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首页> 外文期刊>Journal of Asian earth sciences >The composition and geochemical significance of organic matters in surface sediments from the Southwest Sub-basin of the South China Sea
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The composition and geochemical significance of organic matters in surface sediments from the Southwest Sub-basin of the South China Sea

机译：南海西南子盆地表层沉积物中有机物的组成及地球化学意义

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摘要

Information about ocean evolution and material-energy exchange between the ocean and surrounding continents can be preserved in marine sediments. The Southwest Sub-basin, located among the Xisha Islands, the Zhongsha Islands, and the Nansha Islands, is an ideal tectonic unit to analyze the sedimentary environments of the South China Sea. In this paper, the distribution patterns of lipid biomarkers and their compound-specific stable carbon isotopes in surface sediments from the Southwest Sub-basin of the South China Sea were analyzed. Lipid biomarkers are composed of different proportions of aliphatic hydrocarbons, carboxylic acids, alcohols and series of sterols, indicating that the organic matter of the Southwest Sub-basin was derived from marine bacteria, algae and terrestrial higher plants. The average concentration of total organic carbon (TOC) in the study samples was 0.5 +/- 0.16%. TOC, total n-alkanes, and total carboxylic acids (TFA) decreased gradually from the margins to the center of the sub-basin, whereas the content of total n-alkanols increased. The spatial distribution trends resulted from varying water depths and the contribution of terrestrial organic matter. The concentration of TFA and the TFA/TOC revealed that the accumulation of organic matter in this area was generally low. The strong correlation between TOC and TFA of surface sediments in the study area may be related to a balance between the ocean production and ocean deposition rates.
机译：可以在海洋沉积物中保存有关海洋演变以及海洋与周围各大洲之间的物质-能量交换的信息。西南次盆地位于西沙群岛，中沙群岛和南沙群岛之间，是分析南中国海沉积环境的理想构造单元。本文分析了南海西南子盆地表层沉积物中脂质生物标志物及其化合物特异性稳定碳同位素的分布规律。脂质生物标志物由不同比例的脂族烃，羧酸，醇和一系列固醇组成，表明西南子流域的有机物来自海洋细菌，藻类和陆地高等植物。研究样品中总有机碳（TOC）的平均浓度为0.5 +/- 0.16％。总有机碳，总正烷烃和总羧酸（TFA）从次盆地的边缘到中心逐渐降低，而总正烷醇的含量却增加。空间分布趋势是由不同的水深和陆地有机物质的贡献引起的。 TFA和TFA / TOC的浓度表明该区域有机物的积累通常较低。研究区域表层沉积物的TOC和TFA之间的强相关性可能与海洋产量和海洋沉积率之间的平衡有关。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第3期|103-117|共15页
  • 作者

    Wan Zhifeng; Wang Xianqing; Li Yongfang; Xu Xing; Sun Yuefeng; Yin Zhengxin; Guan Hongxiang;

  • 作者单位

    Sun Yat Sen Univ, Sch Marine Sci, Guangdong Prov Key Lab Marine Resources & Coastal, Engn Lab Offshore Oil Explorat & Dev,Guangdong Hi, Guangzhou 510006, Guangdong, Peoples R China|Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA;

    Sun Yat Sen Univ, Sch Marine Sci, Guangdong Prov Key Lab Marine Resources & Coastal, Engn Lab Offshore Oil Explorat & Dev,Guangdong Hi, Guangzhou 510006, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Marine Sci, Guangdong Prov Key Lab Marine Resources & Coastal, Engn Lab Offshore Oil Explorat & Dev,Guangdong Hi, Guangzhou 510006, Guangdong, Peoples R China;

    Minist Land & Resources, Guangzhou Marine Geol Survey, Guangzhou 510075, Guangdong, Peoples R China;

    Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA;

    State Ocean Adm, South China Sea Marine Survey & Technol Ctr, Guangzhou 510275, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Surface sediments; Organic matter; Aliphatic hydrocarbons; Fatty acids; Alcohols; Southwest Sub-basin of the South China Sea;

    机译：表层沉积物;有机物;脂肪烃;脂肪酸;酒精;南海西南次盆地;

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