DOI: 10.1016/j.quascirev.2016.03.023
Scopus记录号: 2-s2.0-84962829480
论文题名: A Sr-Nd-Hf isotope characterization of dust source areas in Victoria Land and the McMurdo Sound sector of Antarctica
作者: Blakowski M.A. ; Aciego S.M. ; Delmonte B. ; Baroni C. ; Salvatore M.C. ; Sims K.W.W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 141 起始页码: 26
结束页码: 37
语种: 英语
英文关键词: Antarctica
; Dust
; Nd-Hf isotopes
; Paleoclimate
; Sr-Nd isotopes
Scopus关键词: Geochemistry
; Glaciers
; Hafnium
; Ice
; Isotopes
; Sediments
; Strontium
; Antarctic ice sheets
; Antarctica
; East antarctic ice sheets
; Geochemical characterization
; Geographical provenances
; Hf isotope
; Paleoclimates
; Sr-Nd isotopes
; Dust
; dust
; hafnium
; ice core
; ice sheet
; isotopic analysis
; neodymium isotope
; paleoclimate
; provenance
; Quaternary
; radionuclide
; sediment transport
; strontium isotope
; Antarctic Ice Sheet
; Antarctica
; East Antarctic Ice Sheet
; East Antarctica
; McMurdo Sound
; Victoria Land
英文摘要: Determining the geographical provenance of dust provides crucial insight into the global dust cycle. For the East Antarctic Ice Sheet (EAIS), the importance of Southern hemisphere potential dust sources has been thoroughly investigated using radiogenic isotopes, whereas proximal dust source areas located on the periphery of the ice sheet remain poorly documented from a geochemical standpoint. In this work, we expand the existing isotopic (SrNd) catalogue of dust and sand-sized sediments from Victoria Land and the McMurdo Sound sector, and incorporate Hf isotopic data to place additional constraints on dust source identification. The isotopic field for materials considered in this study is characterized by 87Sr/86Sr ratios ranging from 0.703 to 0.783, εNd between -12.01 and 6.36, and εHf from -16.77 to 6.89. As reported in previous works, the data reveal close relationships between Antarctic sediments and distinct parent lithologies; in addition, our findings emphasize the background presence of very fine dusts originating from dominant global sources and regional volcanic activity as barriers to direct source-to-sink comparison of isotopic signatures. Thus, geochemical characterizations of dust sources to the Antarctic ice sheet involving multiple size fractions, including coarser-grained particles more susceptible to short-range transport, can help us to rule out global sources of dust when examining local sediment cores and ice cores. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59600
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Environmental Sciences, University of Michigan, 1100 N. University Avenue, Ann Arbor, MI, United States; DISAT, University of Milano- Bicocca, Piazza Della Scienza N. 1, Milan, Italy; Dipartimento di Scienze Della Terra, University of Pisa, Pisa and CNR Instituto di Geoscienze e Georisore, Via S. Maria N. 53, Pisa, Italy; Department of Geology and Geophysics, University of Wyoming, 1000 E. University Avenue, Laramie, WY, United States
Recommended Citation:
Blakowski M.A.,Aciego S.M.,Delmonte B.,et al. A Sr-Nd-Hf isotope characterization of dust source areas in Victoria Land and the McMurdo Sound sector of Antarctica[J]. Quaternary Science Reviews,2016-01-01,141