DOI: 10.1016/j.epsl.2018.08.018
Scopus记录号: 2-s2.0-85052452519
论文题名: Controls on subaerial erosion rates in Antarctica
作者: Marrero S.M. ; Hein A.S. ; Naylor M. ; Attal M. ; Shanks R. ; Winter K. ; Woodward J. ; Dunning S. ; Westoby M. ; Sugden D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501 起始页码: 56
结束页码: 66
语种: 英语
英文关键词: Antarctica
; chlorine-36
; cosmogenic nuclides
; erosion rate
; lithology
Scopus关键词: Carbonates
; Carbonation
; Glacial geology
; Isotopes
; Lithology
; Sedimentary rocks
; Weathering
; Abrasive materials
; Antarctica
; Chemical weathering
; Cosmogenic nuclides
; Erosion rates
; Landscape development
; Physical process
; Physical weathering
; Erosion
; chlorine isotope
; cosmogenic radionuclide
; erosion rate
; lithology
; subaerial exposure
; Antarctica
英文摘要: Erosion rates offer insight on landscape development and the relative importance of chemical and physical processes of weathering. Minimal chemical weathering makes Antarctica an ideal location in which to compare the physical weathering of carbonate rocks to other lithologies. Here we report the first cosmogenic nuclide-derived erosion rates for carbonate rocks in Antarctica. Carbonate samples collected in the southernmost Ellsworth Mountains reflect a 36Cl erosion rate of 0.22 ± 0.02 mm/ka. This erosion rate is consistent with other reported Antarctic erosion rates, but is lower than 36Cl erosion rates derived from other arid regions in the world. These results are integrated with a continent-wide reanalysis of 28 cosmogenic nuclide erosion rate studies (>200 measurements), which comprise numerous rock types and multiple cosmogenic nuclides. By combining cosmogenic nuclide-derived erosion rates across studies, the larger trends provide insight into factors (e.g. lithology, glacial history, and availability of abrasive material) affecting subaerial erosion rates in Antarctica. Statistical analysis of the compiled data set shows differences based on lithology, with sandstone having the largest range of erosion rates. The compiled data also reveals higher erosion rates in areas with a large potential sediment supply, like the Dry Valleys. Samples collected from boulders yield lower erosion rates than those collected from bedrock, likely due to a combination of physical processes that affect boulders and bedrock differently, and glacial history, which can affect the apparent cosmogenic-nuclide derived erosion rate. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109665
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of GeoSciences, University of Edinburgh, Drummond StreetEH8 8XP, United Kingdom; Scottish Universities Environmental Research Centre, East Kilbride, United Kingdom; Department of Geography and Environmental Sciences, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, United Kingdom; Department of Geography, School of Geography, Politics, and Sociology, Newcastle University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
Marrero S.M.,Hein A.S.,Naylor M.,et al. Controls on subaerial erosion rates in Antarctica[J]. Earth and Planetary Science Letters,2018-01-01,501