globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.08.009
Scopus记录号: 2-s2.0-85027858239
论文题名:
Provenance of loess in the central Great Plains, U.S.A. based on Nd-Sr isotopic composition, and paleoenvironmental implications
作者: Yang Y.; Mason J.A.; Zhang H.; Lu H.; Ji J.; Chen J.; Liu L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 173
起始页码: 114
结束页码: 123
语种: 英语
英文关键词: Great Plains ; Loess sources ; Nd-Sr isotopic composition
Scopus关键词: Binary alloys ; Dust ; Isotopes ; Neodymium alloys ; Plants (botany) ; Sediments ; Uranium alloys ; Central Great Plains ; Great Plains ; Isotopic composition ; Last Glacial Maximum ; Marine isotope stages ; Sr isotopic analysis ; Sr isotopic compositions ; Vegetation response ; Strontium alloys
英文摘要: Loess of the central Great Plains, U.S.A., records intervals of Quaternary aeolian dust accumulation at rates among the highest known worldwide. This study used Nd-Sr isotopic analysis to investigate the provenance of Middle Pleistocene to Holocene loess in western and central Nebraska, U.S.A., essential information for understanding the paleoenvironmental conditions that allowed such rapid accumulation to occur at some times and not others. Nd-Sr isotopic data suggest that dust from unglaciated Great Plains landscapes has been the primary component of loess accumulated at both very high and low rates since the Middle Pleistocene. However, loess isotopic compositions all require an additional minor source with higher 87Sr/86Sr and lower εNd, most likely debris from Precambrian rocks in the Rocky Mountains, carried to the Great Plains by the Platte River system. The contribution from this secondary source—probably including glacially eroded sediment—was greater in Marine Isotope Stage (MIS) 3 and early MIS 2, but decreased somewhat just after the last glacial maximum (LGM) at the Bignell Hill section. Earlier research showed that the highest accumulation rates in that section also occurred after the LGM; thus our results likely indicate increased dust emission from unglaciated landscapes at that time. Greater plant moisture stress in a warming climate with still-low CO2 could have played a role in that increased dust production, along with lagged vegetation response; however, a strengthened westerly component of surface winds is the most straightforward explanation. © 2017 Elsevier Ltd
资助项目: This study was funded by National Science Foundation of China (41230526, 41690111). The authors acknowledge and appreciate the laboratory assistance provided by Gaojun Li, Wancang Zhao, Chenghong Liang, Wenfang Zhang, Tao Li and Le Li, field assistance by Mr. Hui Ruoyu and Professor Yali Zhou, and the helpful comments of two reviewers for the journal.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59111
Appears in Collections:过去全球变化的重建

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作者单位: Ministry of Education Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; Department of Geography, University of Wisconsin Madison, 160 Science Hall, 550 N. Park St., Madison, WI, United States; School of Geography and Ocean Science, Nanjing University, Nanjing, China

Recommended Citation:
Yang Y.,Mason J.A.,Zhang H.,et al. Provenance of loess in the central Great Plains, U.S.A. based on Nd-Sr isotopic composition, and paleoenvironmental implications[J]. Quaternary Science Reviews,2017-01-01,173
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