【摘要】 通过对四川木落寨稀土矿床及与成矿有关的花岗岩的岩石特征、岩石化学以及稀土元素地球化学研究表明,与成矿有关的岩石是英碱正长岩,而不是前人认为的黑云母花岗岩。岩石 Pb-Sr-Nd 同位素研究说明矿区英碱正长岩及矿石具深源、甚至幔源特征,不同于通常具壳源特征的黑云母花岗岩。木落寨矿床与邻近的冕宁牦牛坪大型稀土矿床的成矿岩石相同,都为英碱正长岩,它们的矿床特征也相似。木落寨英碱正长岩的厘定对研究区域岩浆活动、寻找同类型的稀土金属矿产有重要意义。更多还原

【Abstract】 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.更多还原