A discussion on the mineralization-related granite in the Muluozhai REE ore deposit,Sichuan Province and its significance

Based on studies of petrology,petrochemistry and REE geochemistry of the Muluozhai REE ore de- posit in Sichuan and the granite related to REE mineralization,it is known that the granite is nordmarkite in- stead of previously-considered biotite granite.From the study of Pb-Sr-Nd isotopic geochemistry,it is shown that the nordmarkite and ores in this area are characterized by deep source or even mantle source rocks.Obvious- ly,the granite is different from the biotite granite which is generally regarded as a rock with crust source.Ig- neous rock related to mineralization of the Muluozhai ore deposit in Mianning County is similar to that of the Maoniuping ore deposit,a large-size REE ore deposit in the same county.They are both nordmarkite and have similar metallogenic features.The confirmation of the Muluozhai nordmarkite is of great significance in under- standing regional magmatism and searching for REE mineral resources of the same kind.