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Seismic and borehole-based mapping of the Late Carboniferous succession in the Canonbie Coalfield, SW Scotland; evidence for a 'broken' Variscan foreland?

Louis Howell, Bernard Besly, Surika Sooriyathasan, Stuart Egan and Graham Leslie
Seismic and borehole-based mapping of the Late Carboniferous succession in the Canonbie Coalfield, SW Scotland; evidence for a 'broken' Variscan foreland?
Scottish Journal of Geology (September 2020) 57 (1)

Abstract

Local seismic and borehole-based mapping of the Carboniferous Pennine Coal Measures and Warwickshire Group successions in the Canonbie Coalfield (SW Scotland) provides evidence of repeated episodes of positive inversion, syn-depositional folding and unconformities. A Duckmantian (Westphalian B) episode of NE-SW transpression is recognised, based on onlapping seismic reflector geometries against NE-trending positive inversion structures and contemporaneous NNE-trending syn-depositional growth folding. The basin history thus revealed at Canonbie is at variance with generally accepted models in neighbouring northern England that imply subsidence was due to post-rift thermal subsidence during late Carboniferous times. A late Westphalian-Stephanian unconformity recognised within the Warwickshire Group succession signifies NW-SE, c. 10% local basin shortening during a time of major shortening in the late Carboniferous Variscan foreland, contradicting suggestions that maximum Variscan shortening had negligible impact on Carboniferous basins in northern Britain. Local inversion structures appear to have strongly influenced local late Westphalian-Stephanian depocentres. In this respect, the Variscan foreland at Canonbie may have resembled a 'broken' foreland system. Variations in crustal rheology, fault strength and orientation, and mid-crustal detachments are suggested to have played important roles in determining strain localisation and the nature of Westphalian-Stephanian depocentres in the Canonbie Coalfield.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 57
Serial Issue: 1
Title: Seismic and borehole-based mapping of the Late Carboniferous succession in the Canonbie Coalfield, SW Scotland; evidence for a 'broken' Variscan foreland?
Affiliation: Keele University, School of Geography, Geology and the Environment, Staffordshire, United Kingdom
Published: 20200910
Text Language: English
Publisher: Geological Society Publishing House for the Geological Societies of Edinburgh and Glasgow, Bath, United Kingdom
References: 88
Accession Number: 2020-077256
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., geol. sketch map
N55°04'00" - N55°04'00", W02°57'00" - W02°57'00"
Secondary Affiliation: British Geological Survey, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202047
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