Provenance of loess deposits and stepwise expansion of the desert environment in NE China since similar to 1.2 Ma: Evidence from Nd-Sr isotopic composition and grain-size record

doi:10.1016/j.gloplacha.2019.103087

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室 > 近岸生态与环境实验室

	Provenance of loess deposits and stepwise expansion of the desert environment in NE China since similar to 1.2 Ma: Evidence from Nd-Sr isotopic composition and grain-size record
	Zeng, L ; Yi, SW ; Zhang, WF ; Feng, H ; Lv, AQ ; Zhao, WC ; Luo, YM ; Wang, Q ; Lu, HY
刊名	GLOBAL AND PLANETARY CHANGE
	2020-01
卷号	185 页码:103087
关键词	Eolian deposits Loess provenance Nd and Sr isotopes Grain size Desert expansion Aridification
ISSN号	0921-8181
DOI	10.1016/j.gloplacha.2019.103087
产权排序	[Zeng, Lin ; Wang, Qing] Ludong Univ, Sch Resources & Environm Engn, Yantai 264025, Peoples R China ; [Zeng, Lin ; Yi, Shuangwen ; Feng, Han ; Lv, Anqi ; Zhao, Wancang ; Lu, Huayu] Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, Peoples R China ; [Zeng, Lin ; Luo, Yongming] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China ; [Zhang, Wenfang] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China
文献子类	Article
英文摘要	The Quaternary wind-blown Chinese loess-paleosol sequence, which developed as a product of the intensification of Northern Hemisphere glacial-interglacial cycles, is a major source of information on aridification of the Asian interior. In northeastern (NE) China, extensive loess deposits occur that have great potential for reconstructing the long-term paleoclimatic evolution of the region. Despite existing geochemical data indicate that the probable major source areas for these loess deposits were the nearby Horqin and Otindag deserts, it is still unclear that whether there was a long-term change in the detrital source of these loess deposits. In addition, the aridity history and long-term desert evolution of NE China are currently poorly understood. In the present study, we measured the silicate Nd and Sr isotopic composition of the 28-45 mu m grain-size fraction from multiple loess sections (NYZG, SBH, and TDJZ). The results show that the loess deposits of the three sites were dominantly sourced from the Otindag sandy desert and that this source remained constant for the past 1.2 Ma. Notably, the Sr-87/Sr-86 ratios are influenced mainly by variations in the content of clay-sized material present in the form of aggregates or adhering to the surface of coarser particles. Therefore, caution is needed in the use of (87)sr/(86)sr ratios of the 28-45 mu m fraction as a tracer of eolian dust, when the clay minerals are not completely removed during the pretreatment process. The grain-size variability of the three sections indicates that stepwise enhancement of aridification in the Otindag sandy desert occurred at 1.2 Ma, 0.9 Ma, and 0.7 Ma, which coincided respectively with the beginning of the Mid-Pleistocene transition (MPT), an extremely cold event at similar to 0.9 Ma within the MPT, and the establishment of a full glacial climate at the termination of the MPT. This finding supports the hypothesis that the growth of high-latitude ice sheets was the major driver of the long-term aridification of Asian dust source areas.
WOS关键词	TROPICAL ATLANTIC-OCEAN ; TIBETAN PLATEAU ; DUST SOURCES ; NORTHERN-HEMISPHERE ; ICE-VOLUME ; ASTRONOMICAL TIMESCALE ; ASIAN MONSOONS ; PHASED UPLIFT ; YELLOW-RIVER ; EAST-ASIA
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
语种	英语
WOS记录号	WOS:000510315900005
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China [41807418, 41877451, 41690111] ; Global Change Program of Ministry of Science and Technology of China [2016YFA0600503] ; National Science Foundation of China-Shandong United fund [U1706220] ; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS [2019SDHADKFJJ13]
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/24780]
专题	烟台海岸带研究所_近岸生态与环境实验室烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室
作者单位	1.Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, Peoples R China; 2.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China 3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China; 4.Ludong Univ, Sch Resources & Environm Engn, Yantai 264025, Peoples R China;
推荐引用方式 GB/T 7714	Zeng, L,Yi, SW,Zhang, WF,et al. Provenance of loess deposits and stepwise expansion of the desert environment in NE China since similar to 1.2 Ma: Evidence from Nd-Sr isotopic composition and grain-size record[J]. GLOBAL AND PLANETARY CHANGE,2020,185:103087.
APA	Zeng, L.,Yi, SW.,Zhang, WF.,Feng, H.,Lv, AQ.,...&Lu, HY.(2020).Provenance of loess deposits and stepwise expansion of the desert environment in NE China since similar to 1.2 Ma: Evidence from Nd-Sr isotopic composition and grain-size record.GLOBAL AND PLANETARY CHANGE,185,103087.
MLA	Zeng, L,et al."Provenance of loess deposits and stepwise expansion of the desert environment in NE China since similar to 1.2 Ma: Evidence from Nd-Sr isotopic composition and grain-size record".GLOBAL AND PLANETARY CHANGE 185(2020):103087.