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GEOREF RECORD

End of the Kiaman Superchron in the Permian of SW England; magnetostratigraphy of the Aylesbeare Mudstone and Exeter Groups

Mark W. Hounslow, Gregg McIntosh, Richard A. Edwards, Deryck J. C. Laming and Vassil Karloukovski
End of the Kiaman Superchron in the Permian of SW England; magnetostratigraphy of the Aylesbeare Mudstone and Exeter Groups
Journal of the Geological Society of London (July 2016) 174 (1): 56-74

Abstract

The chronology of Permian strata in SW England is fragmentary and largely based on radiometric dating of associated volcanic units. Magnetostratigraphy from the c. 2 km of sediments in the Exeter and Aylesbeare Mudstone groups was undertaken to define a detailed chronology, using the end of the Kiaman Superchron and the overlying reverse and normal polarity in the Middle and Upper Permian as age constraints. The palaeomagnetic directions are consistent with other European Permian palaeopoles, with data passing fold and reversal tests. The end of the Kiaman Superchron (in the Wordian) occurs in the uppermost part of the Exeter Group. The overlying Aylesbeare Mudstone Group is early Capitanian to latest Wuchiapingian in age. The Changhsingian and most of the Lower Triassic sequence is absent. Magnetostratigraphic comparison with the Southern Permian Basin shows that the Exeter and Aylesbeare Mudstone groups are closely comparable in age with the Havel and Elbe Subgroups of the Rotliegend II succession. The Altmark unconformities in these successions appear similar in age to the sequence boundaries in SW England, indicating that both may be climate controlled. Clasts in the Exeter Group, from unroofing of the Dartmoor Granite, first occurred at a minimum of c. 8 myr after formation of the granite. Supplementary material: Additional sampling, magnetic fabric and palaeomagnetic data are available at http://doi.org/10.6084/m9.figshare.c.3283400


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 174
Serial Issue: 1
Title: End of the Kiaman Superchron in the Permian of SW England; magnetostratigraphy of the Aylesbeare Mudstone and Exeter Groups
Affiliation: Lancaster University, Lancaster Environment Centre, Lancaster, United Kingdom
Pages: 56-74
Published: 20160722
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 102
Accession Number: 2016-087156
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N50°32'60" - N50°43'00", W03°31'60" - W03°17'60"
Secondary Affiliation: Canterbury Christ Church University, GBR, United KingdomHerrington Geoscience and David Roche GeoConsulting, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201643
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