胶北乳山金矿含金石英脉中稀土矿物的发现及其意义

通过显微分析和电子探针测试，对乳山金矿石英脉中首次发现的稀土矿物独居石等进行了系统研究，发现石英脉中独居与钾花花岗岩围岩中的独居石既有相似性， 又有一定差异，前LREE更为富集，说明在成矿流体演化过程中LREE得到进一步集中。与不同地区、不同成因独居石的化学成分和稀土元素配分模式的对比分析表明，乳山金矿石英脉中独居石LREE最高，尤其以La最为显。对含金石英脉、钾化花岗岩、煌斑岩和变质岩的稀土元素分析发现， 前两关系密切，与煌斑岩也有一定联系，但与变质岩关系不大。在统一的深部构造背景下，通过花岗岩钾化蚀变作用形成了含金成矿流体，并在合适构造中沉淀成矿。

Rare-earth Minerals in the Gold-bearing Quartz Vein in the Rushan Gold Deposit in East China and Their Significances

Monazite in the gold_bearing quartz veins in the Rushan gold deposit, East China, is systematically analyzed by EPMA and other methods. The data show that the monazite in the quartz veins is different from that in relevant granites. The former is rich in LREE, with LR/HR and La/Yb ratios twice as much as that of the latter.It is suggested that LREE concentrated during the evolution of the ore_forming fluid. Comparing the chemical compositions and chondrite_normalized REE patterns of monazite of different kinds from different areas, we conclude that LREE in the monazite in the gold quartz veins is of the highest concentrations especially La. In combination with REE analysis of gold veins and different rocks from the deposit, we believe that LREE_rich ore_forming hydrothermal solution was likely connected with deep process caused by enriched mantle.