地学前缘 ›› 2009, Vol. 16 ›› Issue (2): 52-69.

• 论文 • 上一篇    下一篇

试论峨眉山玄武岩的地球动力学含义

刘成英 朱日祥   

  1. 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，北京 100029
  • 收稿日期:2008-05-21 修回日期:2008-11-26 出版日期:2009-03-02 发布日期:2009-03-02
  • 通信作者: 朱日祥，男,研究员，中国科学院院士。E-mail: rxzhu@mail.igcas.ac.cn
  • 作者简介:刘成英(1984—)，女，硕士研究生，固体地球物理学专业。
  • 基金资助:

    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)

Discussion on geodynamic significance of the Emeishan basalts

  1. State Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2008-05-21 Revised:2008-11-26 Online:2009-03-02 Published:2009-03-02

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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260 Ma，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

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 understanding of  the relationships among Emeishan mantle plume activity, the endGuadalupian mass extinction and the genesis of the Kiaman reverse superchron (KRS) Important progresses on these topics are reviewed in this paper Besides, on the basis of new paleomagnetic work, the relationships between the Emeishan basalts and the endGuadulupian mass extinction were discussed, as well as their geodynamic significance  

Key words: Emeishan basalts; mantle plume; effusion age and duration; mass extinction；paleomagnetism

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