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DOI	10.1016/j.quascirev.2019.105875
	Chronology and sedimentology of a new 2.9 ka annually laminated record from South Sawtooth Lake; Ellesmere Island
	Lapointe F.; Francus P.; Stoner J.S.; Abbott M.B.; Balascio N.L.; Cook T.L.; Bradley R.S.; Forman S.L.; Besonen M.; St-Onge G.
发表日期	2019
ISSN	0277-3791
卷号	222
英文摘要	Few annually laminated (varved) lacustrine records exist in the Arctic, but these high-resolution climate archives are needed to better understand abrupt climate change and the natural mode of climate variability of this sensitive region. This paper presents a new high-resolution 2900-year long varved lake sediment record from the Fosheim Peninsula, Ellesmere Island. The varve chronology is based on multiple varve counts made on high-resolution scanning electron microscope images of overlapping sediment thin sections, and is supported by several independent dating techniques, including 137Cs and 210Pb analysis, one optically stimulated luminescence age located close to the bottom of the composite sequence, and comparison between paleomagnetic variations of this record and the longest High-Arctic varve record, Lower Murray Lake, which confirms the reliability of the Sawtooth chronology. High-resolution backscattered images examined under a scanning electron microscope (SEM) were crucial to giving a more detailed view of sedimentation processes in the lake and thus help to delineate varves more precisely than in conventional image analysis. Fine-scale geochemical analysis reveals that lake sedimentation is mainly clastic and that elemental geochemistry is influenced by grain-size. Principal component analysis of multiple proxies and the coarse grain-size fraction of South Sawtooth Lake display similar fluctuations to the nearby Agassiz Ice Cap ∂18O record, including lower values during the Little Ice Age cold period. These results show this new high-resolution and continuous record has a reliable varve chronology and is sensitive to temperature variability. South Sawtooth Lake's mean sedimentation rate of 1.67 mm a−1 is higher than any other sedimentary sequence in the High Arctic providing a unique opportunity for extracting new, high-resolution paleoclimatological and paleoenvironmental record in a region where few other records currently exist. © 2019 Elsevier Ltd
英文关键词	Arctic climate; Chronology; Holocene; Paleoclimatology; Paleomagnetism; Varves
语种	英语
scopus关键词	Analytical geochemistry; Climate change; Geomagnetism; Grain size and shape; Image analysis; Luminescence; Principal component analysis; Reliability analysis; Scanning electron microscopy; Sedimentation; Sedimentology; Arctic climate; Chronology; Holocenes; Paleoclimatology; Paleomagnetism; Varves; Lakes; arctic environment; chronology; climate variation; historical record; Holocene; lacustrine deposit; Little Ice Age; paleoclimate; paleomagnetism; resolution; sedimentology; varve; Canada; Ellesmere Island; Fosheim Peninsula; Murray Lake; Nunavut; Queen Elizabeth Islands; Sawtooth Lake
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151747
作者单位	Climate Science Center, Department of Geosciences, University of Massachusetts, Amherst, MA 01003, United States; Centre - Eau Terre Environnement, Institut National de la Recherche Scientifique, Canada Research Chair in Environmental Sedimentology, Québec, G1K 9A9, Canada; GEOTOP, Université du Québec à Montréal, Montreal, Québec H3C 3P8, Canada; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Department of Geology and Planetary Science, University of Pittsburgh, Pittsburgh, PA 15260, United States; Department of Geology, College William and Mary, 251 Jamestown Road, Williamsburg, VA 23187, United States; Department of Geology, Baylor University, College of Arts and Sciences, One Bear Place #97354, Waco, TX 76798, United States; Harte Research Institute for Gulf of Mexico Studies, Texas A&M University - Corpus Christi, Corpus Christi, TX 78412, United States; Institut des Sciences de la mer de Rimouski, Canada Research Chair in Marine...
推荐引用方式 GB/T 7714	Lapointe F.,Francus P.,Stoner J.S.,et al. Chronology and sedimentology of a new 2.9 ka annually laminated record from South Sawtooth Lake; Ellesmere Island[J],2019,222.
APA	Lapointe F..,Francus P..,Stoner J.S..,Abbott M.B..,Balascio N.L..,...&St-Onge G..(2019).Chronology and sedimentology of a new 2.9 ka annually laminated record from South Sawtooth Lake; Ellesmere Island.Quaternary Science Reviews,222.
MLA	Lapointe F.,et al."Chronology and sedimentology of a new 2.9 ka annually laminated record from South Sawtooth Lake; Ellesmere Island".Quaternary Science Reviews 222(2019).