Fold interference structures: The influence of layer competence contrast

Lisle, Richard John, Styles, P. and Freeth, S. J. 1990. Fold interference structures: The influence of layer competence contrast. Tectonophysics 172 (3-4) , pp. 197-200. 10.1016/0040-1951(90)90029-8

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Abstract

Using the geometrical properties of curved surfaces it can be predicted that the geometries of natural refolded folds should differ from the well-known forms resulting from superposed shear folds if the sequence undergoing folding contains competent horizons. The simple dome-and-basin patterns, expected from kinematic considerations, are incompatible with constant bed length folding (isometric deformation). Isometric deformation requires that a flat sheet folds to give a surface consisting of points of zero Gaussian curvature like, for example, the surfaces of cylindrical and conical folds. We suggest that the coaptation folds recently recognized by Stauffer (1988) are topologically-necessary crumples on the flanks of domes and basins, rather than bends at the intersection of two oblique intersecting folds and should be known as curvature-accommodation folds.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	Q Science > QE Geology
Publisher:	Elsevier
ISSN:	0040-1951
Last Modified:	04 Jun 2017 02:10
URI:	https://orca.cardiff.ac.uk/id/eprint/10461

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