globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2018.08.029
Scopus记录号: 2-s2.0-85053030634
论文题名:
A stratigraphic investigation of the Celtic Sea megaridges based on seismic and core data from the Irish-UK sectors
作者: Lockhart E.A.; Scourse J.D.; Praeg D.; Van Landeghem K.J.J.; Mellett C.; Saher M.; Callard L.; Chiverrell R.C.; Benetti S.; Cofaigh C.Ó.; Clark C.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 198
起始页码: 156
结束页码: 170
语种: 英语
英文关键词: Celtic sea ; Glaciation ; Holocene ; Irish sea ice stream ; Late Pleistocene ; Stratigraphy ; Tidal sand ridges ; Western Europe
Scopus关键词: Glacial geology ; Ocean currents ; Sea ice ; Sediments ; Tidal power ; Wave energy conversion ; Celtic seas ; Glaciation ; Holocenes ; Ice streams ; Late Pleistocene ; Tidal sand ridges ; Western Europe ; Stratigraphy ; continental shelf ; deglaciation ; glaciation ; glaciofluvial deposit ; Holocene ; Pleistocene ; Pliocene ; Pliocene-Pleistocene boundary ; Postglacial ; sea ice ; shelf break ; shelf sediment ; stratigraphy ; transgression ; Atlantic Ocean ; Celtic Sea ; Irish Sea ; United Kingdom ; Western Europe
英文摘要: 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. © 2018 The Authors
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112041
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


作者单位: School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, United Kingdom; College of Life and Environmental Sciences, University of Exeter, Penryn, Cornwall, TR10 9EZ, United Kingdom; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Borgo Grotta Gigante, Trieste, Italy; Géoazur (UMR 7329 CNRS), Rue Albert EinsteinValbonne 06560, France; Wessex Archaeology, Portway House, Old Sarum Park, Salisbury, Wiltshire SP4 6EB, United Kingdom; Department of Geography, Durham University, Lower Mountjoy, South Road, Durham, DH1 3LE, United Kingdom; Department of Geography and Planning, University of Liverpool, Liverpool, L69 3BX, United Kingdom; School of Geography and Environmental Sciences, Ulster University, Coleraine, Londonderry, BT52 1SA, United Kingdom; Department of Geography, Sheffield University, Sheffield, S10 2TN, United Kingdom; Laboratório de Geologia Marinha, Universidade Federal Fluminense, Av. Gen. Milton Tavares de Souza s.n., Gragoatá, Niterói, RJ 242103–46, Brazil

Recommended Citation:
Lockhart E.A.,Scourse J.D.,Praeg D.,et al. A stratigraphic investigation of the Celtic Sea megaridges based on seismic and core data from the Irish-UK sectors[J]. Quaternary Science Reviews,2018-01-01,198
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Lockhart E.A.]'s Articles
[Scourse J.D.]'s Articles
[Praeg D.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Lockhart E.A.]'s Articles
[Scourse J.D.]'s Articles
[Praeg D.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Lockhart E.A.]‘s Articles
[Scourse J.D.]‘s Articles
[Praeg D.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.