Side-stepping of axial surface traces in superposed folding

Ghosh, S. K. (1995) Side-stepping of axial surface traces in superposed folding Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 104 (3). pp. 373-383. ISSN 0253-4126

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During the refolding of an early non-isoclinal fold (say, F1) we may find an offset or side-stepping of the axial surfaces of the later folds (say, F2). The offsets can be seen in both type 2 and type 3 interference patterns. An analysis of the shear fold model shows that there is a maximum limit for the magnitude of side-stepping. The side-stepping is larger for larger interlimb angles of F1. It decreases with progressive tightening of F2. By recognizing such side-stepping we can predict on which side the F1 hinge should lie even if the hinge is unexposed or lies outside the domain of observation. The general rule for the sense of side-stepping is the same for shear folds, flexural slip folds and buckling folds. However, the side-stepping in buckling folds should be used with caution, since F2 folds on buckled single-layers may show an offset whose sense is opposite to that predicted by the general rule.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Superposed Folding; Axial Surfaces; Side-stepping
ID Code:27151
Deposited On:08 Dec 2010 12:37
Last Modified:17 May 2016 10:25

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