DOI: 10.1016/j.epsl.2020.116460
论文题名: Geochemistry of aeolian material from the McMurdo Dry Valleys, Antarctica: Insights into Southern Hemisphere dust sources
作者: Diaz M.A. ; Welch S.A. ; Sheets J.M. ; Welch K.A. ; Khan A.L. ; Adams B.J. ; McKnight D.M. ; Cary S.C. ; Lyons W.B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547 语种: 英语
中文关键词: aeolian material
; Antarctica
; major oxides
; mineralogy
; rare earth elements
; trace elements
英文关键词: Exploratory geochemistry
; Ice
; Landforms
; Location
; Minerals
; Rare earths
; Trace elements
; Underwater mineralogy
; Coastal locations
; Geochemical characterization
; Glacial period
; High elevation
; Local materials
; Mcmurdo dry valleys
; South Africa
; Southern Hemisphere
; Dust
; dust
; eolian deposit
; geochemistry
; ice core
; mineralogy
; oxide
; rare earth element
; Southern Hemisphere
; trace element
; Antarctica
; Australia
; East Antarctica
; McMurdo Dry Valleys
; New Zealand
; Patagonia
; South Africa
英文摘要: In the Southern Hemisphere, the major sources of dust and other aeolian materials are from Patagonia, South Africa, Australia, and New Zealand. Dust from Patagonia and New Zealand has been identified in ice cores throughout Antarctica, suggesting that during arid and windy periods, such as glacial periods, dust can be entrained and transported onto the continent. However, little information exists on modern Antarctic dust sources, transport, and its role in the Southern Hemisphere dust cycle. We present the first geochemical characterization of aeolian materials collected at five heights (between 5 cm and 100 cm) above the surface in four valleys within the McMurdo Dry Valleys, the largest ice-free area in Antarctica. Our mineralogy data indicate that these materials are primarily derived from local rocks of the McMurdo Volcanics, Ferrar Dolerite, Beacon Sandstone and Granite Harbor Intrusives, with varying contributions of each rock type dependent on the valley location. While major oxide, trace element and rare earth element data show that low elevation and coastal locations (with respect to the Ross Sea) are dominated by local sources, high elevation and inland locations have accumulated both local materials and dust from other distant Southern Hemisphere sources. This far-traveled material may not be accumulating today, but represents a paleo source that is resuspended from the soils. By geochemically “fingerprinting” aeolian materials from the MDV, we can better inform future studies on the transport of materials within Antarctica and between Southern Hemisphere land masses. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164940
Appears in Collections: 气候变化与战略
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作者单位: School of Earth Sciences, The Ohio State University, Columbus, OH, United States; Byrd Polar and Climate Research Center, The Ohio State University, Columbus, OH, United States; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Department of Environmental Sciences, Western Washington University, Bellingham, WA, United States; Department of Biology, Evolutionary Ecology Laboratories, Monte L. Bean Museum, Brigham Young University, Provo, UT, United States; Department of Civil and Environmental Engineering, University of Colorado Boulder, Boulder, CO, United States; Biological Sciences, University of Waikato, Hamilton, New Zealand
Recommended Citation:
Diaz M.A.,Welch S.A.,Sheets J.M.,et al. Geochemistry of aeolian material from the McMurdo Dry Valleys, Antarctica: Insights into Southern Hemisphere dust sources[J]. Earth and Planetary Science Letters,2020-01-01,547