布容-松山极性倒转事件的海陆地质记录及其不同步性探讨

布容-松山（B／M）极性倒转事件是第四纪发生的最近一次地磁极性倒转，研究地磁极性倒转的特征不仅对理解地磁场演化规律具有重要意义，同时极性倒转通常具有全球等时性，因此常被视为地层划分和全球气候对比的关键时间标记物。然而古地磁研究表明，布容-松山事件在海洋与中国黄土沉积物中的记录存在着“错位”现象，使得基于磁性地层年代框架...

Brunhes-Matuyama Polarity Reversal Records and Discussion on Its Recording Phase Lag between Ocean and Terrestrial Sediment

he Brunhes-Matuyama (B/M) reversal is the most recent happened geomagnetic polarity reversal since the Quaternary period. The polarity reversal is considered as occurring synchronously around the world and so is a key time marker which can be used to divide the stratigraphic sequences and correlating climatic proxies between different sediments. It is also very important for understanding the variation in the geomagnetic field. However, the paleomagnetic studies have revealed that the records of B/M reversal in Chinese loess paleosol and the marine sediments are not synchronous, there is an time/climatic “offset” between these two sediments. The “offset” both leads to a challenge for the certainties of correlation between Chinese loess paleosol sequences and the global climate records based on the paleomagnetic time scale. To discuss this “offset” question, this paper intends to review the study history and recent progress on the B/M reversal event in marine and Chinese loess sediments, and toevaluate the possible explanations of this “offset” phenomenon. In addition, the paper also introduces the recent progress of paleogeomagnetic field variation studies traced by cosmogenic nuclide ¹⁰Be in Chinese loess, suggesting the feasibility of combining the ¹⁰Be with paleomagnetic analysis to trace the exact position of B/M event recorded in Chinese loess.