气候变化领域集成服务门户(CCPortal): Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments

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DOI	10.1016/j.palaeo.2016.01.021
	Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments
	Yang, Yibo; Fang, Xiaomin; Koutsodendris, Andreas; Ye, Chengcheng; Yang, Rongsheng; Zhang, Weilin; Liu, Xiaoming; Gao, Shaopeng
通讯作者	Yang, YB (通讯作者)
发表日期	2016
ISSN	0031-0182
EISSN	1872-616X
起始页码	152
结束页码	161
卷号	446
英文摘要	This study focuses on the concentration of major and trace elements in the diluted acetic acid-soluble fraction of SG-1 core lacustrine sediments from the western Qaidam Basin (Tibetan Plateau) in order to explore the potential of applying bulk carbonate analysis to tracing paleolake evolution and climate change. The SG-1 core sediments are considered highly suited to the exploration of the paleoenvironmental significance of bulk carbonate geochemistry, because most carbonates in the core are authigenic in origin. Based on a principal component analysis of the elemental composition of diluted acetic acid leachate, four major components with distinct characteristics have been extracted, accounting for similar to 80% of the total variance. The first and most important component is associated with a high positive loading of Mn, P, Y, Sc and rare earth elements (REE); the second component is characterized by a high positive loading of Ca, Sr, and U; the third component displays a high negative loading of Mg, Li, and B; and the fourth component is associated with a relatively high positive loading of Fe, V and Cr. After considering the geochemical behavior of these element assemblies during acid leaching, we have concluded that these four components contain information indicative of watershed climate conditions, carbonate precipitation, lake water salinity and iron oxide content, respectively. Reconstructions of watershed climate change and paleolake evolution using the component scores are comparable to those reconstructed from other independent proxy records, indicating a long-term trend of lake shrinkage and climatic drying since similar to 2.7 Ma with abrupt drying events at similar to 2.5 Ma, similar to 1.8 Ma, similar to 1.2 Ma and similar to 0.6 Ma. Our results suggest that lake carbonates bear more information about watershed climate and lake evolution than expected, and that occurrences of some elements, in particular trace elements, in the diluted acetic acid leachate are not solely and necessarily linked to carbonate minerals. (C) 2016 Elsevier B.V. All rights reserved.
关键词	NE TIBETAN PLATEAU DRILL CORE SG-1 ENVIRONMENTAL-CHANGE EVAPORITE MINERALS LONG CORE ISOTOPE RECORD QINGHAI STRATIGRAPHY ASSEMBLAGES
英文关键词	Carbonate minerals; Geochemistry; Lake sediments; Paleoenvironment; Qaidam Basin; Tibetan Plateau
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000371553000014
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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/258711
推荐引用方式 GB/T 7714	Yang, Yibo,Fang, Xiaomin,Koutsodendris, Andreas,et al. Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments[J]. 中国科学院青藏高原研究所,2016,446.
APA	Yang, Yibo.,Fang, Xiaomin.,Koutsodendris, Andreas.,Ye, Chengcheng.,Yang, Rongsheng.,...&Gao, Shaopeng.(2016).Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,446.
MLA	Yang, Yibo,et al."Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 446(2016).