氟硼酸根电极直接电位法测定岩矿中的微量硼

硼是典型的亲石元素，在地壳中富集。在岩浆活动中，它是挥发性成分，对矿物结晶及成矿元素的运移和富集有重要影响，测定岩矿中硼的含量不仅可作为划分岩石类型的重要依据，也是判断成矿可能性的依据之一。过去由于受硼测试方法的限制，硼的地球化学研究工作受到一定的影响。

钨矿物的稀土地球化学特征——矿床成因类型的判别标志

研究表明,斑岩型钨矿物和石英脉型钨矿物稀土组成是不同的,前者较富轻稀土,后者较富重稀土,它们与各自的含矿母岩稀土特征相类似。因此,稀土模式可以作为判别成岩成矿物质来源和划分矿床成因类型的标志,为找矿和矿床评价提供依据。

砷、磷、硅的低层析分离及微量砷钇矿的系统分析

砷钇矿是一种罕见的稀土砷酸盐矿物。与氟碳钙钇矿,磷钇矿、钍石、铌铁矿等共生。其分子式为Y(AsO_(4))。在系统分析中主要测定TR_(2)O_(3),As_(2)O_(3),SiO_(2),P_(2)O_(8),Fe_(2)O_(3),CaO,MgO,Al_(2)O_(3),V_(2)O_(5),ThO_(2),U_(3)O_(8),MnO等成份。砷钇矿的研究对成矿条件,稀土和砷的地球化学研究都是很有意义的。

REE Geochemical Characteristics of Tungsten Minerals as a Discriminant Indicator of Genetic Types of Ore Deposits

Tungsten minerals (scheelite and wolframite)from two genetic types of granitoids show significant dif-ferences in REE distribution,probably due to different material sources and origins.Tungsten miner-als in granite porphyry of the crust-mantle source are relatively high in ∑REE(1884ppm on average).∑ Ce is rich relative to ∑Y and ∑Ce/∑Y is relatively high(>1).The chondrite-normalized REE distribution patterns are characterized by a group of rightward-inclined curves.Tungsten minerals in quartz veins intruding the granites of crust origin have lower ∑REE (335 ppm on average).∑Y is rich relative to ∑Ce and ∑Ce/∑Y is relatively low(<1).The chondrite-normalized REE distribution patterns are characterized by a group of leftward-inclined curves.So the REE distribution patterns can be used to discriminate the sources of rock-and ore-forming materials and the genetic types of W deposits so as to provide clues to ore prospecting.