Late Carboniferous to Triassic reactivation of Variscan basement in the western English Channel; evidence from onshore exposures in South Cornwall

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doi: 10.1144/gsjgs.154.1.0163
Authors:Shail, Robin K.; Alexander, Andrew C.
Author Affiliations:Primary:
University of Exeter, Camborne School of Mines, Redruth, United Kingdom
University of Durham, United Kingdom
Volume Title:role of basement reactivation in continental deformation
Volume Authors:Butler, R. W. H., editor; Holdsworth, R. E.; Lloyd, G. E.
Source:Journal of the Geological Society of London, Vol.154 (Part 1), p.163-168; Discussion meeting on The role of basement reactivation in continental deformation, Burlington House, United Kingdom, March 6-7, 1996, edited by R. W. H. Butler, R. E. Holdsworth and G. E. Lloyd. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1997
Note:In English. 26 refs.; illus., incl. sketch maps
Summary:S Cornwall represents the westernmost part of the Variscan basement massif in SW England. Field-based investigations of the distribution, geometry, kinematics and relative chronology of post-Variscan deformation in this area, accompanied by preliminary stress analyses, indicate three episodes of basement reactivation. These are: 1) Stephanian to early Permian NNW-SSE extension, 2) early to late Permian strike-slip deformation and 3) late Permian to Triassic ENE-WSW extension. The data have been used to test and refine previously published models, based on seismic and well-data, of late Carboniferous to Triassic basement reactivation and sedimentary basin development within the Western Approaches Trough. It is confirmed that NNW-SSE regional extension and reactivation of ENE-striking Variscan thrusts had been initiated before the latest Carboniferous, and that ENE-WSW regional extension and dip-slip reactivation of NNW-striking high-angle faults occurred during the Triassic. The Permian strike-slip deformation recognized onshore may have contributed to the development of widespread unconformities within the offshore basins. [R.A.H.]
Subjects:Basement; Basement tectonics; Carboniferous; Deformation; Extension tectonics; Faults; Mesozoic; Orogeny; Paleozoic; Reactivation; Tectonics; Triassic; Upper Carboniferous; Variscan Orogeny; Atlantic Ocean; Cornwall England; England; English Channel; Europe; Great Britain; North Atlantic; United Kingdom; Western Europe
Abstract Numbers:97M/3016
Record ID:1997056642
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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