With the decreasing influence of seawater and the enhanced influenc of continental origin to swamps , the content s of REE in coal increase ,and the REE dist ribution patterns change regularly.
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- 煤的稀土元素分布模式也作有规律的变化,从类似于海相生物的分布模式到类似于陆源碎屑岩的分布模式。