A determination of the bulk rotational deformation resulting from displacements in discrete shear zones in the Hercynian Fold Belt of South Ireland |
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| Affiliation: | 1. Soil and Water Department, Estación Experimental de Aula Dei (EEAD), Spanish National Research Council (CSIC), Montañana Av. 1005, 50059 Zaragoza, Spain;2. Agrarian and Natural Environment Sciences Department, University of Zaragoza (UZ), Carretera Cuarte s/n 22071 Huesca, Spain;3. Crop and Forest Sciences Department, EEAD-CSIC Associated Unit, Agrotecnio Center, University of Lleida (UdL), Alcalde Rovira Roure Av. 191, 25198 Lleida, Spain;1. Department of Biostatistics and Epidemiology, Faculty of Public Health, Kerman University of Medical Sciences, Haft Bagh Alavi Blvd., Kerman, Iran;2. Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran;3. Consultation Center, Tehran Education and Training Organization, Tehran, Iran;4. Driving Research Group, Cranfield University, UK |
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| Abstract: | In the Hercynian Fold Belt of South Ireland, near the town of Ardmore, County Waterford, units of openly folded Upper Palaeozoic sandstone and siltstone are traversed by closely spaced arrays of en échelon quartz veins. These arrays mark the sites of shear zones which are bounded by weakly deformed wall rocks. We used the attitude of cleavage and the sigmoidal shapes of veins to calculate the cumulative shear strain across each zone, and then determined the bulk deformation suffered by the outcrop by tensor analysis, with the aid of an off-axis Mohr circle construction. We conclude that, as a consequence of vein formation, the rocks at this outcrop suffered significant bulk deformation with an 8–14° clockwise rotation. |
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