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Geochemistry characteristics of rare earth elements in the late Paleozoic coal from Qinshui Basin

LIU Bei;HUANG Wen-hui;AO Wei-hua;YAN De-yu;XU Qi-lu;TENG Juan;School of Energy Resources,China University of Geosciences( Beijing);Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Geosciences( Beijing);Key Laboratory of Unconventional Gas Geological Evaluation and Development of Beijing;School of Materials Science and Technology,China University of Geosciences( Beijing);  
The geochemistry characteristics of REY in the late Paleozoic coal,roof and floor rocks including carbon mudstone,siltstone,limestone and veined pyrite from the Qinshui Basin were analyzed using inductively coupled plasma mass spectrometry,X-ray fluorescence spectrometry and X-ray diffraction.The occurrence modes of REY and their geological origin were discussed based on geochemical parameters of REY.The results show that the content of REY in coal from the Qinshui Basin is lower than the average content of REY in Chinese coals.The content of REY in the coal of the Taiyuan Formation is higher than that of the Shanxi Formation.The horizontal distribution of REY shows that the content of REY in southern part of the Qinshui Basin is higher than that in the northern part of the Qinshui Basin.REY in coal mainly occurs in clay minerals,and veined pyrite is rich in REY. The contents of REY in carbonate minerals and oxides are relatively low.Furthermore,quite a part of REY in coal occurs in organic matter.Correlation analysis indicates that REY is highly and positively correlated with Si and Al.It is suggested that the enrichment of REY in coalfrom the Qinshui Basin is controlled by coal-forming environment and the source of REY in coal,roof and floor rocks are consistent.The common intrusion of sea water on the peat bog leads to higher heavy REY in the coal of the Taiyuan Formation,but it does not result in negative anomaly of Ce.
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