极性亚代
The main results are as follows: 1.The Blake polarity subchron is located in the middle-low part of S1, and the time duration of this polarity subchron defined by direction and intensity changes of the Earth's magnetic field are about 3900 and 5000 years respectively.
主要结果为:1.Blake亚时位于S1的中下部;与地球磁场方向和强度变化相联系的持续时间分别为3900a和5000a。
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