Abstract
The nodular anhydrite of many sedimentary basins has been deformed by halokinesis, ductile faulting and regional folding. Deformed nodular anhydrite is common and particularly well exposed in the east-central Sverdrup Basin, Axel Heiberg Island, Canadian Arctic. Large oriented specimens containing closely-packed nodules were collected on this island and used for a pilot study of the state of paleostrain. Owing to the asymmetry of many anhydrite nodules, Robin's method of strain analysis is better suited than most other techniques. Diameter ratios in about 50 nodule sections must be determined per deformation plane to achieve a reasonable analytical precision. Given the attitude of bedding and its stratigraphie facing, one can split the total strain into two finite increments, 1. (1) an apparent or real compaction 2. (2) the tectonic strain. In view of the ubiquity of nodular anhydrite rocks in typical sedimentary piles, the procedures described in this paper should be applicable in many regions.
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