渤海湾盆地石炭二叠系稀土元素特征及其地质意义  

REE Characteristics and Its Geological Significance of the Permo-Carboniferous in Bohaiwan Basin

作　　者：李军[1] 桑树勋[1] 林会喜[2] 陈世悦[3] 苗耀[1] 杨勇[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008 [2]胜利油田有限公司地质科学研究院,山东东营257015 [3]中国石油大学地球与信息科学学院,山东东营257000

出　　处：《沉积学报》2007年第4期589-596,共8页Acta Sedimentologica Sinica

基　　金：国家重点基础研究发展规划项目(2002CB211703)资助;国家油气专项(XQ-2004-03)资助

摘　　要：采集了渤海湾盆地周缘露头剖面和盆内钻井岩心的泥岩及少量灰岩样品,采用电感耦合等离子质谱技术对样品进行了系统的稀土元素测试分析。测试样品稀土总量平均值为290.39μg/g,明显大于北美页岩组合样。各样品δEu为0.42～0.83,平均0.67,中度Eu负异常;大多样品Ce含量正常,δCe为0.51～1.22,平均0.97。稀土元素配分模式总体为轻稀土富集、重稀土亏损型,轻稀土段曲线明显"右倾",重稀土段则较为"平坦"。灰岩及部分泥岩中Ce的负异常指示了晚石炭世本区陆表海的沉积环境特点,古海水为氧化环境。根据稀土元素的Eu异常及总的元素组合特点,判断渤海湾盆地石炭—二叠系沉积物主要来自盆地北缘的阴山古陆,母岩类型为花岗岩。An ICP-MS method is used to determine the contents of rare earth elements of Carboniferous and Permian sedimentary rocks in Bohaiwan Basin. The average REE content of every sample is 290.39 μg/g, and it is obvious higher than the North American shale sample. The δEu is 0.42-0. 83, and the average is 0.67, and the samples are lack of Eu. Most samples content nomal Ce, and δCe is 0.51-1.22, and the average is 0.97. The rare earth element patterns indicate that the LREE is rich and the HREE is lack, and the HREE patterns are fiat. The lack of Ce indicates the ancient water of the upper Carboniferous is oxidable. According to the values of δEu and the REE content and its variation, the material source of Carboniferous and Permian in Bohaiwan Basin was from the Yinshan ancient continent and its province is granite.

关 键 词：稀土元素 石炭-二叠系 古环境 物源 渤海湾盆地 

分 类 号：P512.2[天文地球—地质学] P595