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学科主题: 地球科学::地质学
题名: Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments
作者: Yang, YB (Yang, Yibo)1, 2; Fang, XM (Fang, Xiaomin)1, 2; Koutsodendris, A (Koutsodendris, Andreas)3; Ye, CC (Ye, Chengcheng)1; Yang, RS (Yang, Rongsheng)1; Zhang, WL (Zhang, Weilin)1, 2; Liu, XM (Liu, Xiaoming)1; Gao, SP (Gao, Shaopeng)1
通讯作者: Yang, YB
刊名: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
发表日期: 2016
DOI: 10.1016/j.palaeo.2016.01.021
卷: 446, 期:0, 页:152-161
收录类别: SCI
合作性质: 国际
文章类型: Article
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.
语种: 英语
WOS记录号: WOS:000371553000014
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7732
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Heidelberg Univ, Inst Earth Sci, Paleoenvironm Dynam Grp, Neuenheimer Feld 234, D-69120 Heidelberg, Germany

Recommended Citation:
Yang, YB ,Fang, XM ,Koutsodendris, A ,et al. Exploring Quaternary paleolake evolution and climate change in the western Qaidam Basin based on the bulk carbonate geochemistry of lake sediments[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2016,446(0):152-161.
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文件名: V.446 152-161 2016.pdf
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