DOI: 10.1016/j.quascirev.2014.01.008
Scopus记录号: 2-s2.0-84900407806
论文题名: Imprint of late Pleistocene continental processes visible in ice-rafted grains from the central Arctic Ocean
作者: Immonen N. ; Strand K. ; Huusko A. ; Lunkka J.P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 133
结束页码: 139
语种: 英语
英文关键词: Arctic Ocean
; Ice-rafted grains
; Lomonosov Ridge
; Marine isotope stage
; Source area processes
; Surface microtextures
Scopus关键词: Cluster analysis
; Isotopes
; Oceanography
; Principal component analysis
; Scanning electron microscopy
; Sea ice
; Sediments
; Arctic ocean
; Lomonosov ridges
; Marine isotope stages
; Micro texture
; Source area
; Glacial geology
; cluster analysis
; deglaciation
; environmental conditions
; glacial deposit
; ice sheet
; iceberg calving
; marine isotope stage
; Pleistocene
; principal component analysis
; sand
; scanning electron microscopy
; Arctic Ocean
; Lomonosov Ridge
英文摘要: Ice-rafted quartz sand grains of sediment samples representing marine isotope stages (MIS) 3 and 4 from the Lomonosov Ridge, Arctic Ocean, are here analysed with a scanning electron microscope (SEM) to characterise processes in the sediment source area. The microtextural characteristics of the grains were observed and their microtexture frequencies calculated. Specific sets of microtextures were identified and classified (Group I-III) using principal component analysis (PCA) and cluster analysis. The statistically analysed microtextural data were used to identify signals of continental processes that operated during the late Pleistocene (MIS 4 to MIS 3) in the Eurasian Arctic. The microtextures of Group I generally formed as a result of prolonged fluvial/alluvial or aeolian transport. The glacial microtextures of Groups II and III indicate subglacial conditions and transport. Based on the data, two principal components seem to characterise late Pleistocene continental environmental conditions - glacial and non-glacial. There is a signal of non-glacial continental processes in the ice-rafted grains at around 62, 64 and 67ka ago. A signal of subglacial processes was observed in the grains at around 26, 34, 42 and 45ka and, concurrent with non-glacial, at around 62 and 64ka ago. We suggest that these signals in MIS 4 sediments are related to deglaciation with an increased supply of glacial sediment to the Arctic Ocean, whereas during MIS 3 they were probably related more to iceberg calving from the oscillating Barents-Kara ice sheet. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60294
Appears in Collections: 过去全球变化的重建
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作者单位: Thule Institute, University of Oulu, P.O. Box 7300, FI-90014 Oulu, Finland; Department of Geosciences, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
Recommended Citation:
Immonen N.,Strand K.,Huusko A.,et al. Imprint of late Pleistocene continental processes visible in ice-rafted grains from the central Arctic Ocean[J]. Quaternary Science Reviews,2014-01-01,92