DOI: 10.1016/j.quascirev.2015.09.015
Scopus记录号: 2-s2.0-84942582468
论文题名: Maximum extent and dynamic behaviour of the last British-Irish Ice Sheet west of Ireland
作者: Peters J.L. ; Benetti S. ; Dunlop P. ; Ó Cofaigh C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 128 起始页码: 48
结束页码: 68
语种: 英语
英文关键词: Benthic foraminifera
; British-irish ice sheet
; Continental shelf
; Geomorphology
; Ice shelf
; Marine-terminating ice margin
; Maximum extent
; Porcupine bank
; Radiocarbon
; Sedimentology
Scopus关键词: Geomorphology
; Glacial geology
; Glaciers
; Sedimentology
; Benthic foraminifera
; British-Irish ice sheet
; Continental shelves
; Ice shelves
; Marine-terminating ice margin
; Maximum extent
; Porcupine bank
; Radiocarbon
; Ice
; benthic foraminifera
; continental shelf
; deglaciation
; Devensian
; geomorphology
; glacial landform
; ice margin
; ice sheet
; ice shelf
; last glaciation
; paleontology
; radiocarbon dating
; reconstruction
; sediment core
; sedimentology
; Atlantic Ocean
; Ireland
; Porcupine Bank
; United Kingdom
; Foraminifera
英文摘要: A complete reconstruction of the last British-Irish Ice Sheet (BIIS) is hindered by uncertainty surrounding its offshore extent and dynamic behaviour. This study addresses this problem by reconstructing the depositional history of four sediment cores taken from a series of sinuous glacigenic sediment ridges on the continental shelf west of Ireland. We present new geomorphic, sedimentary and micropaleontological data that record a maximum westward BIIS extent that was at least 80 km farther offshore from any previous estimates. The data suggests that a large ice shelf formed over parts of the shelf prior to retreat. This new data increases the areal extent of grounded BIIS ice by ~6700 km2 from previous estimates, which represents a ~3% increase in the Irish Sector of the ice sheet. Three new AMS radiocarbon dates demonstrate for the first time that the BIIS advanced to the shelf edge during last glaciation (Late Midlandian/Late Devensian), with ice advance onto the Porcupine Bank occurring after 24,720 ± 260 yr Cal. BP. Deglaciation was complete by 19,182 ± 155 yr Cal. BP, thus constraining BIIS occupation over the Porcupine Bank to less than 5500 years. Estimated retreat rates of marine-terminating ice across the shelf range from ~70 to 180 myr-1. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59783
Appears in Collections: 过去全球变化的重建
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作者单位: School of Environmental Sciences, University of Ulster, Cromore Road, Coleraine, Northern Ireland, United Kingdom; Department of Geography, Durham University, Durham, United Kingdom
Recommended Citation:
Peters J.L.,Benetti S.,Dunlop P.,et al. Maximum extent and dynamic behaviour of the last British-Irish Ice Sheet west of Ireland[J]. Quaternary Science Reviews,2015-01-01,128