松辽盆地沙河子组上段(Aptian期)黑色泥页岩有机质来源及其沉积环境  

Organic matter source of black mud shale in upper Shahezi Formation(Aptian Stage),Songliao Basin and its sedimentary environment

作　　者：王鹏 单玄龙[1] 贺文同[1] 范代军 时玉芹 WANG Peng;SHAN Xuanlong;HE Wentong;FAN Daijun;SHI Yuqin(College of Earth Science,Jilin University,Changchun 130061,China;No.3 Geological Survey Institute of Jilin Province,Siping 136000,Jilin,China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林省第三地质调查所,吉林四平136000

出　　处：《世界地质》2022年第2期307-314,共8页World Geology

基　　金：国家自然科学基金项目(42002153)。

摘　　要：在地质特征分析基础上,利用有机地球化学、稳定同位素地球化学与微量元素等方法指示松辽盆地晚Aptian期沙河子组上段沉积物中有机质来源、沉积物在湖泊沉积时所处的氧化还原状态以及古气候变化。研究发现沙河子组上段黑色泥页岩中有机质来源主要为浮游微型藻类、沉水植物等湖泊生物,含部分的陆源有机质供给;当时气候为温暖湿润气候;水体沉积环境由正常水体逐渐转变为缺氧还原的湖泊沉积环境。Based on the analysis of geological characteristics,this study used organic geochemistry,stable isotope geochemistry and trace elements to indicate the source of organic matter in the sediments from the upper member of the late Aptian Shahezi Formation within the Songliao Basin,the redox state of the sediments during lake deposition,and the paleoclimate change.It is found that the organic matter in the black mudshale of the upper Shahezi Formation is mainly derived from planktonic microalgae,submerged plants and other lake organisms,including some terrestrial organic matter supply.At that time,the climate was warm and humid,and the sedimentary environment of water body gradually changed from normal water body to anoxic reduction lake sedimentary environment.

关 键 词：松辽盆地 沙河子组 碳、氮同位素 有机质来源 古气候 古环境 

分 类 号：P618.13[天文地球—矿床学]