DOI: 10.1016/j.quascirev.2018.05.009
Scopus记录号: 2-s2.0-85047255470
论文题名: Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland
作者: Graly J.A. ; Corbett L.B. ; Bierman P.R. ; Lini A. ; Neumann T.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 191 起始页码: 118
结束页码: 131
语种: 英语
英文关键词: Cosmogenic isotopes
; Glaciation
; Glaciology
; Greenland
; Interglacials
; Quaternary
; Stable isotopes
Scopus关键词: Coatings
; Earth atmosphere
; Glacial geology
; Glaciers
; Isotopes
; Sediments
; Soil testing
; Cosmogenic isotopes
; Glaciation
; Glaciology
; Greenland
; Interglacials
; Quaternary
; Stable isotopes
; Ice
英文摘要: In order to test whether sediment emerging from presently glaciated areas of Greenland was exposed near or at Earth's surface during previous interglacial periods, we measured the rare isotope 10Be contained in grain coatings of sediment collected at five ice marginal sites. Such grain coatings contain meteoric 10Be (10Bemet), which forms in the atmosphere and is deposited onto Earth's surface. Samples include sediment entrained in ice, glaciofluvial sediment collected at the ice margin, and subglacial sediment extracted during hot water drilling in the ablation zone. Due to burial by ice, contemporary subglacial sediment could only have acquired substantial 10Bemet concentrations during periods in the past when the Greenland Ice Sheet was less extensive than present. The highest measured 10Bemet concentrations are comparable to those found in well-developed, long-exposed soils, suggesting subglacial preservation and glacial transport of sediment exposed during preglacial or interglacial periods. Ice-bound sediment has significantly higher 10Bemet concentrations than glaciofluvial sediment, suggesting that glaciofluvial processes are sufficiently erosive to remove tracers of previous interglacial exposures. Northern Greenland sites where ice and sediment are supplied from the ice sheet's central main dome have significantly higher 10Bemet concentrations than sites in southern Greenland, indicating greater preglacial or interglacial landscape preservation in central Greenland than in the south. Because southern Greenland has more frequent and spatially extensive periods of glacial retreat but nevertheless has less evidence of past subaerial exposure, we suggest that 10Bemet measurements in glacial sediment are primarily controlled by erosional efficiency rather than interglacial exposure length. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112159
Appears in Collections: 气候减缓与适应
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作者单位: Indiana University Purdue University Indianapolis, Dept. of Earth Sciences, Indianapolis, IN, United States; University of Vermont, Dept. of Geology, Burlington, VT, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Graly J.A.,Corbett L.B.,Bierman P.R.,et al. Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland[J]. Quaternary Science Reviews,2018-01-01,191