Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1130/B26218.1 |
Geochemical evidence for airborne dust additions to soils in Channel Islands National Park, California | |
Muhs, Daniel R.1; Budahn, James R.1; Johnson, Donald L.2; Reheis, Marith1; Beann, Jossh1; Skipp, Gary1; Fisher, Eric1; Jones, Julia A.3 | |
通讯作者 | Muhs, Daniel R. |
来源期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2008 |
卷号 | 120期号:1-2页码:106-126 |
英文摘要 | There is an increasing awareness that dust plays important roles in climate change, bio-geochemical cycles, nutrient supply to ecosystems, and soil formation. In Channel Islands National Park, California, soils are clay-rich Vertisols or Alfisols and Mollisols with vertic properties. The soils are overlain by silt-rich mantles that contrast sharply with the underlying clay-rich horizons. Silt mantles contain minerals that are rare or absent in the volcanic rocks that dominate these islands. Immobile trace elements (Sc-Th-La and Ta-Nd-Cr) and rare-earth elements show that the basalt and andesite on the islands have a composition intermediate between upper-continental crust and oceanic crust. In contrast, the silt fractions and, to a lesser extent, clay fractions of the silt mantle have compositions closer to average upper-continental crust and very similar to Mojave Desert dust. Island shelves, exposed during the last glacial period, could have provided a source of eolian sediment for the silt mantles, but this is not supported by mineralogical data. We hypothesize that a more likely source for the silt-rich mantles is airborne dust from mainland California and Baja California, either from the Mojave Desert or from the continental shelf during glacial low stands of sea. Although average winds are from the northwest in coastal California, easterly winds occur numerous times of the year when "Santa Ana" conditions prevail, caused by a high-pressure cell centered over the Great Basin. The eolian silt mantles constitute an important medium of plant growth and provide evidence that abundant eolian silt and clay may be delivered to the eastern Pacific Ocean from inland desert sources. |
英文关键词 | silt mantles dust eolian soils marine terraces volcanic rocks california Channel Islands National Park Santa Cruz Island Santa Barbara Island Anacapa Island mineralogy geochemistry trace elements rare earths Santa Ana winds |
类型 | Review |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000252096800007 |
WOS关键词 | LAST GLACIAL MAXIMUM ; CIMA-VOLCANIC-FIELD ; PACIFIC PELAGIC SEDIMENTS ; LANZAROTE CANARY-ISLANDS ; EARLY HUMAN OCCUPATION ; SOUTHERN NEVADA ; MOJAVE-DESERT ; EOLIAN DUST ; CHEMICAL CLASSIFICATION ; CHRONOMETRICAL EVIDENCE |
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/2XILL650/157413 |
作者单位 | 1.US Geol Survey, Fed Ctr, Lakewood, CO 80225 USA; 2.Univ Illinois, Dept Geog, Urbana, IL 61801 USA; 3.Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Muhs, Daniel R.,Budahn, James R.,Johnson, Donald L.,et al. Geochemical evidence for airborne dust additions to soils in Channel Islands National Park, California[J]. United States Geological Survey,2008,120(1-2):106-126. |
APA | Muhs, Daniel R..,Budahn, James R..,Johnson, Donald L..,Reheis, Marith.,Beann, Jossh.,...&Jones, Julia A..(2008).Geochemical evidence for airborne dust additions to soils in Channel Islands National Park, California.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,120(1-2),106-126. |
MLA | Muhs, Daniel R.,et al."Geochemical evidence for airborne dust additions to soils in Channel Islands National Park, California".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 120.1-2(2008):106-126. |
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