Abstract
During the refolding of an early non-isoclinal fold (say,F 1) we may find an offset or side-stepping of the axial surfaces of the later folds (say,F 2). 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 ofF 1. It decreases with progressive tightening ofF 2. 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, sinceF 2 folds on buckled single-layers may show an offset whose sense is opposite to that predicted by the general rule.
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References
Ghosh S K 1993Structural Geology: Fundamentals and Modern Developments (Oxford: Pergamon Press) 598 PP
Ghosh S K, Mandai N, Khan D and Deb S 1992 Modes of superposed buckling in single layers controlled by initial tightness of early folds;J. Struct. Geol. 14 381–394
Ghosh S K, Mandai N, Sengupta Sudipta, Deb S and Khan D 1993 Superposed buckling in multilayers;J. Struct. Geol. 15 95–111
Ramsay J G 1967Folding and Fracturing of Rocks (New York: McGraw-Hill) 568 pp
Ramsay J G and Huber M I 1987The Techniques of Modern Structural Geology. 2. Folds and Fractures. (London: Academic Press) 307 pp
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Ghosh, S.K. Side-stepping of axial surface traces in superposed folding. Proc. Indian Acad. Sci. (Earth Planet Sci.) 104, 373–383 (1995). https://doi.org/10.1007/BF02843403
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DOI: https://doi.org/10.1007/BF02843403