湖泊沉积物中污染有机质及碳酸盐的δ13C影响因素分析

摘要：本文以松嫩平原湖泊表层沉积为研究对象。通过对沉积物有机质正构烷烃组分的分析，了解湖泊中有机质的来源和沉积环境。结合湖泊水介质和沉积物特征，综合分析了沉积物有机质和碳酸盐碳同位素组成的影响因素。结果显示出湖泊沉积物中不同有机质类型对碳同位素组成有较大的作用，生物有机质的大量输入使碳酸盐的碳同位素组成明显偏轻，而石油类污染的输入对应于碳酸盐中的碳同位素组成稍偏重。

The influencing factors of δ13C of organic matter and carbonate in lake sediments

Abstract: It is an organic matter and carbonate carbon isotopic composition study on surface lake sediments from lakes in Songnen Plain, northeast of China. To identify the source of organic matter and sedimentary environment in lakes, we analyzed the n-alkanes carbon distribution characteristics of the organic matter in the lake sediments. With the analysis of the lacustrine water medium and sediment characteristics, we obtained the influencing factors of isotopic composition in sedimentary organic matter and carbonate. The results show that different types of organic matter have a great effect on the carbon isotopic composition. δ13C of carbonate become lighter by biologic organic matter, whereas it will be a little heavier when organic matter comes from oil pollution.