长江口沉积物中正构烷烃的分布特征及其环境指示意义

对长江口 4个柱状岩芯沉积物中的正构烷烃进行了分析研究.结果显示,这4个岩芯中的正构烷烃分别来源于不同的物源输入.来源于不同种类陆源输入的正构烷烃的比值反映了长江流域呈现出寒、暖期交替出现的气候条件,且主要以暖湿气候为主.长江口4个岩芯沉积物中的长链正构烷烃没有经过明显的成岩演化,而短链正构烷烃较低的CPI值则更多的归因于其主要来源于化石燃科的不完全燃烧产物.

The distribution and environmental significance of n-alkanes in the Changjiang River Estuary sediment

The n-alkanes in four sediment cores from the Changjiang River Estuary were determined to originate from different organic matter inputs. The n-alkanes from different terrestrial inputs reveal an alternating cool and warm climate over time in the Changjiang River drainage area, which is prevailingly warm and humid. The long chain n-alkanes in the four sediment cores have not endured obvious diagenesis. The short chain n-alkanes were mainly products of incomplete fossil fuel combustion.