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对南沙海洋现代沉积物中单体长链正构烷烃碳同位素进行了测定,研究了单体正构烷烃碳同位素组成特征及其成因问题.结果表明,它们的碳同位素组成较轻,具有混源成因的特征,经研究认为低纬度高等植物和微生物是它们的主要端元生物源.根据单体正构烷烃丰度和碳同位素组成,采用混合模型定量计算了两种端元生物源对单体正构烷烃的贡献.所获资料指示了两种生物源在不同样品中的贡献是不同的,趋势是随着埋深,微生物生物源贡献增大.
The carbon isotopes of long chain n-alkanes in modern sediments of the Nansha Sea were measured, and the carbon isotope composition and nomenclature of the n-alkanes were studied. The results show that their carbon isotope composition is light, According to the study, the low-latitude plants and microorganisms are their main end-organism sources.According to the monomer n-alkane abundance and carbon isotope composition, The contribution of n-paraffins The data obtained indicate that the contribution of the two biological sources in different samples is different, with the trend of increasing the contribution of microbial organisms with depth.