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.
Sections:Petrology
Subsections:General
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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100 1 |a Clegg, P.  |e analytic author  |u University of Durham, Department of Earth Sciences, Durham 
245 1 0 |a Complex deformation as a result of strain partitioning in transpression zones; an example from the Leinster Terrane, SE Ireland 
300 |a p. 187-202 
500 |a In English. 61 refs. 
500 |a Abstract number: 05M/59 
500 |a Category Section: Petrology 
500 |a Category Subsection: General 
500 |a Affiliation: University of Durham, Department of Earth Sciences; Durham; GBR; United Kingdom 
500 |a Key title: Journal of the Geological Society of London 
500 |a Source note: Journal of the Geological Society of London, 162(1), p.187-202. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 
500 |a Publication type: journal article 
504 |b 61 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom 
520 |a 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. 
650 7 |a Acadian Phase  |2 georeft 
650 7 |a Cleavage  |2 georeft 
650 7 |a Deformation  |2 georeft 
650 7 |a Faults  |2 georeft 
650 7 |a Folds  |2 georeft 
650 7 |a Foliation  |2 georeft 
650 7 |a Kinematics  |2 georeft 
650 7 |a Lower Paleozoic  |2 georeft 
650 7 |a Paleozoic  |2 georeft 
650 7 |a Shear zones  |2 georeft 
650 7 |a Structural analysis  |2 georeft 
650 7 |a Tectonics  |2 georeft 
650 7 |a Transpression  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Ireland  |2 georeft 
651 7 |a Western Europe  |2 georeft 
653 |a Courtown-Tramore Fault 
653 |a Leinster Terrane 
653 |a Southeastern Ireland 
700 1 |a Holdsworth, R. E.,  |e analytic author 
773 0 |t Journal of the Geological Society of London  |d London : Geological Society of London, Jan. 2005  |x 0016-7649  |y JGSLAS  |n Journal of the Geological Society of London, 162(1), p.187-202. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 Publication type: journal article  |g Vol. 162, no. 1  |h illus., incl. block diags., 1 table, geol. sketch maps 
856 |u urn:doi: 10.1144/0016-764903-177