Complex deformation as a result of strain partitioning in transpression zones; an example from the Leinster Terrane, SE Ireland

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doi: 10.1144/0016-764903-177
Authors:Clegg, P.; Holdsworth, R. E.
Author Affiliations:Primary:
University of Durham, Department of Earth Sciences, Durham, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 162(1), p.187-202. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:2005
Note:In English. 61 refs.; illus., incl. block diags., 1 table, geol. sketch maps
Summary:Coastal exposures of Lower Palaeozoic rocks in SE Ireland provide an excellent opportunity to study structures formed during the sinistrally oblique Early Devonian Acadian orogeny. A highly heterogeneous assemblage of broadly contemporaneous Acadian structures is preserved and includes complex curvilinear folds, a regional, slightly clockwise transecting pressure solution cleavage, and networks of regional and smaller-scale sinistral shear zones and faults. The geometric and kinematic characteristics of these structures suggest components of NW-SE shortening, top-to-the-SW sinistral shear and a small component of top-to-the-SE thrusting. The structures are arranged into geometrically and kinematically different assemblages that define three fault-bounded structural domains, of hundreds of metres to kilometre scale. These are interpreted to result from the kinematic partitioning of the bulk triclinic sinistral transpressional strain into end-member monoclinic contraction- and wrench-dominated deformations. In this case, the nature and distribution of strain may be controlled by the presence of a pre-existing basin-bounding structure, the Courtown-Tramore Fault. The present study once again illustrates well how structural facing patterns can be used to unravel the structural complexities of kinematically partitioned transpression zones.
Subjects:Acadian Phase; Cleavage; Deformation; Faults; Folds; Foliation; Kinematics; Lower Paleozoic; Paleozoic; Shear zones; Structural analysis; Tectonics; Transpression; Europe; Ireland; Western Europe; Courtown-Tramore Fault; Leinster Terrane; Southeastern Ireland
Coordinates:N520000 N540000 W0060000 W0073000
Abstract Numbers:05M/59
Record ID:2005018251
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
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