3D seismic imaging of the shallow plumbing system beneath the Ben Nevis Monogenetic Volcanic Field: Faroe-Shetland Basin

McLean, C. E., Schofield, N., Brown, D. J. , Jolley, D. W. and Reid, A. (2017) 3D seismic imaging of the shallow plumbing system beneath the Ben Nevis Monogenetic Volcanic Field: Faroe-Shetland Basin. Journal of the Geological Society, 174, pp. 468-485. (doi:10.1144/jgs2016-118)

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Abstract

Seismic reflection data allow for the 3D imaging of monogenetic edifices and their corresponding plumbing systems. This is a powerful tool in understanding how monogenetic volcanoes are fed and how pre-existing crustal structures can act as the primary influence on their spatial and temporal distribution. This study examines the structure and lithology of host-rock as an influence on edifice alignment and provides insight into the structure of shallow, sub-volcanic monogenetic plumbing systems. The anticlinal Ben Nevis Structure, located in the northerly extent of the Faroe–Shetland Basin, NE Atlantic Margin, was uplifted during the Late Cretaceous and Early Paleocene by the emplacement of a laccolith and a series of branching sills fed by a central conduit. Seismic data reveal that multiple intrusions migrated up the flanks of the Ben Nevis Structure after its formation, c. 58.4 Ma (Kettla-equivalent), and fed a series of scoria cones and submarine volcanic cones. These monogenetic edifices are distributed around the crest of the Ben Nevis Structure. The edifices are fed from a complex network of sills and transgressive sheets, involving lateral magma migration of tens of kilometres before extrusion at the surface. This work highlights the importance of underlying basin structures in influencing the sites and development of subaerial monogenetic fields, and the importance of lateral magma flow within volcanic systems.

Item Type:Articles
Additional Information:This work was completed as part of CM’s PhD research, funded by a College of Science and 604 Engineering PhD scholarship at the University of Glasgow.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Brown, Dr David and Mclean, Miss Charlotte
Authors: McLean, C. E., Schofield, N., Brown, D. J., Jolley, D. W., and Reid, A.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Journal of the Geological Society
Publisher:Geological Society of London
ISSN:0016-7649
ISSN (Online):2041-479X
Published Online:27 January 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Journal of the Geological Society 174:468-485
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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