Chemical and Compound-Specific Carbon Isotopic Characteristics of N-Alkanes in the Qarhan Salt Lake
详细信息
- 责任者：Guo Jinchun (State Key Laboratory of Organic Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Liu Qinghao
- 刊名：Geochimica
- 出版年：2010
- 卷期：39(6)
- 关键词：盐湖 ; salt lakes ; 正烷烃 ; n-alkanes ; 碳同位素 ; carbon isotopes ; 察尔汗盐湖 ; Qarhan Salt Lake
- 页码：p.566-573
- 图表：4 illus., 36 refs.
- 分类号：1400
- issnNo：ISSN0379-1726
- isbnNo：CN44-1398/P
摘要
Molecular biomarkers,including n-alkanes, n-alcohols and n-alkanoic acids, were identified in the core sediments taken from the Qarhan Salt Lake by GC/MS analysis. The distribution of n-alkanes was mainly discussed in this paper. The n-alkanes exhibited strong odd-over-even carbon number predominance and the main peak at C31, suggesting that they were derived from terrestrial higher plants. The distribution of n-alkanes indicated that the grass vegetation was dominated in the Qarhan Salt Lake area during 110.1 to 50.1 ka B.P. In addition, the compound-specific carbon isotopic composition was determined for C27, C29 and C31 n-alkanes in the core. Relative contribution of C3 and C4 plants was estimated by using a binary model, indicating that C3 plants are a dominant input.
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