| 试论峨眉山玄武岩的地球动力学含义 |
| |
| 引用本文： | 刘成英,朱日祥.试论峨眉山玄武岩的地球动力学含义[J].地学前缘,2009,16(2):52. |
| |
| 作者姓名： | 刘成英 朱日祥 |
| |
| 作者单位： | 中国科学院地质与地球物理研究所岩石圈演化重点实验室; |
| |
| 基金项目： | 国家自然科学基金优秀群体资助项目(40221402);;国家自然科学基金重点项目(40523003) |
| |
| 摘 要： | 峨眉山大陆溢流玄武岩是中国唯一被国际学术界认可的、地幔柱成因的大火成岩省。峨眉山玄武岩的主相喷发时间约为260Ma,与二叠纪晚瓜德鲁普期生物灭绝事件的时间相当。地球动力学模拟结果显示,地幔柱活动不仅与超静磁带的产生和结束有密切联系,而且地幔柱活动可能引发生物大灭绝。文中讨论了前人对峨眉山玄武岩的来源、成因以及喷发与持续时间等重要研究进展,并基于新的古地磁研究结果,探讨了峨眉山玄武岩与Kiaman负极性超静磁带(KRS)和二叠纪晚瓜德鲁普期生物灭绝事件的联系以及相应的地球动力学含义。
|
| 关 键 词： | 峨眉山玄武岩 地幔柱 喷发与持续时间 生物灭绝 古地磁 |
Discussion on geodynamic significance of the Emeishan basalts |
| |
| Liu Chengying,Zhu Rixiang State Key Laboratory of Lithosphere Evolution.Discussion on geodynamic significance of the Emeishan basalts[J].Earth Science Frontiers,2009,16(2):52. |
| |
| Authors: | Liu Chengying Zhu Rixiang State Key Laboratory of Lithosphere Evolution |
| |
| Institution: | Liu Chengying,Zhu Rixiang State Key Laboratory of Lithosphere Evolution,Institute of Geology , Geophysics,Chinese Academy of Sciences,Beijing 100029,China |
| |
| Abstract: | It had been accepted that the Emeishan large igneous province was generated by the mantle plume,yet the plume formation is still hotly debated. Radiometric datings showed that the main phase of the Emeishan basalts is ~260 Ma,corresponding to the end-Guadalupian mass extinction. Recent numerical modeling suggested that the mantle plume activity was closely linked to both superchron and the mass extinction. Therefore,probing into the age and duration of Emeishan basalts is of significance to the understandin... |
| |
| Keywords: | Emeishan basalts mantle plume effusion age and duration mass extinction paleomagnetism |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地学前缘》浏览原始摘要信息 |
| 点击此处可从《地学前缘》下载免费的PDF全文 |
