| 下扬子区二叠纪主要岩石类型成因的地球化学信息 |
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| 引用本文： | 杜小弟,黄志诚,陈智娜,刘家润.下扬子区二叠纪主要岩石类型成因的地球化学信息[J].沉积与特提斯地质,1998,18(1):61-67. |
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| 作者姓名： | 杜小弟 黄志诚 陈智娜 刘家润 |
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| 作者单位： | 长春科技大学资源学院 |
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| 摘 要： | 作者在全面了解陆相层序地层学研究现状的基础上，认为陆相层序及体系域发育仍受控于湖平面相对变化。构造、气候及沉积物供给的控制作用最终通过湖平面变化表现出来。而湖平面变化可分完整旋回与不完整旋回两种情况，进而提出了所形成的层序及体系域模式：在完整旋回中形成了湖泊充填、湖泊扩张、湖泛和湖泊萎缩四个体系域，对应层序为Ⅰ型层序；在不完整旋回中形成了湖泊充填、湖泊扩张、湖泛三个体系域，或者湖泊扩张、湖泛、湖泊萎缩三个体系域，对应层序为Ⅱ型层序。以松辽盆地西部斜坡实际工作为例，提出了中生代层序及体系域划分方案，较前人研究有新认识。
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| 关 键 词： | 松辽盆地 层序地层 新认识 |
geochemistry of the Permian sedimentary rocks in the Lower Yangtze area |
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| Du Xiaodi,Huang Zhicheng,Chen Zhin,Liu Jiarun.geochemistry of the Permian sedimentary rocks in the Lower Yangtze area[J].Sedimentary Geology and Tethyan Geology,1998,18(1):61-67. |
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| Authors: | Du Xiaodi Huang Zhicheng Chen Zhin Liu Jiarun |
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| Institution: | Du Xiaodi Exploration Bureau,China National Oil and Gas Corporation Huang Zhicheng Chen Zhina Liu Jiarun Department of Earth Sciences,Nanjing University |
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| 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. |
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| Keywords: | Lower Yangtze area Permian sedimentary rock genesis geochemical information |
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