Mukherjee, S. Review on symmetric structures in ductile shear zones. Int J Earth Sci (Geol Rundsch) 106, 1453–1468 (2017). https://doi.org/10.1007/s00531-016-1366-4

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