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采用INAA测试了淮南矿区 13个煤层煤样的稀土元素含量 ,研究了稀土元素地球化学特征 ,得出以下认识 :各煤层样品的稀土元素含量、分布模式变化都很大。煤中稀土元素主要来源于陆源碎屑 ,来源于海水和植物的不多 ;稀土元素在粘土矿物中含量高 ,主要以高岭石的形式赋存。稀土元素具有指相意义 ,随着成煤沼泽中海水影响的减弱 ,陆源影响的增强 ,煤中稀土元素的含量增加 ;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。Eu异常是由源岩继承下来的 ,Eu负异常的减弱 ,估计是由于陆源控制减弱、海水影响增强引起的。在成煤沼泽环境中 ,海水的影响并未造成Ce严重亏损。
The INAA was used to test the REE content of 13 coal seam samples in Huainan mining area. The geochemical characteristics of rare earth elements were studied. The following conclusions were obtained: the REE content and distribution pattern of each coal seam sample vary greatly. Rare earth elements in coal mainly come from terrestrial debris, which is not much from seawater and plants. The content of rare earth elements in clay minerals is high, mainly in the form of kaolinite. Rare earth elements have the meaning of the phase, with the impact of sea water in the coal marsh weakened, the impact of terrestrial sources increased, the content of rare earth elements in coal increased; coal rare earth elements distribution patterns also make regular changes from similar to marine life The distribution pattern is similar to that of terrigenous clastic rocks. The Eu anomaly is inherited by the source rock and the Eu anomaly is weakened, which is estimated to be due to the weakened terrigenous control and the enhanced influence of seawater. The impact of seawater did not cause a serious loss of Ce in coal-formed marshes.