干旱区生态环境知识资源中心(Arid): 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

Arid

DOI	10.1016/j.gloplacha.2019.103087
	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, Lin 1,2,3; Yi, Shuangwen 2; Zhang, Wenfang 4; Feng, Han 2; Lv, Anqi 2; Zhao, Wancang 2; Luo, Yongming 3; Wang, Qing 1; Lu, Huayu 2
通讯作者	Zeng, Lin ; Yi, Shuangwen
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2020
卷号	185
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.
英文关键词	Eolian deposits Loess provenance Nd and Sr isotopes Grain size Desert expansion Aridification
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000510315900005
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类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	南京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314624
作者单位	1.Ludong Univ, Sch Resources & Environm Engn, Yantai 264025, Peoples R China; 2.Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, 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.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Zeng, Lin,Yi, Shuangwen,Zhang, Wenfang,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]. 南京大学,2020,185.
APA	Zeng, Lin.,Yi, Shuangwen.,Zhang, Wenfang.,Feng, Han.,Lv, Anqi.,...&Lu, Huayu.(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.
MLA	Zeng, Lin,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).