DOI: 10.1016/j.quascirev.2016.02.026
Scopus记录号: 2-s2.0-84962537564
论文题名: Isotopic and elemental evidence for Scabland Flood sediments offshore Vancouver Island
作者: Gombiner J.H. ; Hemming S.R. ; Hendy I.L. ; Bryce J.G. ; Blichert-Toft J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 139 起始页码: 129
结束页码: 137
语种: 英语
英文关键词: Coastal sediment transport
; Cordilleran ice sheet
; Isotope geochemistry
; Missoula Floods
; Scabland Floods
; Sediment provenance
Scopus关键词: Discharge (fluid mechanics)
; Exploratory geochemistry
; Floods
; Glaciers
; Global warming
; Isotopes
; Sea level
; Sediment transport
; Sediments
; Coastal sediment transport
; Continental slope
; Cordilleran ice sheet
; Flood sediments
; Isotope geochemistry
; Ocean circulation
; Offshore vancouver islands
; Sediment provenance
; Ice
; coastal zone
; continental slope
; Cordilleran Ice Sheet
; deep sea
; geochemistry
; geological record
; global warming
; isotopic analysis
; Last Glacial
; neodymium
; neodymium isotope
; paleoceanography
; potassium-argon dating
; sediment transport
; British Columbia
; Canada
; Missoula
; Montana
; Pacific Ocean
; United States
; Vancouver Island
; Washington [United States]
英文摘要: Geological records contain evidence for catastrophic ice-sheet processes such as megafloods and massive ice discharges. Such large-scale phenomena, associated with ice sheet collapse, rapid sea-level rise, and disruptions to ocean circulation, have never been directly observed, but are forecast as a consequence of global warming. Here we use potassium-argon (K/Ar) ages and neodymium (Nd) isotopes as provenance tools to show that cyclical megafloods from the Cordilleran Ice Sheet of western North America traveled through the Channeled Scabland of Washington and transported sediments to the continental slope of Vancouver Island during the last glacial, laying down a sequence of rhythmically bedded sediments in deep-sea core MD02-2496. This work addresses longstanding questions about the absolute timing of Scabland Floods, their cyclicity, and the fate of their sediments and freshwater in the marine realm. Our data suggest that, between ~19.3 and ~14.9 ka, Scabland Floods repeatedly generated far-traveled sediment-water plumes in the NE Pacific Ocean, requiring a hydrologically active ice sheet system capable of producing catastrophic megafloods for about 4500 years. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59614
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, University of MichiganMI, United States; Department of Earth Sciences, University of New Hampshire DurhamNH, United States; Laboratoire de Géologie de Lyon, CNRS UMR 5276, Ecole Normale Supérieure de Lyon and Université Claude Bernard Lyon 1, 46 Allée D'Italie, Lyon Cedex 07, France
Recommended Citation:
Gombiner J.H.,Hemming S.R.,Hendy I.L.,et al. Isotopic and elemental evidence for Scabland Flood sediments offshore Vancouver Island[J]. Quaternary Science Reviews,2016-01-01,139