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CORRELATIVE RHYTHMS OF “OPENING” AND “CLOSING” AND PALAEOMAGNETIC VARIATIONS IN THE EVOLUTION OF THE EARTH

Yang Weiran\ \ \ Liu Yuyan\ \ \ Deng Qinglu(China University of Geosciences, Wuhan, 430074)  
The rhythm of the Earth′s history is prominently shown by the regular combination of “opening” and “closing”. The rhythm of “opening” and “closing” is established basically on the comprehensive analyses of the various information such as geology, geochemistry, geophysics, biology etc. In this paper, the authors synthesize all kinds of materials and draw up the schematic evolution diagram to illustrate the cycles of “opening” and “closing” on a global scale. The intensity of palaeomagnetic field, the proportion and frequency of palaeomagnetic polarity reversal, and the rate of true polar wandering may display the periodic changes in the geological history and are closely related to the “opening” and “closing”, and may be restricted to the global factors. Therefore, applying the viewpoint of “opening” and “closing” to the palaeomagnetic study, we can reveal the essence of palaeomagnetic phenomena. So the palaeomagnetic study will contribute to determine the environments of “opening” and “closing” and to recover the history of them as well as to probe into the mechanism of them.
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