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Spatial uniformity in the mineralogical and geochemical compositions of surface sediments in Lake Qinghai and their controlling factors
Chen, Liu-Mei1; Jin, Zhangdong1,2; Wan, Dejun3; Zhang, Fei1
2015-04-01
发表期刊LIMNOLOGY
ISSN1439-8621
卷号16期号:2页码:113-125
文章类型Article
摘要

To advance the understanding of the spatial variability of sediment composition and its controlling factors in a large hydrologically closed lake, the spatial distributions in the mineralogy and geochemistry of 18 surface sediment samples along three transects across the deepest part of Lake Qinghai on the northeastern Tibetan Plateau were investigated. The data show (1) that the surface lake sediments are almost the same in the XRD patterns, (2) that the sediments do not have considerable changes in geochemical compositions along three transects and (3) that the standard deviations of the lake sediments are low in grain size, elemental abundances, delta C-13 and delta O-18 values of carbonates, and total organic carbon and nitrogen, with the exception of one sample (QH-11) from the westernmost part of the northern sub-basin. These characteristics indicate that the spatial variability of the surface sediment across Lake Qinghai is very low in geochemical and silicate mineralogical compositions, with limited differences in the chemical composition of carbonates associated with river water dilution. Sample QH-11 has anomalously high levels of MgO, a high carbonate content, and positive delta C-13 and delta O-18 values in bulk and fine-grained carbonates, probably because of the effect of calcareous tufa. Spatial uniformity in the mineralogical and geochemical compositions of surface sediments in Lake Qinghai can be attributed to the flat topography of the lakebed and stable sediment provenances, the latter dominated by dust deposition and authigenic carbonates. The spatial uniformity and dominance of dust and authigenic aragonite of surface sediments across Lake Qinghai provide a potential record of the hydroclimate in the past, which is associated with changes in the Westerlies and the summer monsoons.

关键词Spatial Distribution Lake Qinghai Surface Sediment Mineralogical And Geochemical Compositions Sediment Provenance Qinghai-tibetan Plateau
WOS标题词Science & Technology ; Life Sciences & Biomedicine
DOI10.1007/s10201-015-0448-5
关键词[WOS]Ne Tibetan Plateau ; Carbon Isotopes ; Organic-carbon ; China ; Climate ; Balance ; Records ; Level
收录类别SCI
语种英语
WOS研究方向Marine & Freshwater Biology
WOS类目Limnology
WOS记录号WOS:000352450600005
出版者SPRINGER JAPAN KK
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9360
专题加速器质谱中心
通讯作者Jin, Zhangdong
作者单位1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Peoples R China
2.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China
3.Chinese Acad Geol Sci, Inst Hydrogeol & Environm Geol, Shijiazhuang 050061, Peoples R China
推荐引用方式
GB/T 7714
Chen, Liu-Mei,Jin, Zhangdong,Wan, Dejun,et al. Spatial uniformity in the mineralogical and geochemical compositions of surface sediments in Lake Qinghai and their controlling factors[J]. LIMNOLOGY,2015,16(2):113-125.
APA Chen, Liu-Mei,Jin, Zhangdong,Wan, Dejun,&Zhang, Fei.(2015).Spatial uniformity in the mineralogical and geochemical compositions of surface sediments in Lake Qinghai and their controlling factors.LIMNOLOGY,16(2),113-125.
MLA Chen, Liu-Mei,et al."Spatial uniformity in the mineralogical and geochemical compositions of surface sediments in Lake Qinghai and their controlling factors".LIMNOLOGY 16.2(2015):113-125.
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