ABSTRACT
A range of transpressional structures in coal mines is described, for which three-dimensional data are available. Each structure is in a region which has undergone transpression. Differences between the structures are related to differences in the ratio of pure shear to simple shear. The fault network in Longquan coal mine, Shandong Province is dominated by contraction. The tight and narrow en echelon folds in Nantong coal mine, Sichuan Province and the oblique-slip duplex in Jiulonggang coal mine, Anhui Province show approximately equal amounts of simple shear and pure shear. The positive flower structure in Longwangdong coal mine, Sichuan Province and the faults and folds in Jingxing coal mine, Hebei Province are dominated by shear. Sigmoidal structure in Baishan coal mine, Anhui Province was caused by transpression and a simultaneous torsion, with a much higher proportion of shear than contraction. Examples are given of similar transpressional structures elsewhere in the world.
