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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doi: 10.1016/0191-8141(86)90101-X
Authors:Collins, Denis A.; de Paor, Declan G.
Author Affiliations:Primary:
Univ. Coll. Cork, Geol. Dep., Cork, United Kingdom
Other:
Johns Hopkins Univ., United States
Volume Title:Journal of Structural Geology
Source:Journal of Structural Geology, 8(2), p.101-109. Publisher: Pergamon, Oxford-New York, International. ISSN: 0191-8141
Publication Date:1986
Note:In English. 28 refs.; illus. incl. 2 plates, sect., sketch map
Summary:Units of openly folded Upper Palaeozoic sandstone and siltstone are traversed by closely spaced arrays of en-echelon quartz veins in the Hercynian fold belt near the town of Ardmore, County Waterford. These arrays mark the sites of shear zones which are bounded by weakly deformed wall-rocks. The attitude of cleavage and the sigmoidal shapes of the veins were used to calculate the cumulative shear strain across each zone; the bulk deformation suffered by the outcrop was then determined by tensor analysis, with the aid of an off-axis Mohr circle construction. It is concluded that, as a consequence of vein formation, the rocks at this outcrop suffered significant bulk deformation with an 8-14° clockwise rotation. [J.M.H.]
Subjects:Effects; Faults; Quantitative analysis; Rotation; Shear zones; Structural analysis; Structural geology; Variscan Orogeny; Veins; Europe; Ireland; Western Europe; Ardmore; Hercynian; Southern Ireland; Tensor analysis; Waterford
Abstract Numbers:86M/5047
Record ID:1986061382
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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