碱性障
- 网络alkaline barrier
碱性障-
风化壳底部狭窄的碱性障是稀土超常富集的主要制约因素。
At the bottom of the profile the alkali barrier is the predominant factor that results the enrichment of REE .
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碳酸盐岩的酸不溶物含量低，碳酸盐矿物可溶性强，发育程度较高的风化壳剖面能够在垂向上很窄的范围内形成碱性障。
The carbonate is easily soluble and the concentration of insoluble residues is very small , so the alkali barrier can form in the vertical profile with higher weathering degree .