松辽盆地嫩江组下部水体分层的有机地球化学证据  

The organic geochemical evidences for the lake water stratification in Lower Nenjiang Formation,Songliao Basin

作　　者：刘美羽 胡建芳[1] 万晓樵[2] 

机构地区：[1]中国科学院广州地球化学研究所,广州510640 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《湖泊科学》2015年第1期190-194,共5页Journal of Lake Sciences

基　　金：国家重点基础研究发展计划"973"项目(2012CB822002);国家自然科学基金项目(41372110)联合资助

摘　　要：通过对松科1井样品的测试分析,在松辽盆地姚家组二、三段顶部至嫩江组二段底部地层中检测到了较高含量的伽马蜡烷,并据此确认了对应时期水体分层事件的存在.通过其与总有机碳(TOC)值和δ13Corg值剖面变化趋势比对发现,伽马蜡烷含量的高值与TOC高值和δ13Corg负值对应良好,表明水体分层在一定程度上促进了嫩江组沉积时期缺氧事件的发生,进而对有机质的保存起到了积极的作用.这种水体分层与当时的海侵事件密切相关.By the analysis of samples from SK-1,high content gammacerane was detected in the strata from the top of the 2ndand 3rd member of Yaojia formation to the bottom of the 2ndmember of Nenjiang Formation,Songliao Basin,which suggesting that water stratification occurred during this period. Compared with the total organic carbon（ TOC） and δ13Corgdata,the high contents of gammacerane correspond well with the high values of TOC and the negative values of δ13Corg. This correspondence suggests that water stratification led to the anoxic environment in the Songliao Paleo-lake,which contributed to the preservation and deposit of organic matter during the sedimentary period of Nenjiang Formation. It is inferred that the water stratification is related to the marine incursion in the Songliao Basin.

关 键 词：松辽盆地 伽马蜡烷 水体分层 嫩江组 总有机碳 

分 类 号：P593[天文地球—地球化学]