DOI: 10.1016/j.quascirev.2018.01.009
Scopus记录号: 2-s2.0-85041478863
论文题名: Timing of lake-level changes for a deep last-glacial Lake Missoula: optical dating of the Garden Gulch area, Montana, USA
作者: Smith L.N. ; Sohbati R. ; Buylaert J.-P. ; Lian O.B. ; Murray A. ; Jain M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 183 起始页码: 23
结束页码: 35
语种: 英语
英文关键词: Glacial lake Missoula
; North America
; Optical dating methods
; Periglacial
; Quaternary
Scopus关键词: Glacial geology
; Luminescence
; Quartz
; Sand
; Stratigraphy
; Timing circuits
; Glacial Lake Missoula
; North America
; Optical dating
; Periglacial
; Quaternary
; Lakes
; age determination
; bioturbation
; bleaching
; feldspar
; glaciolacustrine deposit
; highstand
; ice-dammed lake
; lake level
; lamination
; Last Glacial
; luminescence dating
; periglacial environment
; quartz
; Quaternary
; subaerial exposure
; tephra
; transgression
; Australia
; Cascade Range
; Clark Fork River
; Drummond Basin
; Glacier Peak
; Montana
; North America
; Queensland
; United States
; Washington [United States]
英文摘要: Glaciolacustrine sediments in the Clark Fork River valley at Garden Gulch, near Drummond, Montana, USA record highstand positions of the ice-dammed glacial Lake Missoula and repeated subaerial exposure. During these highstands the lake was at greater than 65% of its recognized maximum capacity. The initial lake transgression deposited a basal sand unit. Subsequent cycles of lake-level fluctuations are recorded by sequences of laminated and cross laminated silt, sand, and clay deformed by periglacial processes during intervening periods of lower lake levels. Optically stimulated luminescence (OSL) dating of quartz sand grains, using single-aliquot regenerative-dose procedures, was carried out on 17 samples. Comparison of infrared stimulated luminescence (IRSL) from K-rich feldspar to OSL from quartz for all the samples suggests that they were well bleached prior to deposition and burial. Ages for the basal sand and overlying glaciolacustrine exposure surfaces are indistinguishable within one standard deviation, and give a weighted mean age of 20.9 ± 1.3 ka (n = 11). Based on sedimentological and stratigraphic analysis we infer that the initial transgression, and at least six cycles of lake-level fluctuation, occurred over time scales of decades to ∼2 ka. Bioturbated sandy slopewash dated at 10.6 ± 0.9 ka and 11.9 ± 1.2 ka unconformably overlies the upper glaciolacustrine deposits. The uppermost sediments, above the glaciolacustrine section, are younger than the Glacier Peak tephra (13.7–13.4 cal ka B.P.), which was deposited across parts of the drained lake basin, but has not been found at Garden Gulch. Our study indicates that glacial Lake Missoula reached >65 percent of maximum capacity by about 20.9 ± 1.3 ka and either partially or completely drained twelve times from this position. Rapid lowering from the lake's highstand position due to ice-dam failure likely led to scour in the downstream portions of the glacial Lake Missoula basin and megafloods in the Channeled Scabland. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112291
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Engineering, Montana Tech of the University of Montana, 1300 W. Park St., Butte, MT 59701, United States; Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, 4000, Denmark; Nordic Laboratory for Luminescence Dating, Aarhus University, DTU Risø Campus, Roskilde, 4000, Denmark; Department of Geography and the Environment, University of the Fraser Valley, Abbotsford, British Columbia V2S 7M8, Canada
Recommended Citation:
Smith L.N.,Sohbati R.,Buylaert J.-P.,et al. Timing of lake-level changes for a deep last-glacial Lake Missoula: optical dating of the Garden Gulch area, Montana, USA[J]. Quaternary Science Reviews,2018-01-01,183