准噶尔盆地东南缘芦草沟组油页岩元素地球化学特征及沉积环境指示意义  

Geochemical Characteristics of the Lucaogou Formation Oil Shale in the Southeastern Margin of the Junggar Basin and Its Environmental Implications

作　　者：彭雪峰[1] 汪立今[1] 姜丽萍[1] 

机构地区：[1]新疆大学地质与勘查工程学院,乌鲁木齐830047

出　　处：《矿物岩石地球化学通报》2012年第2期121-127,151,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40862004);新疆重点学科矿产普查及勘探建设项目资助;新疆高校科学研究重点项目(XJEDV2007I09)联合资助

摘　　要：本文通过XRF和ICP-MS测试方法对油页岩样品进行测试,根据常量元素和微量元素特征、组分含量及某些元素的比值,探讨了研究区油页岩样品的地球化学特征,进一步阐述了其沉积环境的指示意义。结果表明,P和B元素强烈富集,相当硼及古盐度值都表明属于半咸水沉积环境,B/Ga、Sr/Ba值也说明受到海水影响或间歇性受海水影响,沉积环境以半咸水湖泊为主;Fe2+/Fe3+、V/(V+Ni)、V/Ni、Cu/Zn、Ni/Co和U/Th值及Ni的含量说明沉积环境为咸化的弱还原-还原环境;Mn/Fe和Mn/Ti值也较小,反映近岸的沉积环境;Sr/Cu表明主力油页岩形成时期处于温湿-干热气候。总体上反映出,研究区油页岩的沉积介质环境的显著特征是半咸水状态的弱还原-还原环境。On the basis of XRF and ICP-MS analyses for the Lucaogou Formation oil shale samples,this paper investigated geochemical characteristics,including,features of major and trace elements,elements contents and several element-ratios,of the oil shale samples and discussed their implications on rebuilding sedimentary environment history.The results showed that P and B are significantly enriched,together with the value of paleosalinity,indicate a brackish water sedimentary environment;the ratios of B/Ga and Sr/Ba show that the sedimentary environment was affected or intermittently affected by sea water;the ratios of Fe2＋/Fe3＋,V/（V＋Ni）,V/Ni,Cu/Zn,Ni/Co and Ni illustrate that sedimentary environment is a salinized weak reducing to reducing environment;the ratios of Mn/Fe and Mn/Ti are small reflecting a near shore sedimentary environment;Sr/Cu value shows that the climate of the main formation period was warm/humid-dry/hot.In summary,the sedimentary environment of oil shale forming can be characterized as brackish water weak reducing-reducing sedimentary environment.

关 键 词：准噶尔盆地东南缘 油页岩 元素地球化学 沉积环境 

分 类 号：P618.12[天文地球—矿床学]