Domainal deformation patterns and strain partitioning during transpression; an example from the Southern Uplands terrane, Scotland

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doi: 10.1144/0016-764901-123
Authors:Holdsworth, R. E.; Tavarnelli, E.; Clegg, P.; Pinheiro, R. V. L.; Jones, R. R.; McCaffrey, K. J. W.
Author Affiliations:Primary:
University of Durham, Department of Geological Sciences, Durham, United Kingdom
Other:
Universita di Siena, Italy
Universidade Federal do Para, Brazil
CognIT, Norway
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.159(Part 4), p.401-415. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:2002
Note:In English. 60 refs.; illus., incl. 1 table, sketch map
Summary:The partitioning of deformation into wrench- and contraction-dominated deformation domains is a widely reported but poorly described phenomenon in ancient transpression zones. This paper documents spectacularly exposed examples of such partitioning from the Southern Uplands terrane in SE Scotland (Berwickshire), which was deformed during late Llandovery to Wenlock time. A well-exposed coastal section from Eyemouth to Burnmouth preserves a broadly homoclinal sequence in which a highly heterogeneous array of contemporaneous structures formed during regional triclinic transpression. The deformation involved components of NW-SE contraction with subvertical extension, top-to-the-SE thrusting and top-to-the-SW sinistral shear. In the northern third of the section studied these components are partitioned into a series of fault-bounded, metre- to kilometre-scale structural domains that contain geometrically and kinematically distinct assemblages of variably curvilinear folds, strike-slip detachments and locally transecting cleavages. The structures are all broadly contemporaneous and, in individual domains, record either non-coaxial contractional- or sinistral wrench-dominated strains. Similar highly heterogeneous, domainal structural patterns are likely to be found in other regions of oblique convergence in both ancient and modern settings.
Sections:Petrology
Subsections:General
Subjects:Axial-plane structures; Bedding; Cleavage; Deformation; Domains; Faults; Folds; Foliation; Lower Paleozoic; Paleozoic; Planar bedding structures; Preferred orientation; Sedimentary structures; Strain; Structural analysis; Tectonics; Terranes; Three-dimensional models; Transpression; Caledonides; Europe; Great Britain; Scotland; Southern Uplands; United Kingdom; Western Europe
Coordinates:N544000 N560000 W0004500 W0083000
Abstract Numbers:02M/4511
Record ID:2002054636
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
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