(Table 2) Composition of polycyclic aromatics in bottom sediments from the Weddell Sea@en

Distribution, composition and genesis of organic matter in recent bottom sediments of the Weddell Sea (Western Antarctic) are discussed. Geochemical background levels of bitumen, organic matter, and polycyclic aromatics in the sediments are respectively 0.01-0.1%, 0.003-0.005%, and 0.0001-0.0002%. Deviations from the background level, probably caused by secondary processes, are found. Organic matter has characteristic properties resulting from distinctive character of aquatic biota organic matter, from which it has been formed.本文探讨了西南极洲威德尔海（Weddell Sea）现代海底沉积物中有机质的分布、组成及成因。该沉积物中沥青（bitumen）、有机质及多环芳烃（polycyclic aromatics）的地球化学背景值分别为0.01%~0.1%、0.003%~0.005%与0.0001%~0.0002%。研究发现存在偏离背景值的现象，该偏差大概率由次生作用所致。该有机质由水生生物有机质形成，因此具备其特有的属性特征。