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| 东海盆地丽水凹陷古新统沉积岩的稀土元素地球化学特征 | |
| 引用本文： | 刘俊海,杨香华,于水,吴志轩,加东辉.东海盆地丽水凹陷古新统沉积岩的稀土元素地球化学特征[J].现代地质,2003,17(4):421-427. |
| 作者姓名： | 刘俊海 杨香华 于水 吴志轩 加东辉 |
| 作者单位： | 1. 中国地质大学 资源学院,湖北,武汉,430074 2. 中国科学院 海洋研究所,山东,青岛,266071 3. 中国海洋石油研究中心,上海,200030 |
| 基金项目： | 国家自然科学基金项目(G2000046700)。 |
| 摘 要： | 采用等离子体质谱分析法测试了东海盆地丽水凹陷古新统砂泥岩样品的稀土元素含量,结果表明,稀土总量在82 2×10-6～182×10-6之间,平均为144×10-6;w(LREE)/w(HREE)比值在4 54～10 02之间,平均为8 67,相对富集LREE;Eu基本为负异常,δEu在0 59～1 03之间,平均为0 73;δCe在0 92～1 09之间,平均为0 98,Ce正常或具微弱的负异常;(w(La)/w(Yb))N在8 23～11 61之间,样品的分布曲线为轻稀土元素富集、重稀土元素亏损型。样品稀土元素的地球化学特征反映当时丽水凹陷为海陆交替的沉积环境,水介质环境为缺氧的还原条件,盆地类型应为稳定的克拉通盆地,物源区母岩主要为花岗岩。 |
| 关 键 词： | 稀土元素 古环境 物源 丽水凹陷 东海盆地 |
| 文章编号： | 1000-8527(2003)04-0421-07 |
| 修稿时间： | 2003年8月10日 |
THE REE GEOCHEMICAL CHARACTERISTICS OF PALEOCENE-EOCENE IN THE LISHUI SAG OF THE DONGHAI BASIN |
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| LIU Jun-hai,YANG Xiang-hua,YU Shui,WU Zhi-xuan,JIA Dong-hui.THE REE GEOCHEMICAL CHARACTERISTICS OF PALEOCENE-EOCENE IN THE LISHUI SAG OF THE DONGHAI BASIN[J].Geoscience——Journal of Graduate School,China University of Geosciences,2003,17(4):421-427. | |
| Authors: | LIU Jun-hai YANG Xiang-hua YU Shui WU Zhi-xuan JIA Dong-hui |
| Institution: | LIU Jun-hai~1,YANG Xiang-hua~2,YU Shui~3,WU Zhi-xuan~3,JIA Dong-hui~1 |
| Abstract: | An ICP-MS(Inductively Coupled Plasma-Mass Spectrometry) method is used to determine the contents of rare earth element of Paleocene-Eocene samples in the Lishui sag. The result shows that the REE content ranges from 82.2×10~-6) to 182×10~-6),and the contents of most samples approach the average of REE contents in sediments in the world; The REE distribution pattern of samples is characterized by a"V-shape") curve with slightly negative Ce anomaly and obviously negative Eu anomaly.The fractionation pattern is right-declined,and LREE are obviously richer.According to the REE content and its variation,the rare earth element pattern indicates that its provenance is the mixing of claystone and granite. According to the values of _δ_Ce, the authors suggest that the paleo-environment is mainly marine and sometimes continental environment. |
| Keywords: | rare earth element palaeoenvironment provenance the Lishui sag the Donghai basin |
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