云龙锡矿不同颜色锡石的研究

本文对云南省云龙锡矿六种不同颜色的12个锡石样品进行了阴极射线发光、紫外和可见吸收光谱的研究和电子探针分析,证明不同颜色锡石的发光光谱和吸收光谱没有本质上的差别。锡石颜色的变化一方面与杂质元素Fe、W、Nb、Ti的含量有关,主要的还是锡石本身色带结构所决定;锡石颜色深浅变化还与其形成温度和时间有关。     

云龙锡矿独特的矿床地质特征

The Yunlong tin deposit is controlled by a NNW tectonic zone. The primary ore bodios occur mainly in migmatized granites, occasionally in their external contact zones.The extending direction of tin ore bodies is approximately consistent with that of the regional tectonic line. Ore bodies in the three tin ore belts of the studied region fall into three typos: cassiterite-quartz tourmaline veins, cassiterite-quartz veinlets and cassiterite-quartz sulfide veins. The mineral compositions of the ore bodies are rather simple. The principal minerals are quartz, elbaite, schori, dravite, cassiterite,pyrrotite, pyrite and arsenopyrite.Wail-rock alteration is oharaeterized by silicification, tourmalinization, chloritization,etc. Tin ore veins are rich in boron and fluorine as mineralizing elements. The Yunlong deposit is a hypothermul tin deposit associated with migmatization,and ira metallogenetic epoch is Himalayan.     

金红石和锡石的喇曼光谱研究

对我国不同地区和不同成因类型矿床的金红石和锡石及人工合成的金红石样品进行了室温下的喇曼光谱测定。每一粉末样品的喇曼图谱中都见有群论所预言的四条本征喇曼谱带。对于每一谱带的归属进行了说明。对单晶体的喇曼光谱测定说明,不同的入射和接受方向只对谱带的相对强度产生影响。     

云龙锡矿锡石的标型特征

云龙锡石的晶形以双锥集合体、双锥柱状为主,结晶晶形好。锡石的颜色本质上为棕色,由于锡石中棕色条带所占比例的不同而构成了各种颜色。锡石的磁性为亚铁磁性及抗磁性两种。其形成温度以高温为主,至少有三个世代。锡石的晶形、颜色,磁性及成矿温度均与化学成分关系密切,而化学成分及成矿温度又反映了矿床成因的特征。