地学前缘 ›› 2020, Vol. 27 ›› Issue (1): 211-220.DOI: 10.13745/j.esf.2020.1.23

• 非主题来稿选登 • 上一篇    下一篇

印度大陆板块北漂的动力机制研究

梁光河   

  1. 1. 中国科学院 地质与地球物理研究所; 中国科学院矿产资源研究重点实验室, 北京 100029
    2. 中国科学院 地球科学研究院, 北京 100029
    3. 中国科学院大学, 北京 100049
  • 收稿日期:2019-03-20 修回日期:2019-09-05 出版日期:2020-01-20 发布日期:2020-01-20
  • 作者简介:梁光河(1965—),男,副研究员,地球物理学专业,主要从事矿产资源勘查、大地构造和地震成因机制研究。E-mail: lgh@mail.iggcas.ac.cn
  • 基金资助:

    第二次青藏高原综合科学考察研究(2019QZKK0806); 国家重点研究计划“深地资源勘查开采”重点专项项目“北方增生造山成矿系统的深部结构与成矿过程”(2017YFC0601204)

Study on the dynamic mechanism of northward drift of the Indian Plate.

LIANG Guanghe   

  1. 1. Institute of Geology and Geophysics, Chinese Academy of Sciences; Key Laboratory of Mineral Resources Research, Chinese Academy of Sciences, Beijing 100029, China
    2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-03-20 Revised:2019-09-05 Online:2020-01-20 Published:2020-01-20

摘要:

印度大陆板块是一个活化的克拉通板块,其向北漂移并与欧亚板块碰撞过程得到了广泛研究,但其北漂的动力机制则很少被关注。传统上认为是海底扩张造成了印度大陆板块的北漂,但最新的地球物理观测结果却与此相悖。基于地磁场异常特征、古地磁测量和地震勘探剖面等诸多证据的系统分析研究,结果表明印度大陆板块厚度大约40 km,其北漂的动力机制与印度板块南侧深部的岩浆上涌密切相关,大陆板块的漂移是自发驱动的。通过新建立的大陆漂移模型可以合理解释印度大陆板块漂移的动力来源,并合理地解释了印度大陆板块北漂中伴随左旋的深层次动力机制。最后探讨了印度大陆板块在80~40 Ma期间异常高速漂移的根源和东非大裂谷的成因。本研究为大陆漂移模式提供了一个新的动力机制。

关键词: 印度大陆板块, 大陆漂移, 动力机制, 东非裂谷, 海底扩张

Abstract:

The Indian continental plate is an activated cratonic plate. Its northward drift and collision with Eurasian plate have been extensively studied, however, the dynamic mechanism of the northward drift is rarely noticed. Traditionally, it is believed that the seafloor spreading caused the northward drift of the Indian Plate, but the latest geophysical observations are contrary to this belief. Based on systematic analyses of geomagnetic anomaly characteristics, paleomagnetic measurements and seismic exploration profiles, we showed that the thickness of the Indian continental plate is about 40 km. We established a new continental drift model to illustrate that the dynamic mechanism of the northward drift is closely related to the continuous deep magma upwelling in the south part of the Indian Plate, such that the northward drift is self driven. This model can reasonably explain the power source of the Indian Plate drift; and it can also give a reasonable explanation about the dynamic mechanism of the leftlateral rotation of the Indian Plate. Finally, we discussed the origin of the abnormal highspeed drift of the Indian Plate between 8040 Ma and the cause of the Great Rift Valley in East Africa. This study provides a new dynamic mechanism for the continental drift model.

Key words: Indian continental plate, continental drift, dynamic mechanism, East African rift, seafloor spreading

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