中文摘要：

松辽盆地发育了一套连续的晚白垩世陆相沉积地层,是研究古气候/环境的理想场所。本研究以松辽盆地露头剖面为研究材料,通过测定总有机碳（TOC）含量、稳定碳同位素（δ~（13） Corg）组成和一些分子标志物,并分析它们在整个剖面的分布和变化特征,重建了松辽盆地晚三冬期的气候环境变化。结果显示：（1）松辽盆地晚三冬期湖泊沉积物有机质丰度表现出阶段Ⅰ和Ⅲ高,阶段Ⅱ和Ⅳ相对较低的特征,主要受水生生物繁盛程度和保存条件的控制。阶段Ⅰ和Ⅲ,较高TOC值、相对偏负δ~（13） Corg值和分子标志物（正构烷烃、C_（30）甾烷系列化合物和藿烷）组成和分布显示有机质来源于藻类、细菌和陆地植物;阶段Ⅱ高丰度中碳数正烷烃分布特征表明有机质主要来源于水生生物;阶段Ⅳ持续偏正δ~（13） Corg值显示出来源于陆地有机质输入逐渐增加。（2）Pr/Ph值的变化显示松辽古湖泊晚三冬期水体从还原变到氧化,再到还原,再逐渐变为氧化的环境变化过程;阶段Ⅰ和Ⅱ高Ga/C_（30）Hop值显示嫩江组一段存在显著的水体分层。（3）C_（30）甾烷系列化合物（24-正丙基胆甾烷、24-异丙基胆甾烷和甲藻甾烷）的检出表明松辽盆地晚三冬期发生了海侵事件。阶段ⅢC_（30）甾烷含量显著高于阶段Ⅰ表明嫩江组二段下部的海侵程度显著强于嫩江组一段。此外,高C_（30）甾烷含量对应于高TOC值,显示出海侵发生的层位与烃源岩发育的层位吻合。

英文摘要：

The Late Cretaceous period was characterized by greenhouse climate,however,much of what we know about geological records came from marine sediments,few studies of terrestrial sediments.The Songliao Rift Basin is located in Northeast China developing a continuous Upper Cretaceous lacustrine stratigraphy,which offers a unique opportunity to understand Late Cretaceous terrestrial paleoenvironment.In the study,the samples were collected from outcrops of Yaojia Station section,Houjingou section and Yuewangcheng section.The total organic carbon（TOC）content,stable carbon isotopic composition（δ~（13） Corg）and the distribution of molecular markers（aliphatic hydrocarbons,regular steranes,C_（30） steranes,hopanes）of these samples were characterized to reconstruct the paleoenvironment of late Santonian lacustrine deposits（Member1and 2of Nenjiang Formation）in the southeastern side of Songliao Basin.The results show：（1）the TOC values ranged from 0.06%-6.86%,showing higher TOC values at stageⅠ and Ⅲ and lower TOC values at stageⅡandⅣ.Higher TOC values,depletedδ~（13） Corgvalues and molecular marker distribution（n-alkanes,C_（30） steranes,hopanes）at stage Ⅰ and Ⅲ indicated that organic matter（OM）sourced from algae,bacteria and land plants.Relatively heavierδ~（13） Corgvalues and abundant mid-chain n-alkanes indicated the OM at stage Ⅱoriginated mainly from aquatic macrophytes and land plants.At stage Ⅲ and Ⅳ the OM sourced from a mixture of algae,bacteria and higher land plants.The increasing heavierδ~（13） Corgat stageⅣ demonstrated that increasing land plant input.（2）Higher TOC values and lower Pr/Ph values at stageⅠandⅢshowed that the deposition environment was anoxic and conducive to the preservation of OM.Higher Ga/Hop-αβC_（30） values at stageⅠ and Ⅱindicated that the water column was stratified during this time.（3）Dinostanes,24-n-propylcholestanes and 24-iso-propyl-cholestanes were detected in Member 1and 2of Nenjiang Formation im