DOI: 10.1016/j.quascirev.2013.08.019
Scopus记录号: 2-s2.0-84894113586
论文题名: Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: Detecting and modelling changing sediment sources
作者: Andrews J.T. ; Bigg G.R. ; Wilton D.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 91 起始页码: 204
结束页码: 217
语种: 英语
英文关键词: East Greenland
; Holocene
; Ice bergs
; Ice-rafting
; Iceland
Scopus关键词: Minerals
; Sediment transport
; Sedimentation
; Glaciated margins
; Greenland
; Holocenes
; Ice-rafted sediments
; Ice-rafting
; Icelands
; Sediment fraction
; Sediment unmixing model
; Sea ice
英文摘要: We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define potential sediment sources, and these are examined within the context of the down-core variations in mineralogy in the <2mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment <2mm off NW and N Iceland exported across Denmark Strait; this averaged between 10 and 20%. Both the sediment unmixing model and the coupled iceberg-ocean model are consistent in finding that the fraction of "far-travelled" sediments in the Denmark Strait environs is overwhelmingly of local, mid-East Greenland, provenance, and therefore with a significant cross-channel component to their travel. The Holocene record of ice-rafted sediments denotes a three-part division of the Holocene in terms of iceberg sediment transport with a notable increase in the process starting ca 4000cal yr BP. This latter increase may represent the re-advance during the Neoglacial period of land-terminating glaciers on the Geikie Plateau to become marine-terminating. The contrast in spectral signals between these cores and the 1500-yr cycle at VM28-14, just south of the Denmark Strait, combined with the coupled iceberg-model results, leads us to speculate that the signal at VM28-14 reflects pulses in overflow waters, rather than an ice-rafted signal. © 2013 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60315
Appears in Collections: 过去全球变化的重建
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作者单位: INSTAAR, University of Colorado, Boulder, CO 80309, United States; Department of Geological Sciences, University of Colorado, Boulder, CO 80309, United States; Department of Geography, University of Sheffield, Sheffield S10 2TN, United Kingdom
Recommended Citation:
Andrews J.T.,Bigg G.R.,Wilton D.J.. Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: Detecting and modelling changing sediment sources[J]. Quaternary Science Reviews,2014-01-01,91