The difference is not significant. From north to south, the L/M and L/H in Taiyuan formation coal gradually decreased, indicating that the differentiation between LREY and MREY, and the differentiation between LREY and HREY also gradually decreased. M/H in coal shows an increasing trend, indicating that the differentiation between medium rare earth and heavy rare earth is gradually increasing.
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Mineralogy and Geochemistry of Rare Earth Elements in Carboniferous-Permian Coals at the Eastern Margin of the Ordos Basin.
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