DOI: 10.1016/j.quascirev.2014.12.010
Scopus记录号: 2-s2.0-84922991592
论文题名: Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum
作者: Praeg D. ; McCarron S. ; Dove D. ; Ó Cofaigh C. ; Scott G. ; Monteys X. ; Facchin L. ; Romeo R. ; Coxon P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 111 起始页码: 107
结束页码: 112
语种: 英语
英文关键词: British-irish ice sheet
; Celtic sea
; Cockburn bank
; Glacigenic sediments
; Heinrich event 2
; Last glacial maximum
Scopus关键词: Glacial geology
; Glaciers
; Sediments
; British-Irish ice sheet
; Celtic seas
; Cockburn bank
; Glacigenic sediments
; Heinrich Events
; Last Glacial Maximum
; Ice
; continental shelf
; glaciomarine deposit
; Heinrich event
; ice sheet
; Last Glacial Maximum
; sediment core
; shelf break
; Atlantic Ocean
; Celtic Sea
; Irish Sea
; Mollusca
英文摘要: Previous reconstructions of the British-Irish Ice Sheet (BIIS) envisage ice streaming from the Irish Sea to the Celtic Sea at the Last Glacial Maximum, to a limit on the mid-shelf of the Irish-UK sectors. We present evidence from sediment cores and geophysical profiles that the BIIS extended 150km farther seaward to reach the continental shelf edge. Three cores recently acquired from the flank of outer Cockburn Bank, a shelf-crossing sediment ridge, terminated in an eroded glacigenic layer including two facies: overconsolidated stratified diamicts; and finely-bedded muddy sand containing micro- and macrofossil species of cold water affinities. We interpret these facies to result from subglacial deformation and glacimarine deposition from turbid meltwater plumes. A date of 24,265±195calBP on a chipped but unabraded mollusc valve in the glacimarine sediments indicates withdrawal of a tidewater ice sheet margin from the shelf edge by this time, consistent with evidence from deep-sea cores for ice-rafted debris peaks of Celtic Sea provenance between 25.5 and 23.4kaBP. Together with terrestrial evidence, this supports rapid (ca2ka) purging of the BIIS by an ice stream that advanced from the Irish Sea to the shelf edge and collapsed back during Heinrich event 2. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60016
Appears in Collections: 过去全球变化的重建
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作者单位: OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Borgo Grotta Gigante 42C, Trieste, Italy; Maynooth University Department of Geography, Maynooth, Co. Kildare, Ireland; British Geological Survey, Murchison House, West Mains Road, Edinburgh, Scotland, United Kingdom; Department of Geography, Durham University, Durham, United Kingdom; Geological Survey of Ireland, Beggars Bush, Haddington Road, Dublin, Ireland; Department of Geography, Trinity College, Dublin, Ireland
Recommended Citation:
Praeg D.,McCarron S.,Dove D.,et al. Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum[J]. Quaternary Science Reviews,2015-01-01,111