As magma rises under the mid-ocean ridge, ferromagnetic minerals in the magma become magnetized in the direction of the magma become magnetized in the direction of the geomagnetic field.
当岩浆从中海脊下涌起的时候，岩浆中的磁铁矿物质按地磁场的方向被磁化。
The anisotropy of rock magnetic susceptibility, caused by the oriented arrangement of magnetic minerals effected by then magnetic field, reflects the feature of the rock magnetic fabric.
由于磁性矿物受当时磁场作用往往呈定向排列，导致岩石磁化率各向异性，反映了岩石的磁组构特征。
If is weak magnetic minerals, you need to use a strong magnetic field separators, so that it can effectively recovering iron content, but recycling in ore grade is not high.
如果是弱磁矿物，就需要用强磁场磁选机，这样才能够有效的回收铁矿物，但是回收的铁矿中品位不高。
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