DOI: 10.1016/j.quascirev.2015.08.018
Scopus记录号: 2-s2.0-84942013147
论文题名: A 37,000-year environmental magnetic record of aeolian dust deposition from Burial Lake, Arctic Alaska
作者: Dorfman J.M. ; Stoner J.S. ; Finkenbinder M.S. ; Abbott M.B. ; Xuan C. ; St-Onge G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 128 起始页码: 81
结束页码: 97
语种: 英语
英文关键词: Alaska
; Burial lake
; Coercivity
; Deglaciation
; Dust
; Environmental magnetism
; Hematite
; Magnetite
; Paleoclimate
; S-ratios
Scopus关键词: Carbon
; Coercive force
; Computerized tomography
; Demagnetization
; Deposition
; Glacial geology
; Hematite
; Lakes
; Magnetic materials
; Magnetic susceptibility
; Magnetism
; Magnetite
; Magnetization
; Organic carbon
; Seed
; Alaska
; Deglaciations
; Environmental magnetism
; Paleoclimates
; S ratio
; Dust
; basin analysis
; deglaciation
; depositional environment
; eolian deposit
; hematite
; loess
; magnetite
; paleoclimate
; paleomagnetism
; Quaternary
; remanent magnetization
; Alaska
; Burial Lake
; United States
英文摘要: Environmental magnetism and radiocarbon dating of Burial Lake sediments constrain the timing and magnitude of regional aeolian deposition for the Noatak region of western Arctic Alaska for the last ~37,000 years. Burial Lake (68.43°N, 159.17°W, 21.5 m water depth) is optimally located to monitor regional dust deposition because it is perched above local drainage and isolated from glacial processes. Cores collected in the summer of 2010 were studied through the application of magnetizations and progressive alternating field (AF) demagnetization of u-channel samples, with additional data provided by computed tomography (CT) derived density, hysteresis measurements, isothermal remanent magnetization (IRM) acquisition experiments, organic carbon content, biogenic silica, physical grain size, radiocarbon dating of wood, seeds, and plant macrofossils, point source magnetic susceptibility, and X-ray fluorescence (XRF). With similar magnetic properties to regional Alaskan loess deposits, low coercivity, highly magnetic material deposited during the late-Pleistocene contrasts with a high coercivity, weakly magnetic component found throughout the record, consistent with locally-derived detritus. The relative proportion of low coercivity to high coercivity magnetic material, defined by the S-Ratios, is used to reconstruct the regional input of dust to the basin over time. A four-fold decrease in the low coercivity component through the deglacial transition is interpreted to reflect diminished dust input to the region. Comparisons with potential sources of dust show that the timing of deposition in Burial Lake is largely consistent with general aridity, lack of vegetative cover, and increased windiness, rather than glacial advances or retreats. The influence from subaerial exposure of continental shelves cannot be ruled out as a significant far-field source of dust to interior Alaska during the Last Glacial Maximum (LGM), but is unlikely to have been the sole source, or to have contributed to increased dust in both the early and late Holocene. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59792
Appears in Collections: 过去全球变化的重建
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作者单位: Oregon State University, College of Earth, Ocean, and Atmospheric Sciences (CEOAS), Corvallis, OR, United States; University of Pittsburgh, Department of Geology and Planetary Science, Pittsburgh, PA, United States; Canada Research Chair in Marine Geology, Institut des sciences de la mer de Rimouski (ISMER), GEOTOP, Rimouski, QC, Canada
Recommended Citation:
Dorfman J.M.,Stoner J.S.,Finkenbinder M.S.,et al. A 37,000-year environmental magnetic record of aeolian dust deposition from Burial Lake, Arctic Alaska[J]. Quaternary Science Reviews,2015-01-01,128