DOI: 10.1016/j.quascirev.2018.10.018
Scopus记录号: 2-s2.0-85056732685
论文题名: New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake, Alaska (USA)
作者: Fortin D. ; Praet N. ; McKay N.P. ; Kaufman D.S. ; Jensen B.J.L. ; Haeussler P.J. ; Buchanan C. ; De Batist M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 203 起始页码: 90
结束页码: 101
语种: 英语
英文关键词: Age model
; Alaska
; Geochronology
; Tephra
; Varve
Scopus关键词: Bayesian networks
; Computerized tomography
; Geochronology
; Lakes
; Probability distributions
; Sediments
; Age modeling
; Alaska
; Bayesian probabilistic models
; Environmental change
; Lacustrine sediments
; Tephra
; Varve
; Varve chronologies
; Uncertainty analysis
; age structure
; chronology
; geochemistry
; geochronology
; lacustrine deposit
; paleoenvironment
; radiocarbon dating
; sediment core
; tephra
; uncertainty analysis
; varve
; Alaska
; Chugach Mountains
; Coast Ranges
; Eklutna Lake
; United States
英文摘要: Developing robust chronological frameworks of lacustrine sediment is central to reconstructing past environmental changes. We present varve chronologies from five sites extending back 2300 years from Eklutna Lake, in the Chugach Mountains of south-central Alaska. The chronologies are built from image analysis of high-resolution photographs and CT scans of sediment cores. The age uncertainty of each record is tested by three methods. We first present varve chronologies from individual sites and reconcile the difference in varve delimitation from two observers. The varve chronologies from each site are then compared to each other using a series of marker beds that can be traced across the lake basin. Finally, using a new Bayesian probabilistic model, we develop age models that incorporate information regarding age uncertainty from the multiple-observer method and the age distribution of marker layers from multiple cores. To evaluate the accuracy of the Bayesian model output, we used seven radiocarbon ages from terrestrial macrofossils and four tephra layers traceable across the core sites. The major-element geochemistry of the tephra layers and their ages are presented here for the first time. The Bayesian age model offers a new approach to quantifying age uncertainty in inter-correlated cores of varved sediment. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117441
Appears in Collections: 气候变化与战略
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Recommended Citation:
Fortin D.,Praet N.,McKay N.P.,et al. New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake, Alaska (USA)[J]. Quaternary Science Reviews,2019-01-01,203