干旱区生态环境知识资源中心(Arid): New geochemical evidence for the origin of North America's largest dune field, the Nebraska Sand Hills, central Great Plains, USA

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DOI	10.1016/j.geomorph.2019.02.023
	New geochemical evidence for the origin of North America's largest dune field, the Nebraska Sand Hills, central Great Plains, USA
	Muhs, Daniel R.; Budahn, James R.
通讯作者	Muhs, Daniel R.
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2019
卷号	332 页码:188-212
英文摘要	The Nebraska Sand Hills region is the largest dune field in North America and has diverse aeolian landforms. It has been active during both the late Pleistocene and late Holocene. Despite decades of study, the source of sediment for this large sand sea is still controversial. Here we report new trace element compositions of aeolian sand that are compared to four hypothesized sediment sources, Tertiary rocks of the Arikaree Group and Ogallala Group, unconsolidated sands of Pliocene age, and Platte River system sands. All four potential sources have a mineralogy that is similar to the Nebraska Sand Hills. K/Rb, K/Ba, Sc-Th-La, Eu/Eu*, La-N/Yb-N, As/Sb, and Fe/Sc values show, however, that Pliocene sediments and sands from the Platte River system are not likely sources. The Arikaree Group could be a minor contributor, but sands from the Ogallala Group appear to have the best compositional fit to the Nebraska Sand Hills. Although past studies have proposed the Ogallala Group as an important sand source, the hypothesis has been questioned, because the unit is well cemented by calcrete in its upper part. However, examination of the landscape upwind of the Nebraska Sand Hills shows that the Ogallala Group, where it occurs at the land surface, is highly dissected in much of this region, which makes sand-sized particles available for aeolian entrainment whenever drought conditions diminish a protective vegetation cover. Published by Elsevier B.V.
英文关键词	Nebraska Sand Hills Dune field Trace element geochemistry Provenance Pliocene sands Platte River system Arikaree Group Ogallala Group Dissection
类型	Article
语种	英语
国家	USA
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000465062900016
WOS关键词	LATE QUATERNARY LOESS ; AEOLIAN SYSTEM ; PROVENANCE ; DROUGHT ; DESERT ; ACCUMULATION ; REACTIVATION ; VARIABILITY ; EVOLUTION ; TRANSPORT
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216008
作者单位	US Geol Survey, Fed Ctr, MS 980,Box 25046, Denver, CO 80225 USA
推荐引用方式 GB/T 7714	Muhs, Daniel R.,Budahn, James R.. New geochemical evidence for the origin of North America's largest dune field, the Nebraska Sand Hills, central Great Plains, USA[J]. United States Geological Survey,2019,332:188-212.
APA	Muhs, Daniel R.,&Budahn, James R..(2019).New geochemical evidence for the origin of North America's largest dune field, the Nebraska Sand Hills, central Great Plains, USA.GEOMORPHOLOGY,332,188-212.
MLA	Muhs, Daniel R.,et al."New geochemical evidence for the origin of North America's largest dune field, the Nebraska Sand Hills, central Great Plains, USA".GEOMORPHOLOGY 332(2019):188-212.