Arid
DOI10.1029/2008JF001009
Compositions of modern dust and surface sediments in the Desert Southwest, United States
Reheis, Marith C.; Budahn, James R.; Lamothe, Paul J.; Reynolds, Richard L.
通讯作者Reheis, Marith C.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN2169-9003
EISSN2169-9011
出版年2009
卷号114
英文摘要

Modern dusts across southwestern United States deserts are compositionally similar to dust-rich Av soil horizons (depths of 0-0.5 cm and 1-4 cm at 35 sites) for common crustal elements but distinctly different for some trace elements. Chemical compositions and magnetic properties of the soil samples are similar among sites relative to dust sources, geographic areas, and lithologic substrates. Exceptions are Li, U, and W, enriched in Owens Valley, California, and Mg and Sr, enriched in soils formed on calcareous fan gravel in southeast Nevada. The Av horizons are dominated by dust and reflect limited mixing with substrate sediments. Modern dust samples are also similar across the region, except that Owens Valley dusts are higher in Mg, Ba, and Li and dusts both there and at sites to the north on volcanic substrates are higher in Sb and W. Thus, dust and Av horizons consist of contributions from many different sources that are well mixed before deposition. Modern dusts contain significantly greater amounts of As, Cd, Cr, Cu, Ni, Pb, and Sb than do Av horizons, which record dust additions over hundreds to thousands of years. These results suggest that modern dust compositions are influenced by anthropogenic sources and emissions from Owens (dry) Lake after its artificial desiccation in 1926. Both modern dusts and Av horizons are enriched in As, Ba, Cu, Li, Sb, Th, U, and W relative to average crustal composition, which we interpret to indicate that the geologic sources of dust in the southwestern United States are geochemically distinctive.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000263952400002
WOS关键词CENTRAL MOJAVE DESERT ; OWENS LAKE ; TRACE-METALS ; SOUTHERN NEVADA ; EOLIAN DUST ; GEOCHEMICAL VARIATIONS ; NORTH-AMERICA ; CALIFORNIA ; SOILS ; USA
WOS类目Geosciences, Multidisciplinary
WOS研究方向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/2XILL650/161582
作者单位US Geol Survey, Lakewood, CO 80225 USA
推荐引用方式
GB/T 7714
Reheis, Marith C.,Budahn, James R.,Lamothe, Paul J.,et al. Compositions of modern dust and surface sediments in the Desert Southwest, United States[J]. United States Geological Survey,2009,114.
APA Reheis, Marith C.,Budahn, James R.,Lamothe, Paul J.,&Reynolds, Richard L..(2009).Compositions of modern dust and surface sediments in the Desert Southwest, United States.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,114.
MLA Reheis, Marith C.,et al."Compositions of modern dust and surface sediments in the Desert Southwest, United States".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 114(2009).
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