Microstructure and texture in experimentally folded single-layer rock salt

Gairola, V. K. and Kern, H. (1984) Microstructure and texture in experimentally folded single-layer rock salt Journal of Structural Geology, 6 (1-2). pp. 201-213. DOI 10.1016/0191-8141(84)90097-x.

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Abstract

Buckling experiments on single-layers of fine-grained artificial polycrystalline rock salt embedded in a plasticine matrix have been performed in the temperature range of 185-200°C under a confining pressure of 10 bars, in a plane strain pure shear apparatus. Strain rates ranged from 2.5 × 10-7 to 4.7 × 10-7. Layers with an aspect ratio of 7 deformed without buckling, but when this ratio was increased to 13, layers deformed by buckling and produced one wavelength of a sinusoidal fold. The stress-strain and time-strain curves indicate that folding is initiated at about 7 to 8% of bulk deformation. The layer-parallel shortening and thickening continues with progressive folding. The changes in the arclength, thickness, and limb dip show that initially the fold growth is slow, and then becomes rapid. The inner fold are is characterized by strong preferred dimensional grain orientation with the longer axis normal to the layer surface. The axial ratio of grains gradually decreases towards the outer arc. The stresses on the outer are have been relieved mainly by the development of tension fractures. In the limbs, the grains are elongated normal to the layer, however, close to the surfaces the grains are very fine and exhibit a tendency to elongate along the layer surface. The preferred lattice orientation of (100), (110) and (111) planes in halite have been determined by X-ray texture goniometry, and the pole figures are partially comparable to the textures in natural fold from salt domes.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/0191-8141(84)90097-x
ISSN: 0191-8141
Date Deposited: 02 Feb 2012 09:32
Last Modified: 08 Oct 2012 07:33
URI: http://eprints.uni-kiel.de/id/eprint/15512

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