Evidence for Caledonian sinistral strike-slip motion and associated fault zone weakening, Outer Hebrides fault zone, NW Scotland

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doi: 10.1144/gsjgs.152.5.0743
Authors:Butler, C. A.; Holdsworth, R. E.; Strachan, R. A.
Author Affiliations:Primary:
University of Durham, Department of Geological Sciences, Durham, United Kingdom
Other:
Oxford Brookes University, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.152(Part 5), p.743-746. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1995
Note:In English. 22 refs.; illus., incl. 1 table, geol. sketch map
Summary:This major ESE-dipping reactivated fault within the Lewisian gneisses has early thrust structures overprinted by a network of retrograde ductile shear zones in which channelling has hydrated the pre-existing basement rocks at low T, forming chlorite-white mica phyllonites in regions of highest strain. Strike-parallel mineral lineations and shear-sense indicators suggest sinistral displacements that are thought to be late Caledonian, based on isotopic data and regional considerations. The phyllonites have focused extensional movements that overprint strike-slip fabrics and may control the locations of the Mesozoic Sea of the Hebrides and Minch basins. [R.A.H.]
Subjects:Caledonian Orogeny; Fault zones; Faults; Metamorphic rocks; Paleozoic; Phyllonites; Reactivation; Shear zones; Strike-slip faults; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Northwestern Scotland; Outer Hebrides fault zone
Abstract Numbers:96M/950
Record ID:1996011175
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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