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报道了北极楚科奇海和白令海沉积物中正构烷烃的含量和分布类型 ,并通过因子分析方法对正构烷烃的来源和古沉积环境加以初步探讨 .研究结果表明 ,正构烷烃碳数分布范围多数在nC15～nC3 3 之间 ,分布类型有两种 ,第 1种高分子碳范围 ,MH为nC2 5～nC2 7,CPI大于 1,奇偶优势显著 .第 2种低分子碳范围 ,MH为nC17～nC2 0 ,奇偶优势不明显 .以上特征指示了正构烷烃来源于陆源高等植物和海洋内生两个部分 ,并且以陆源贡献最大 .楚科奇海和白令海大部分测站的Pr/Ph小于 1,指示了缺氧还原沉积环境 .因子分析结果与样品中正构烷烃不同分子组成特征相互对应 .
The types and distribution types of n-alkanes in the sediments of the Chukchi Sea and Bering Sea were reported and the origin of n-alkanes and the paleo-sedimentary environment were analyzed by factor analysis.The results show that the n-alkanes range The majority of nC15 ~ nC3 3, there are two types of distribution, the first kind of polymer carbon range, MH nC2 5 ~ nC2 7, CPI greater than 1, significant parity advantages .Second low molecular carbon range, MH nC17 ~ NC 2 0, the odd-even advantage is not obvious.The above characteristics indicate that n-alkanes come from two parts of higher terrestrial plants and marine endophytes, and have the largest contribution from terrestrial sources.The Pr / Ph of most stations in Chukchi Sea and Bering Sea is less than 1, indicating the anoxic reduction sedimentary environment.The factor analysis results correspond to the different molecular compositional features of n-alkanes in the sample.