Abstract
Based on REE abundances in megacrysts and host basalts and their equilibrium conditions, it has proved that megacrysts may have been produced from the magma derived from the host rocks or of more basic composition. The REE ratios of megacrysts to host rocks may be taken as partition coefficients when both are in equilibrium with each other. The crystal fractionation of megacrysts has caused the evolution of REE in the magma. It is obvious that some host basalts are the product of magma evolution after crystal fractionation. According to REE abundances in the host rocks and the partition coefficients between crystal and liquid, the history of crystal fractionation of magma can be traced.
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