Rare earth element fractionations of the northwestern South China Sea sediments, and their implications for East Asian monsoon reconstruction during the last 36 kyr

doi:10.1016/j.quaint.2019.09.007

GIEC OpenIR

	Rare earth element fractionations of the northwestern South China Sea sediments, and their implications for East Asian monsoon reconstruction during the last 36 kyr
	Li, Mingkun 1,2; Ouyang, Tingping 1,2; Zhu, Zhaoyu 2; Tian, Chengjing 3; Peng, Shasha 2; Tang, Zhihua 2,4; Qiu, Yan 3; Zhong, Hexian 3; Peng, Xuechao 3
	2019-08-10
发表期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
卷号	525 页码:16-24
通讯作者	Ouyang, Tingping(oyangtp@m.scnu.edu.cn)
摘要	Rare earth elements (REEs) fractionations in siliciclastic marine sediments are related to the parent rock properties, weathering degree, grain size, and heavy minerals. The relations between marine sediment REE compositions and regional paleoclimate are not fully understood. Here, the REEs for detrital components of a core retrieved from the northwestern South China Sea (SCS) were measured. Results show the REE (LREE/HREE, (La/Yb)(N)) and Light REE ((La/Sm)(N)) fractionation degrees have good responses to the regional paleoclimate over the past 36 kyr. Sea level played a key role in REE fractionations during similar to 36-24 kyr BP, manifesting as lower REE and LREE fractionation degrees correspond to the decreased sea level. The entire trends for LREE/HREE, (La/Yb)(N) and (La/Sm)(N) over the past 20.5 kyr are almost in phase with the regional East Asian summer monsoon (EASM) records. Because REEs are mainly concentrated in heavy minerals, the density difference of heavy minerals is probably the main controlling factor on REE fractionations. Clay minerals and feldspars released during the weathering process have a high content of Light REEs (LREEs). In the warm, wet periods (Holocene Optimum, and Bolling-Allerod), more precipitation promoted weathering and strengthened the estuarine hydrodynamic force, which respectively resulted in high content of clay minerals and feldspars, and high-density heavy minerals (e.g., monazite). The process led to LREE enrichment because the enriched minerals contain higher contents of the LREEs. In contrast, the dry, cold climate conditions during the periods Heinrich 1, Younger Dryas, and Last Glacial Maximum resulted in the reversed REE fractionations, as the weak hydrodynamic force can only carry the low-density heavy minerals (e.g., zircon) that are enriched in HREEs. This model does not seem to apply to 36- 24 kyr BP, probably because of the re-transport of ancient shelf sediments. The study facilitates the understanding of REE application in paleoclimate reconstruction within slope sediments.
关键词	Rare earth elements Northwestern South China Sea East Asian summer monsoon 36 kyr BP
DOI	10.1016/j.quaint.2019.09.007
关键词[WOS]	SURFACE SEDIMENTS ; LATE PLEISTOCENE ; CLIMATIC CHANGES ; HIGH-RESOLUTION ; CONTINENTAL-SHELF ; GLACIAL MAXIMUM ; TRACE-ELEMENTS ; NORTH-ATLANTIC ; YELLOW SEA ; GEOCHEMISTRY
收录类别	SCI
语种	英语
资助项目	National Science Foundation of China[41272384] ; Youth Innovation Promotion Association of CAS[2012262] ; China Geological Survey[DD20160138] ; China Geological Survey[GZH201500207] ; China Geological Survey[1212010611302] ; Chinese-Polish collaborated project ERES
WOS研究方向	Physical Geography ; Geology
项目资助者	National Science Foundation of China ; Youth Innovation Promotion Association of CAS ; China Geological Survey ; Chinese-Polish collaborated project ERES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000487248200002
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/25647
专题	中国科学院广州能源研究所
通讯作者	Ouyang, Tingping
作者单位	1.South China Normal Univ, Sch Geog, Guangzhou 510631, Guangdong, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China 3.Guangzhou Marine Geol Survey, Guangzhou 510075, Guangdong, Peoples R China 4.Chinese Acad Sci, Integrated Technol Ctr, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Li, Mingkun,Ouyang, Tingping,Zhu, Zhaoyu,et al. Rare earth element fractionations of the northwestern South China Sea sediments, and their implications for East Asian monsoon reconstruction during the last 36 kyr[J]. QUATERNARY INTERNATIONAL,2019,525:16-24.
APA	Li, Mingkun.,Ouyang, Tingping.,Zhu, Zhaoyu.,Tian, Chengjing.,Peng, Shasha.,...&Peng, Xuechao.(2019).Rare earth element fractionations of the northwestern South China Sea sediments, and their implications for East Asian monsoon reconstruction during the last 36 kyr.QUATERNARY INTERNATIONAL,525,16-24.
MLA	Li, Mingkun,et al."Rare earth element fractionations of the northwestern South China Sea sediments, and their implications for East Asian monsoon reconstruction during the last 36 kyr".QUATERNARY INTERNATIONAL 525(2019):16-24.