Parameters of geochemical effect equation for lanthanides and their geochemical significance for a series of metamorphic coals.

In this study, the linear regression coefficients in the relationship of the LREE after normalization with chondrite and the radius of its trivalent ion (hereinafter called “regression coefficients of geochemical effect equation for chondrite-linear lanthanides”) had significant or even highly significant positive correlations with concentration of Al, Si, La, Ce, and Pr (Table 3 , with goodness of fit values of 0.4919, 0.5062, 0.9838, 0.8617, and 0.5559, respectively).

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