dc.contributor.author | Lockhart, EA | |
dc.contributor.author | Scourse, JD | |
dc.contributor.author | Praeg, D | |
dc.contributor.author | Van Landeghem, KJJ | |
dc.contributor.author | Mellett, C | |
dc.contributor.author | Saher, M | |
dc.contributor.author | Callard, L | |
dc.contributor.author | Chiverrell, RC | |
dc.contributor.author | Benetti, S | |
dc.contributor.author | Cofaigh, C | |
dc.contributor.author | Clark, CD | |
dc.date.accessioned | 2018-09-24T14:35:53Z | |
dc.date.issued | 2018-09-10 | |
dc.description.abstract | The Celtic Sea contains the world's largest continental shelf sediment ridges. These megaridges were initially interpreted as tidal features formed during post-glacial marine transgression, but glacigenic sediments have been recovered from their flanks. We examine the stratigraphy of the megaridges using new decimetric-resolution geophysical data correlated to sediment cores to test hypothetical tidal vs glacial modes of formation. The megaridges comprise three main units, 1) a superficial fining-upward drape that extends across the shelf above an unconformity. Underlying this drape is 2), the Melville Formation (MFm) which comprises the upper bulk of the megaridges, sometimes displaying dipping internal acoustic reflections and consisting of medium to coarse sand and shell fragments; characteristics consistent with either a tidal or glacifluvial origin. The MFm unconformably overlies 3), the Upper Little Sole Formation (ULSFm), previously interpreted to be of late Pliocene to early Pleistocene age, but here shown to correlate to Late Pleistocene glacigenic sediments forming a precursor topography. The superficial drape is interpreted as a product of prolonged wave energy as tidal currents diminished during the final stages of post-glacial marine transgression. We argue that the stratigraphy constrains the age of the MFm to between 24.3 and 14 ka BP, based on published dates, coeval with deglaciation and a modelled period of megatidal conditions during post-glacial marine transgression. Stratigraphically and sedimentologically, the megaridges could represent preserved glacifluvial features, but we suggest that they comprise post-glacial tidal deposits (MFm) mantling a partially-eroded glacial topography (ULSFm). The observed stratigraphy suggests that ice extended to the continental shelf-edge. | en_GB |
dc.description.sponsorship | This work and E Lockhart were funded by the UK Natural Environment Research Council and the British Geological Survey (Ph.D. studentship 1647721) through the ENVISION doctoral training and Collaborative Awards in Science and Engineering partnerships. Data were acquired during campaigns for the BRITICE-CHRONO project (NERC consortium grant NE/J009768/1), and the OGS project IPY GLAMAR awarded to D Praeg by the Italian polar research agency (PNRA grant 2009/A2.15). D Praeg was further supported by funding from the European Union's Horizon 2020 research and innovation program under Marie Skłodowska-Curie grant agreement No. 656821. The research survey CV14007 was carried out under the Sea Change Strategy with the support of the Marine Institute and the Marine Research Sub-programme of the National Development Plan 2007–2013. | en_GB |
dc.identifier.citation | Vol. 198, pp. 156 - 170 | en_GB |
dc.identifier.doi | 10.1016/j.quascirev.2018.08.029 | |
dc.identifier.uri | http://hdl.handle.net/10871/34095 | |
dc.language.iso | en | en_GB |
dc.publisher | Elsevier | en_GB |
dc.rights | © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). | en_GB |
dc.subject | Holocene | en_GB |
dc.subject | Late Pleistocene | en_GB |
dc.subject | Western Europe | en_GB |
dc.subject | Celtic sea | en_GB |
dc.subject | Stratigraphy | en_GB |
dc.subject | Glaciation | en_GB |
dc.subject | Tidal sand ridges | en_GB |
dc.subject | Irish sea ice stream | en_GB |
dc.title | A stratigraphic investigation of the Celtic Sea megaridges based on seismic and core data from the Irish-UK sectors | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2018-09-24T14:35:53Z | |
dc.identifier.issn | 0277-3791 | |
dc.description | This is the final version of the article. Available from Elsevier via the DOI in this record. | en_GB |
dc.description | Supplementary data related to this article can be found athttps://doi.org/10.1016/j.quascirev.2018.08.029 | en_GB |
dc.identifier.journal | Quaternary Science Reviews | en_GB |