摘要
青海湖是我国最大的内陆咸水湖泊.对这种湖泊沉积物中正构烷烃及其氢同位素进行了分析,研究了沉积物中正构烷烃及其同位素组成,并且与青海湖水生植物及其周围陆生植物的研究结果进行了对比,研究了它们的成因.结果显示了青海湖表层和柱状沉积物中正构烷烃分布都是类似的,其特征反映了它们起源于湖泊周围陆生草本植物.青海湖表层沉积物中正构烷烃氢同位素组成特征也与柱状沉积物中的类似,沉积物样品中正构烷烃氢同位素的组成和分布特征反映了它们主要来自陆生草本植物.从而进一步证实了水体中沉积物的正构烷烃氢同位素组成,反映了生物源的氢同位素组成,后者与古气候相关,因此沉积物的正构烷烃氢同位素组成可以指示古气候.
The Qinghai Lake is the largest saline lake in China. We study the compositions of n-alkanes and their hydrogen isotope in sediments from the lake,and discuss the genesis of their compositions by the comparison with previous study results of plants from the lake and its surrounding areas. Our results show that the n-alkanes in the surface and core sediments have a similar distribution which reflects the source from terrestrial herbaceous plants in the surrounding regions of the lake. The hydrogen isotopic compositions of n-alkanes in the surface and core sediments are also similar,which indicates that n-alkanes in the sediments were derived from terrestrial herbaceous plants in surrounding regions of the lake. This study further demonstrates that the hydrogen isotopic compositions of n-alkanes in lake sediment reflect the biological source hydrogen isotopic signals that are related to paleoclimate. Therefore,δD values of n-alkanes in lake sediment can be used to indicate paleoclimate.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2011年第1期53-61,共9页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金(Nos.40772069
40872092)
国家重点基础研究发展规划"973"项目(No.2005CB422105)
关键词
地球化学
咸水湖泊
沉积物
正构烷烃分布
氢同位素组成
成因
geochemistry
saline lake
sediment
distribution of n-alkane
hydrogen isotopic composition
genesis.
