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宝鸡古土壤层S7和黄土层L8的天然剩磁锁定深度初探

, PP. 972-982

Keywords: 古土壤,黄土,地磁极性转换,地磁漂移,天然剩磁锁定

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Abstract:

详细的古地磁及岩石磁学研究表明磁铁矿和赤铁矿是宝鸡古土壤层S7和黄土层L8的特征剩磁的主要载磁矿物,在稳定的正反极性期间,这两种磁性矿物携带的剩磁方向完全一致。然而,在地磁漂移事件或者松山-布容(M-B)极性转换的过程中,这两种载磁矿物有时携带的剩磁方向不同。高分辨率的磁性地层结果证实宝鸡古土壤层S7和黄土层L8能记录300500年的短期地球磁场极性倒转事件。经与日本大阪湾高分辨率的海洋沉积物中记录的同期短期极性倒转事件相比,估算宝鸡剖面土壤层S7和黄土层L8的天然剩磁锁定深度小于58cm。

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