地球磁极倒转的星地碰撞成因

刘广润; 张宏泰

地球磁极倒转的星地碰撞成因

刘广润¹,
张宏泰²

1.
华中科技大学水电学院, 湖北武汉 430074
2.
湖北省地质调查院, 湖北武汉 430030

详细信息

作者简介:
刘广润(1929-)，男，教授，中国工程院院士，主要从事工程地质和环境地质研究

中图分类号: P318
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- 被引次数: 0
出版历程
- 收稿日期: 2004-11-23
- 刊出日期: 2005-05-25

Cause of Geomagnetic Polarity Reversal: A View of Collision Dynamics of a Celestial Body with Earth

LIU Guang-run¹,
ZHANG Hong-tai²

1.
Hydroelectric Department, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Hubei Institute of Geological Survey, Wuhan 430030, China

摘要

摘要: 地球磁场多次发生南北(正负)磁极位置的变换, 即极性倒转, 这已为大家所公认; 但造成这种极性倒转的原因, 则是迄今未能很好解答的一个难题.基于地球磁场的发电机效应理论和星地碰撞的动力效应研究, 探讨了外星撞击地球造成地磁场极性倒转的可能性.研究表明, 当外星沿与地球自转的正逆不同方向撞击地球时引起的地球转速快慢变化, 可导致地球内部核、幔圈层之间的转速相对快慢关系(相对运动方向)发生改变, 从而受其控制的液核涡旋方向及相应的地磁场方向也会随之改变, 于是就形成地磁极性倒转.这是一个新的思路, 它给地磁极性倒转提出了一个简明的动力机制解释.
- 地球磁极倒转 /
- 成因 /
- 星地碰撞
Abstract: It is generally acknowledged that geomagnetic polarity has reversed many times in geological history. However, the cause has been unknown up to now. Based on the theory of a generator effect for the formation of the Earth's magnetic field, and the dynamic effect of a collision with a celestial body, the possibility of a geomagnetic polarity reversal caused by the collision of an asteroid with the Earth is considered in this paper. When a celestial body collides with the Earth in a direction positive or negative to the rotation of the Earth, the rotation speed of the Earth could be quickened or slowed. This could change the direction of the relative movement between Earth's core and mantle. Consequently, the direction of the vortex movement in the liquid core and the geomagnetic field may change, therefore realizing geomagnetic polarity reversal. This new concept gives a simple and clear explanation for the dynamic cause of geomagnetic polarity reversal.
- geomagnetic polarity reversal /
- cause of formation /
- collision of a celestial body with the Earth.

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图 1 近4.5 Ma地磁极性年表

Fig. 1. Geomagnetic polarity reversal time scale during 4.5 Ma

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图 2 地磁场的发电机成因模式

Fig. 2. Generator model for geomagnetic field

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图 3 地核中涡旋的排列

Fig. 3. Arrangement of vortexes in Earth core

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图 4 不同方向的星地碰撞引起地球核幔层圈之间相对运动变化

Fig. 4. Sketch map showing the change of the direction of relative movement between Earth core and Earth mantle induced by the collision of a celestial body with the Earth along different directions

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