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Total bulk strain in flattened parallel folds

Aller, Jesus, Bobillo-Ares, Nilo, Bastida, Fernando and Lisle, Richard 2008. Total bulk strain in flattened parallel folds. Journal of Structural Geology 30 (7) , pp. 827-838. 10.1016/j.jsg.2008.03.005

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A new simple method is proposed to analyse the total bulk shortening in flattened parallel folds. Application of the method requires determining first the amount of flattening using any of the available techniques or by using a new method proposed in this paper. Then, some shape information must be obtained from the fold, such as the interlimb angle or the aspect ratio, as well as the eccentricity of the conic section that gives the best fit to the midline of the folded layer. The latter parameter can be obtained using the program “Fold Profiler”. Finally, the flattening and the shape data are used to obtain the total bulk shortening of the folded layer. A computer code is provided that performs these calculations. The method does not consider the initial layer shortening prior to buckling and therefore gives an estimate of the minimum bulk shortening associated with the fold. The strain data obtained with this method are not point values from selected locations inside the folded structure, but an overall evaluation of its bulk strain that can be advantageously used in the regional interpretation. The analysis is two-dimensional and only considers deformation in the fold profile plane. The study is completed with an example of the application of the method to natural folds.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: Fold flattening; Buckling; Strain; Mathematical modelling
Publisher: Elsevier
ISSN: 0191-8141
Last Modified: 04 Jun 2017 02:09

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