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西藏乌郁盆地中新世火山岩的地磁极性转换记录

, PP. 1571-1581

Keywords: 青藏高原,中新世,火山岩,古地磁,地磁场倒转

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Abstract:

?地磁极性倒转过程是研究地磁场演化和地球深部动力学的重要内容.拉萨地块南部广泛出露的中新世后碰撞超钾质-钾质火山岩序列,为研究该时期地磁场倒转过程提供了良好的材料.对南木林县乌郁盆地15Ma左右乌郁群地层的古地磁研究表明,火山岩记录了C5Bn.2n-C5Bn.1r和C5ACr-C5ACn两次极性转换期地磁场变化.该剖面记录的这两次地磁极性转换期的虚地磁极(VGPs)分别位于大西洋地区和太平洋中南部.结合北美地区斯特恩斯山玄武岩记录的极性转换过程,已获得的中新世地磁转换期数据似乎不支持VGP经度与采样点相差90°或随机分布的观点.

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