| 摘要: |
| 下扬子区二叠系为一套碳酸盐岩、硅质岩和陆源碎屑岩的混合沉积。对灰岩、白云岩、硅质岩和泥质岩进行系统的稀土元素、微量元素分析,依据分析结果论述其成因特征。 |
| 关键词: 下扬子区 二叠纪 岩石成因 地球化学信息 |
| DOI： |
| 附件 |
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| 基金项目: |
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| geochemistry of the Permian sedimentary rocks in the Lower Yangtze area |
| Du Xiaodi, Huang Zhicheng, Chen Zhina, Liu Jiarun |
(1 Exploration Bureau, China National Oil and Gas Corporation;
2 Department of EarthSciences, Nanjing University) |
| Abstract: |
| The Permian strata is a complex suite of carbonate rocks,siliceous rocks and terrigenous clastic rocks. These rock types differ greatly in REE compositions. The REE amount is highest in argillized pyroclastic rocks,followed by mudstone,radiolarian siliceous rocks, dolostones,limestones,and lowest in metasomatic chert rocks. Judging from the Trace element compositions, the bulk of mudstones are characterized by the lithophile elemental negative anomaly,chalcophile elemental normal anomaly and siderophile elemental negative anomaly; the limetones by the chalcophile elemental normal anomaly, lithophile and siderophile elemental normal anomaly or negative anomaly, and the dolostones by the lithophile,chalcophile and siderophile elemental normal anomaly. The authors contend that the geochemical parameters such as REE and trace elements are helpful to the genetic interpretation of sedimentary rocks. |
| Key words: Lower Yangtze area Permian sedimentary rock genesis geochemical information |
