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A record of Eocene (Stronsay Group) sedimentation in BGS borehole 99/3, offshore NW Britain: implications for early post-break-up development of the Faroe-Shetland Basin

Stoker, Martyn; Leslie, Alick; Smith, Kevin. 2013 A record of Eocene (Stronsay Group) sedimentation in BGS borehole 99/3, offshore NW Britain: implications for early post-break-up development of the Faroe-Shetland Basin. Scottish Journal of Geology, 49 (2). 133-148. 10.1144/sjg2013-001

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Abstract/Summary

A punctuated Eocene succession has been recovered in British Geological Survey borehole 99/3 from the Faroe-Shetland Basin. The borehole was drilled close to the crest of the Judd Anticline and penetrated 110.5 m into the post-breakup Stronsay Group. The borehole proved 23.8 m of Ypresian–earliest Lutetian paralic to shallow-marine deposits, unconformably overlain by 43.85 m of mid-Lutetian lower shoreface to shallow-marine shelf deposits, in turn unconformably overlain by 42.85 m of late Bartonian–Priabonian mass-flow (slope apron) and basinal deposits. At the borehole site, the Ypresian–earliest Lutetian sediments were subaerially exposed in early Lutetian times; these deposits were subsequently transgressed by the mid-Lutetian shelf – itself eroded in the late Lutetian with reworked material transported northwards and redeposited in the Mid-Eocene basin-floor fan complex in Quadrants 213 and 214. The eroded mid-Lutetian shelf was subsequently downlapped and buried beneath prograding late Bartonian–Priabonian slope apron-to-basinal sediments as the borehole site subsided. Integrating the borehole data with the regional seismic-stratigraphy indicates three major intervals of regression – early/mid-Lutetian, late Lutetian and late Bartonian – which, it is suggested, coincide predominantly with tectonic activity, particularly compressional deformation, possibly linking the early post- breakup development of the Faroe-Shetland Basin to the evolution of the adjacent Norwegian Basin.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1144/sjg2013-001
ISSN: 0036-9276
NORA Subject Terms: Earth Sciences
Marine Sciences
Date made live: 21 Nov 2013 15:25 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/503062

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