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PRISTANE/PHYTANE RATIO IN RECENT MARINE SEDIMENT (SEDIMENTARY LAYER) AND ITS GEOCHEMICAL SIGNIFICANCE

Li Congling (Institute of Marine Geology, Ministry of Geology & Mineral Resources, Qingdao, China, 266071)  
Through analysing materials from well OR) in the western East China Sea and core in the direction of southeastern Tianheng Island in the north of southern Yellow sea, we found that pristane/phytane ratio in recent marine sediments of East China Sea and southern Yellow Sea is less than 1, and the average is between 0.23 and 0.35, but pristane/phytane ratio of organic matter in marine sedimentary rocks is between 0.5 and 3.0. It is concluded that the values of pristane/ phytane ratio are relative to the environment characters of sediments and the maturity of organic matter in the sediments. Environments of reducing, closing and acting anaerobic bacteria are favourable to pristane, and oxidizing environment, open abundant oxygen and acting aerobic bacteria favourable to phytane.
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