气候变化领域集成服务门户(CCPortal): Paleoclimatic significance of rare earth element record of the calcareous lacustrine sediments from a long core (SG-1) in the western Qaidam Basin, NE Tibetan Plateau

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DOI	10.1016/j.gexplo.2014.06.013
	Paleoclimatic significance of rare earth element record of the calcareous lacustrine sediments from a long core (SG-1) in the western Qaidam Basin, NE Tibetan Plateau
	Yang, Yibo; Fang, Xiaomin; Galy, Albert; Li, Minghui; Appel, Erwin; Liu, Xiaoming
通讯作者	Yang, YB (通讯作者)
发表日期	2014
ISSN	0375-6742
EISSN	1879-1689
起始页码	223
结束页码	232
卷号	145
英文摘要	Rare earth elements (REEs) have been widely applied as provenance tracer, but few studies focus on the potential paleoclimatic implications in long-term sedimentary sequences. This study analyzed REEs in the calcareous lacustrine sediments from a 938.5 m long core (SG-1) in the western Qaidam Basin in order to evaluate the usefulness of their abundance and fractionation in understanding the paleoclimatic evolution in the drainage area. We used acetic acid (HOAc) to leach the labile fraction of REEs, and citrate-bicarbonate-dithionite (CBD) to extract REEs associated with Fe-Mn oxides/oxyhydroxides. Four REE phases in the core sediments were identified, including HOAc leachate, HOAc residue, CBD extraction, and the bulk phase. On average, portion of REEs in HOAc residue constitutes about 80% of the bulk phase, while those portions from HOAc leachate and CBD extraction make up 18% and 3%, respectively. The REE's characteristics in the HOAc residue phase, and to a lesser extent in the bulk phase, remain stable along the core, while those in HOAc leachate and CBD extraction vary dramatically. REE abundance and fractionation in HOAc leachate and the CBD extraction phases with other well studied climatic proxies in the core are compared. The REE abundance and the degree of fractionation of HOAc leachate and CBD extraction phases provide sensitive proxies for the intensity of chemical weathering in the source area, which relate to climate change in the drainage area. The REE records in the core SG-1 reveal a long-term weakening of chemical weathering since 2.77 Ma in the western Qaidam Basin. (C) 2014 Elsevier B.V. All rights reserved.
关键词	SEQUENTIAL EXTRACTION EVAPORITE MINERALS REE GEOCHEMISTRY MARINE-SEDIMENTS FE OXYHYDROXIDE CLIMATE-CHANGE STREAM WATERS CARRIZO SAND FRACTIONATION LAKE
英文关键词	Rare earth elements; Lacustrine sediments; Western Qaidam Basin; Climate change
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000339964000021
来源期刊	JOURNAL OF GEOCHEMICAL EXPLORATION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258381
推荐引用方式 GB/T 7714	Yang, Yibo,Fang, Xiaomin,Galy, Albert,et al. Paleoclimatic significance of rare earth element record of the calcareous lacustrine sediments from a long core (SG-1) in the western Qaidam Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2014,145.
APA	Yang, Yibo,Fang, Xiaomin,Galy, Albert,Li, Minghui,Appel, Erwin,&Liu, Xiaoming.(2014).Paleoclimatic significance of rare earth element record of the calcareous lacustrine sediments from a long core (SG-1) in the western Qaidam Basin, NE Tibetan Plateau.JOURNAL OF GEOCHEMICAL EXPLORATION,145.
MLA	Yang, Yibo,et al."Paleoclimatic significance of rare earth element record of the calcareous lacustrine sediments from a long core (SG-1) in the western Qaidam Basin, NE Tibetan Plateau".JOURNAL OF GEOCHEMICAL EXPLORATION 145(2014).