Single-layer folding in marble and limestone: An experimental study

Gairola, V. K. and Kern, H. (1984) Single-layer folding in marble and limestone: An experimental study Tectonophysics, 108 (1-2). pp. 155-172. DOI 10.1016/0040-1951(84)90158-6.

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Supplementary data:


Folding experiments have been carried out on single-layers of Carrara marble and Solnhofen limestone at a confining pressure of 275 bars, temperature of 400°C, and strain rates of 5.5×10-7 to 8.2×10-7. The marble and limestone layers were embedded in a rock-salt matrix and in a matrix of a mixture of 60% fine-grained halite and 40% fine-grained calcite, respectively, and deformed to different percentages of bulk shortening. Aspect ratios of the layers varied between 11.25 and 15. The stress-strain relationship reveals that strain increased with a very small increment in compressive stresses, once folding was initiated. With progressive deformation the bulk strain is compensated by folding along one fold hinge. The resulting folds are concentric and a combination of class 1a, 1b and 3 type. The changes in the arc length, layer thickness, limb dip and wavelength with progressive folding in marble layers, are discussed. The microstructure and texture of the folded marble and limestone layers have been investigated optically and by means of an X-ray texture goniometer. The inner fold arc exhibits a strong preferred orientation, whereas in the outer fold are the preferred orientation is poorly developed. Differences in the fabric in medium-grained marble and fine-grained limestone layers have been attributed to the difference in mechanism of deformation.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/0040-1951(84)90158-6
ISSN: 0040-1951
Date Deposited: 02 Feb 2012 09:32
Last Modified: 08 Oct 2012 07:33

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