REE Characteristics and Its Geological Significance of the Permo Carboniferous in Bohaiwan Basin
-
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290.39 μg/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。Abstract: An ICPMS 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 0.420.83, and the average is 0.67,and the samples are lack of Eu. Most samples content nomal Ce, and δCe is 0.511.22,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 flat. 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.
-
Key words:
- REE /
- Carboniferous and Permian /
- palaeoenvironment /
- material source /
- Bohaiwan Basin
-
点击查看大图
计量
- 文章访问数: 1912
- HTML全文浏览量: 78
- PDF下载量: 702
- 被引次数: 0
下载:
