DOI: 10.1016/j.epsl.2018.03.017
Scopus记录号: 2-s2.0-85044161880
论文题名: Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses
作者: Boswell S.M. ; Toucanne S. ; Creyts T.T. ; Hemming S.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 490 起始页码: 143
结束页码: 150
语种: 英语
英文关键词: Baltic Ice Stream
; EMMA
; Fennoscandian Ice Sheet
; grain size
; provenance
; εNd
Scopus关键词: Erosion
; Glacial geology
; Glaciers
; Grain size and shape
; Sediment transport
; EMMA
; Grain size
; Ice sheet
; Ice streams
; provenance
; Ice
; Baltic Ice Lake
; grain size
; ice sheet
; ice stream
; Last Glacial Maximum
; neodymium isotope
; numerical model
; provenance
; sediment transport
; Fennoscandia
英文摘要: We introduce a methodology for determining the transport distance of subglacially comminuted and entrained sediments. We pilot this method on sediments from the terminal margin of the Baltic Ice Stream, the largest ice stream of the Fennoscandian Ice Sheet during the Last Glacial Maximum. A strong correlation (R2 = 0.83) between the εNd and latitudes of circum-Baltic river sediments enables us to use εNd as a calibrated measure of distance. The proportion of subglacially transported sediments in a sample is estimated from grain size ratios in the silt fraction (<63 μm). Coupled εNd and grain size analyses reveal a common erosion source for the Baltic Ice Stream sediments located near the Åland sill, more than 850 km upstream from the terminal moraines. This result is in agreement with both numerical modeling and geomorphological investigations of Fennoscandinavian erosion, and is consistent with rapid ice flow into the Baltic basins prior to the Last Glacial Maximum. The methodology introduced here could be used to infer the distances of glacigenic sediment transport from Late Pleistocene and earlier glaciations. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109951
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Lamont-Doherty Earth Observatory, United States; Department of Earth and Environmental Sciences, Columbia University, United States; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Unité de Recherche Géosciences Marines, France
Recommended Citation:
Boswell S.M.,Toucanne S.,Creyts T.T.,et al. Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses[J]. Earth and Planetary Science Letters,2018-01-01,490