n-alkanes and Corbicula Fossils in Shell Bar Section of the Qarhan Lake , Qaidam Basin
详细信息
- 责任者：Yang Mingsheng (School of Environmental and Chemical Engineering ; Key Laboratory of Poyang Lake Environment and Resource Utilization of MOE ; Nanchang University ; Nanchang 330031 ; China) ; Zhang Hucai
- 刊名：Acta Geoscientica Sinica
- 出版年：2011
- 卷期：32(1)
- 关键词：球蚬 ; Sphaerium ; 古生态学 ; paleoecology ; 晚第四纪 ; Late Quaternary ; 柴达木盆地 ; Qaidam Basin
- 页码：p.87-94
- 图表：3 illus., 1 table, 32 refs.
- 分类号：1400
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
The shell bar section of the Qarhan Lake in Qaidam Basin was systematically dated by means of accelerator mass spectrometry (AMS) and conventional radiocarbon dating, and the contrastive analyses of the dating results of various components from different laboratories show that the shell bar section does record the change of high paleolake level of Qarhan (39.7 ka B.P.～17.5 ka B.P.). A series of biomarkers were identified, which included n-alkanes, oxygen-containing organic compounds (fatty acid, n-alkane-2-ones), nitrogen-containing organic compounds (amide, nitrile), polycyclic aromatic compounds etc.The n-alkanes contain very essential information concerning the environment and vegetation during the lake evolution, of which the nC27/nC31 reveals proportionally the evolution of terrestrial woody and herbaceous vegetation, that is, the proportion of woody and herbaceous vegetation changed relatively significantly before the high paleolake level, and insignificantly during the high paleolake level. L/H, nC17/nC31 and nC21-/nC22+ reveal the change of aquatic organisms in the lake, and are more sensitive to climate change than nC27/nC31.
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