幕阜山南缘地区伟晶岩矿物学、地球化学特征及含矿性分析

发布时间：2018-12-10 08:49

【摘要】：为研究幕阜山南缘地区伟晶岩的含矿性并指导幕阜山地区稀有金属找矿工作,采用矿物学、XRF法分析了伟晶岩的矿物特征、主量元素及稀有元素。结果显示,由北往南伟晶岩依次划分为5种类型(Ⅰ~Ⅴ),其SiO_2(71.27%~76.93%)和Na2O(0.68%~7.99%)含量逐次升高,而K_2O含量(10.62%~0.74%)及K_2O/Na_2O值(13~0.09)、Nb/Ta值(4.7~0.2)和K/Rb值(139.02~25.42)则逐次降低。矿物学特征及地球化学分析表明,钾长石伟晶岩(Ⅰ类)和斜长石伟晶岩(Ⅱ类)矿化以磷钇石和独居石为主,斜长石-钠长石伟晶岩(Ⅲ类)、钠长石伟晶岩(Ⅳ类)和钠长石-锂辉石伟晶岩(Ⅴ类)矿化以绿柱石、铌钽铁矿及锂辉石为主,钠长石化和锂辉石化过程制约着稀有金属成矿作用,是极好的找矿标志。
[Abstract]:In order to study the ore-bearing property of pegmatite in the southern margin of Mufu Mountain and to guide the prospecting of rare metals in Mufu Mountain, the mineral characteristics, principal elements and rare elements of pegmatite were analyzed by mineralogy and XRF method. The results show that there are 5 types (鈪，

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