四川木落寨稀土矿床与成矿有关的花岗岩问题及其意义  

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

作　　者：田世洪[1,2] 袁忠信[1] 张桂兰[3] 侯增谦[4,5] 丁悌平[1,2] 白鸽[1] 邹天人[1] 谢玉玲[6] 

机构地区：[1]中国地质科学院矿产资源研究所 [2]国土资源部同位素地质重点实验室,北京100037 [3]内蒙古自治区国土资源信息院 [4]国土资源部同位素地质重点实验室 [5]中国地质科学院地质研究所,北京100037 [6]北京科技大学土木与环境工程学院

出　　处：《岩石矿物学杂志》2006年第2期110-118,共9页Acta Petrologica et Mineralogica

基　　金：国家杰出青年基金(40425014)国家重点基础研究发展规划项目(2002CG412610;G1999043211)中国地质科学院重点开放实验室专项资金资助项目(KL05-9)中国地质大学(北京)地质过程与矿产资源国家重点实验室基金(GPMR0548)

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。Based on studies of petrology, petrochemistry and REE geochemistry of the Muluozhai REE ore deposit in Sichuan and the granite related to REE mineralization, it is known that the granite is nordmarkite instead 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. Obviously, the granite is different from the biotite granite which is generally regarded as a rock with crust source. Igneous 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 understanding regional magmatism and searching for REE mineral resources of the same kind.

关 键 词：岩石学 岩石化学 稀土元素地球化学 岩石成因Pb-Sr-Nd同位素 四川木落寨稀土矿床 

分 类 号：P588.121[天文地球—岩石学] P618.7[天文地球—地质学]