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东亚地磁场长期变特征及年代学意义
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摘要
<正>地磁场长期变源自地球液态外核流动方式的改变,受偶极子和非偶极子场控制。400年前,人们开始系统记录和观测地磁场的变化。实际观测的地磁场变化数据是了解地球内部活动的重要材料[1-5]。更为久远的地磁场变化,如全新世地磁场长期变则需要通过地磁记录载体来获得,研究材料包括火山岩[6]、考古材料(如壁炉、砖等)[7-10]以及高沉积速率的湖相[11-17]和海相沉积物[18,19]等。其中,湖泊和海洋沉积物可以提供连续高分辨率的地磁场变化信息,成为全新世地磁场长期变研究中
引文
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