气候变化领域集成服务门户(CCPortal): The role of eolian-fluvial interactions and dune dams in landscape change, late Pleistocene

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DOI	10.1130/B35434.1
	The role of eolian-fluvial interactions and dune dams in landscape change, late Pleistocene–Holocene, Mojave Desert, USA
	Sweeney M.R.; McDonald E.V.; Chabela L.P.; Hanson P.R.
发表日期	2020
ISSN	167606
起始页码	2318
结束页码	2332
卷号	132 期号:2021-11-12
英文摘要	The formation of the Kelso Dunes in the eastern Mojave Desert, California, was a landscape-changing event triggered by an increase in sediment supply that followed the incision of Afton Canyon by the Mojave River ca. 25 ka. Eastward migration of sand dunes occurred along a well-defined eolian transport corridor. Dunes temporarily blocked washes resulting in substantial aggradation of eolian and fluvial sediments. Stratigraphic exposures reveal numerous fining-up sequences with interbedded eolian sands that provide evidence of dune dams and subsequent aggradation. Luminescence ages reveal that dune blocking and aggradation correspond to a regional pulse of alluvial fan sedimentation that occurred ca. 14–9 ka. Meanwhile, relative landscape stability occurred downstream of dune dams, resulting in the formation of a moderately developed soil on abandoned fluvial deposits. The next pulse of alluvial fan activity ca. 6–3 ka likely resulted in the breaching of the dune dams, followed by incision. Eolian system sediment state theory suggests that eolian activity in the Mojave Desert is closely tied to enhanced sediment supply, primarily related to the Mojave River–Lake Mojave system. Our data suggests that Intermittent Lake Mojave I, ca. 26–22 ka, triggered a large dune-building event that impounded massive amounts of sediment derived from alluvial fans deposited during the Pleistocene-Holocene transition. Breaching of dune dams and sediment recycling may have also increased sediment supply that contributed to late Holocene eolian activity. This profound impact on the regional geomorphology highlights the critical importance of eolian-fluvial interactions in desert environments. © 2020 Geological Society of America. All Rights Reserved.
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/184845
作者单位	Department of Sustainability & Environment, University of South Dakota, Vermillion, SD 57069, United States; Division of Earth & Ecosystem Sciences, Desert Research Institute, Reno, NV 89512, United States; Terracon Consultants, Inc., Franklin, WI 53132, United States; School of Natural Resources, University of Nebraska–Lincoln, Lincoln, NE 68583, United States
推荐引用方式 GB/T 7714	Sweeney M.R.,McDonald E.V.,Chabela L.P.,等. The role of eolian-fluvial interactions and dune dams in landscape change, late Pleistocene–Holocene, Mojave Desert, USA[J],2020,132(2021-11-12).
APA	Sweeney M.R.,McDonald E.V.,Chabela L.P.,&Hanson P.R..(2020).The role of eolian-fluvial interactions and dune dams in landscape change, late Pleistocene–Holocene, Mojave Desert, USA.Bulletin of the Geological Society of America,132(2021-11-12).
MLA	Sweeney M.R.,et al."The role of eolian-fluvial interactions and dune dams in landscape change, late Pleistocene–Holocene, Mojave Desert, USA".Bulletin of the Geological Society of America 132.2021-11-12(2020).