globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.01.014
论文题名:
Trace element variability in single ostracod valves as a proxy for hydrochemical change in Nam Co, central Tibet, during the Holocene
作者: Yang Q.; Jochum K.P.; Stoll B.; Weis U.; Börner N.; Schwalb A.; Frenzel P.; Scholz D.; Doberschütz S.; Haberzettl T.; Gleixner G.; Mäusbacher R.; Zhu L.; Andreae M.O.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 399
起始页码: 225
结束页码: 235
语种: 英语
英文关键词: Holocene ; Nam Co ; Palaeohydrochemistry ; Shell chemistry ; Tibetan Plateau ; Trace element
英文摘要: Ostracod shells, belonging to three taxa (Leucocytherella sinensis Huang, 1982, ?Leucocythere dorsotuberosa Huang, 1982 and ?L. dorsotuberosa f. postilirata sensu Pang, 1985), were collected from two sediment cores from Lake Nam Co, on the central Tibetan Plateau. Two variants of LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry), spot and line-scan analyses, were used to investigate trace element concentrations (Mg, Sr, Ba, U and rare earth elements [REEs]) in single ostracod shells. The results suggest that the line-scan method can provide better precision than the spot analysis and is therefore preferred. No significant difference in trace element composition between taxa was detected in our study. Fluctuations of Mg/Ca and Sr/Ca in the shells show good agreement with the reported lake level changes during the Holocene, indicating that ostracod Mg and Sr can be related to palaeohydrochemical processes in this area. A high correlation between Ba/Ca and Sr/Ca was detected in our study, perhaps implying that both metals were controlled by the same mechanisms. A possible relationship between ostracod U/Ca and the past redox conditions on the lake bottom is discussed. Relatively low and constant La/Ca was observed, which could be due to the REE characteristics in the lake water, or ostracod biological processes, or even the associated Fe-Mn and/or organic contaminants. Future studies on more specimens from this area, especially shells from living ostracods, are essential to investigate the potential of ostracod Ba, U and REEs for use as palaeoenvironmental indicators. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69424
Appears in Collections:过去全球变化的重建

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作者单位: Biogeochemistry Department, Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany; Institut für Geosysteme und Bioindikation, Technische Universität Braunschweig, Langer Kamp 19c, 38106 Braunschweig, Germany; Institute of Geosciences, Friedrich-Schiller-University Jena, Burgweg 11, 07749 Jena, Germany; Institut für Geowissenschaften, Johannes-Gutenberg-Universität, J.-J.-Becher-Weg 21, D 55099 Mainz, Germany; Department of Physical Geography, Institute of Geography, Friedrich-Schiller-University Jena, Löbdergraben 32, 07743 Jena, Germany; Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany; Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101 Beijing, China

Recommended Citation:
Yang Q.,Jochum K.P.,Stoll B.,et al. Trace element variability in single ostracod valves as a proxy for hydrochemical change in Nam Co, central Tibet, during the Holocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,399
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