气候变化领域集成服务门户(CCPortal): Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska

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DOI	10.1130/B31792.1
	Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska
	Boes E.; Van Daele M.; Moernaut J.; Schmidt S.; Jensen B.J.L.; Praet N.; Kaufman D.; Haeussler P.; Loso M.G.; De Batist M.
发表日期	2018
ISSN	167606
起始页码	757
结束页码	774
卷号	130 期号:2021-05-06
英文摘要	The sediments stored in the large, deep proglacial lakes of south-central Alaska are largely unstudied. We analyzed sediments in 20 cores, up to 160 cm long, from Eklutna, Kenai, and Skilak Lakes, using a combination of repeated lamination counting, radionuclide dating, event stratigraphy, and tephrochronology. We show that the characteristically rhythmic layers were deposited annually. Most of these glacial varves consist of one coarse-grained base and a fine-grained top, but varves composed of multiple coarsegrained turbidite pulses are common too. They are likely related to successive episodes of high sediment discharge during flooding, and they become more frequent in all three lakes, along with increased sedimentation rates, during the nineteenth century late phase of the Little Ice Age. These flood turbidites were generated by rain events and intense melting of snow and ice. Other (mega) turbidites are a result of earthquake-triggered slope collapses (e.g., A.D. 1964). Some event layers are present in all three lakes. In addition, the annual time series of varve thickness (normalized annual sedimentation rate) are significantly correlated among the three lakes (ρ > 0.27; p < 0.001). Differences between the varve thickness records can be attributed partly to the dam construction at Eklutna Lake and outbursts from an icedammed lake at Skilak Lake. Geomorphologic differences among the catchments result in further differences in sedimentation patterns in the three lakes. © 2017 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185039
作者单位	Renard Centre of Marine Geology, Department of Geology, Ghent University, Krijgslaan 281, Ghent, 9000, Belgium; Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria; Instituto de Ciencias de la Terra, Universidad Austral de Chile, Casilla 567, Valdivia, 14101, Chile; Centre National de la Recherche Scientifique (CNRS), Observatoire Aquitain des Sciences de l'Univers (OASU), University of Bordeaux, Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Pessac, 33615, France; Royal Alberta Museum, 12845 102 Avenue, Edmonton, AB T5N 0M6, Canada; School of Earth Sciences and Environmental Sustainability, Northern Arizona University, South Knoles Drive 625, Flagstaff, AZ 86011, United States; U.S. Geological Survey, University Drive 4210, Anchorage, AK 99508, United States; Wrangell-St. Elias National Park and Preserve, P.O. Box 439, Copper Center, AK 99573, United States; Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Scienc...
推荐引用方式 GB/T 7714	Boes E.,Van Daele M.,Moernaut J.,et al. Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska[J],2018,130(2021-05-06).
APA	Boes E..,Van Daele M..,Moernaut J..,Schmidt S..,Jensen B.J.L..,...&De Batist M..(2018).Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska.Bulletin of the Geological Society of America,130(2021-05-06).
MLA	Boes E.,et al."Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska".Bulletin of the Geological Society of America 130.2021-05-06(2018).