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An analysis of shear fractures

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Proceedings / Indian Academy of Sciences

Abstract

The megascopically isotropic granites of Tirupati have several sets of joints of which the two joint sets of N 64° W and N 70° E trends have a prominent development. Their axis of intersection is vertical. The angle between the two is 46°. The E-W direction bisects this dihedralangle, and it is, therefore, interpreted that the compressive force has acted in the E-W direction. Petrofabric analysis of the granites reveals the presence of another set of conjugate shear, statistical in nature, making a dihedral angle of 60°, and with the axis of intersection horizontal oriented in a N-S direction. This dihedral angle is bisected by the same E-W directed compressive force. Conclusion is drawn that both the megascopic conjugate shear intersecting in a vertical axis and the potential shear joints intersecting in a horizontal axis are developed by a compressive force acting in the E-W direction.

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Authors and Affiliations

  1. Department of Geology, Sri Venkateswara University, Tirupati, Andhra Pradesh

    K. V. Suryanarayana

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  1. K. V. Suryanarayana
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Suryanarayana, K.V. An analysis of shear fractures. Proc. Indian Acad. Sci. 82, 52–56 (1975). https://doi.org/10.1007/BF03050517

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  • DOI: https://doi.org/10.1007/BF03050517

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