geochemical activity
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由于稀土元素在各种地质作用中具有一定的活动性，正确考虑稀土元素的地球化学活动性是运用稀土元素解释地质问题的基础。
REE is very useful in interpreting some geological problems. However as the fact of the mobility of REE during some geological processes, it is necessary to evaluate the REE mobility degree.
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