摘要
重点研究南海沉积物中烃类化合物的有机地球化学特征，讨论了南海沉积物中有机物质的分布和来源。其中正构烷烃分布在Ｃ１６－Ｃ３３奇偶优势不明显，结合其轻重比值，显示有机质的输入在大部分站位以海洋源为主，在一些站位陆源输入的贡献也比较明显，海源输入中又以藻类等有机碎屑的贡献最大。在南海沉积物中共检出６０余种环芳烃，高环化合物（四环和五环）的总含量明显高于其他组分。一些陆源特征标志物如惹烯、烷基屈等化合物被检出，在大多数样品中都发现有的存在，推测其可能来源应是燃烧产物，而非陆源输入。
Organic geochemical measurments of the lipid fraction, including n alkanes (n ALKs) and polycyclic aromatic hydrocarbons (PAHs), have been carried out on twelve surficial sediments collected from the South China Sea. The distribution of n alkanes (n ALKs) indicated the predominance of marine autochthonous sources of organic matter at most stations, among which, microbial altered algal detritus was the major contribution. The terrestrial plant input was also confirmed from some stations. About sixty polycyclic aromatic hydrocarbons (PAHs) have been identified from the sediments, of which tetra and pentacyclic aromatic hydrocarbons are higher than other spieces. Several compounds of natural origin were also found, such as retene and chrysene derivatives. Perylene was found in sediments from most stations, which may stem from pyrogenic products instead of natural origins.
