barren rock
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区内沉积岩和花岗岩磁性微弱或无磁性，与硼矿密切相关的矽卡岩及硼矿石中磁铁矿含量较高。
The sedimentary rocks and granite in the region are of very weak or no magnetism, while the boron ore and skarn with close relation to boron mineralization are of quite high content of magnetite.
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