Geochemistry of Rare － Earth Elements of Coal in Huainan Mining Area

ZHAO Zhi gen; TANG Xiu yi; LI Bao fang

An INAA (Instrumental Neutron Activation Analysis)method is used to determine the contents of rare-earth elements of 13 coal samples in Huainan Mining Area, and the geochemistry of REE is discussed.Some conclusions are drawn as follows:The REE contents and REE distribution patterns vary significantly among different coal samples.The REE in coals is mainly continental origin,while seawater origin and plant origin are few.The REE in coals is concentrated in clay minerals,and the main occurrence is in kaolinite.The characteristics of REE have significance to indicate sedimentary environments.With the decreasing influence of seawater and the enhanced influenc of continental origin to swamps,the contents of REE in coal increase,and the REE distribution patterns change regularly.Eu anomaly is inherited by the source rock.The decrease of negative Eu anomaly is probably caused by the weakenss of continental origin and the enhancement of seawater's influence.In peat swamp environment,no effective influence is found to lose Ce by the invasion of seawater.

1 Huainan Institute of Technology,Huainan Anhui 232001;

2 China University of Geosciences,Beijing 100083

Received Date: 1998-04-07

Rev Recd Date: 2000-03-27

Publish Date: 2000-09-10

Key words:

Abstract: An INAA (Instrumental Neutron Activation Analysis)method is used to determine the contents of rare-earth elements of 13 coal samples in Huainan Mining Area, and the geochemistry of REE is discussed.Some conclusions are drawn as follows:The REE contents and REE distribution patterns vary significantly among different coal samples.The REE in coals is mainly continental origin,while seawater origin and plant origin are few.The REE in coals is concentrated in clay minerals,and the main occurrence is in kaolinite.The characteristics of REE have significance to indicate sedimentary environments.With the decreasing influence of seawater and the enhanced influenc of continental origin to swamps,the contents of REE in coal increase,and the REE distribution patterns change regularly.Eu anomaly is inherited by the source rock.The decrease of negative Eu anomaly is probably caused by the weakenss of continental origin and the enhancement of seawater's influence.In peat swamp environment,no effective influence is found to lose Ce by the invasion of seawater.

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Geochemistry of Rare － Earth Elements of Coal in Huainan Mining Area

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