辽东半岛复州湾十三里台组地球化学特征及沉积环境探讨  

Discussion on Characteristics of Geo-Chemical and Sedimentary Environments of the Shisanlitai Formation of Fuzhou Bay,Liaoning Province

作　　者：刘燕学[1] 宋天锐[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《沉积学报》2009年第5期1018-1026,共9页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:40672082)资助

摘　　要：系统测试和研究了辽东半岛复州湾十三里台组常量元素、微量元素和稀土元素地球化学数据,结果表明:Fe2O3/FeO均大于或接近于2,δEu均小于1,Ceanom除一个样品外,均小于0,U/Th比值均小于0.75,V/Cr比值均小于2,Ni/Co比值均小于5,反映强氧化环境,表明十三里台组沉积时水体很浅。其中十三里台组中的泥岩是一种富K、SiO2和LREE的特殊泥岩,为自生独居石的形成提供了充足的物质来源,泥岩的CaO含量极低,小于0.68%,CaO/MgO小于0.6,Sr/Ba小于0.33,反映成岩时盐度十分低,为淡水沉积,沉积环境可能为叠层石礁后的淡水潟湖。从大地构造演化、沉积发展史和稀土元素元素特征分析,十三里台组沉积时的大地构造环境处于Rodinia超大陆形成到裂解之间的稳定时期。It is demonstrated by a series of measured data on chemical elements, rare elements and REE elements of the Shisanlitai Formation as follows： Fe2O3/FeO near or more than 2, 8Eu less than 1, despite one sample of Ceanom less than 0, U/Th ratio less than 0. 75, V/Cr less than 2, Ni/Co less than 5, all of those reflect a high oxidation environment, which is caused by shallow water body of the Shisanlitai Formation. A rich K, SiO2 and REE special mudstone of the Shisanlitai Formation offered plenty of materials for the formation of authegenic monazite. The mudstone contains low CaO less than 0.68% , CaO/MgO less than 0.6, Sr/Ba less than 0.33, which reflect low salinity during diagenetic stage, might be a fresh water lagoon back stromatolite reef environment. The tectonic environment might be a stable stage after Rodinia supper continent crack stage in the Shisanlitai Formation stage.

关 键 词：辽东半岛 十三里台组 地球化学 沉积环境 独居石 

分 类 号：P595[天文地球—地球化学]