淡水湖泊环境沉积单体脂类生物标志化合物氢同位素组成特征及其成因机制研究

项目名称： 淡水湖泊环境沉积单体脂类生物标志化合物氢同位素组成特征及其成因机制研究

项目编号： No.41272125

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 段毅

作者单位： 中国科学院地质与地球物理研究所兰州油气资源研究中心

项目金额： 95万元

中文摘要： 生物标志化合物氢同位素具有广阔的应用前景，但是其成因特征是目前迫切需要解决的科学问题。本课题通过现代淡水湖泊典型环境中水生生物及其周围陆生植物、现代沉积物样品的脂类化合物单体氢同位素分析，确定淡水湖泊沉积环境中各类生物体和现代沉积物的脂类生物标志化合物单体氢同位素组成特征。通过研究淡水湖泊典型沉积环境中有机质从生物体到早期沉积阶段中脂类生物标志化合物单体氢同位素变化，总结这些生物、沉积物中脂类化合物单体氢同位素组成与水源氢同位素组成和环境因子（如温度、湿度、高度、纬度等）之间的成因关系，确定母质来源、沉积环境、生物合成过程、生物地球化学作用和早期沉积作用对脂类生物标志化合物单体氢同位素组成影响，阐明淡水湖泊相沉积脂类生物标志化合物氢同位素组成特征及其成因机制，为应用研究（如油气地化和环境地化等）提供淡水湖泊中有机质早期沉积阶段的单体脂类生物学标志化合物氢同位素新的基础数据和理论依据。

中文关键词： 淡水湖泊；生物；沉积物；单体生物标志化合物；氢同位素

英文摘要： Hydrogen isotopes of lipid biomarker compounds in sediments have a widely applied prospect. However, their genesis is a scientific question needed to be resolved. This research project will analyze hydrogen isotopes of individual saturated hydrocarbons, fatty acids and alcohols in various kinds of organisms from freshwater lake and its surrounding area as well as from modern sediments from the freshwater lake by means of GC-TC-IRMS. The hydrogen isotopic compositions of lipid biomarkers in organisms from freshwater lake and its surrounding area as well as modern sediments from the freshwater lake will be determined. On the base of the study on the change of hydrogen isotopic compositions of lipid biomarker compounds from organisms to modern sediments and genetic relationships between the hydrogen isotopic compositions of lipid compounds from organisms and modern sediments and hydrogen isotopic compositions of water source as well as environmental factors (temperature, humidity, height and latitude), the functions of organic matter source, sedimentary environment, biosynthetic process, biogeochemistry, and earlier sedimentation on the compositions of hydrogen isotopes of lipid biomarker compounds in organisms and sediments will be demonstrated. Characteristics of hydrogen isotopic compositions of lipid biomarker

英文关键词： freshwater lake；organism；sediment；individual biomarker；hydrogen isotope