【摘要】 位于桂西北丹池成矿带上的大厂锡多金属矿床是世界重要的铟产地,其铟元素主要赋存在闪锌矿中,而闪锌矿往往与黄铜矿及磁黄铁矿共生。以闪锌矿为对象,在野外、室内矿物学观察基础上,通过高精度电子探针和微量元素分析为手段,研究闪锌矿微量元素之间相互关系及其形成原因。根据实验结果,得出以下结论:铜坑矿床中的闪锌矿富含大量的微量元素,闪锌矿独特的四面体结构以及较高的Fe含量有利于微量元素的进入,微量元素的相关性不仅反映了元素含量的此消彼长,更反映了成矿时不同的物理化学条件。通过对微量元素相关性及闪锌矿"骨骼"现象的研究,推测闪锌矿丰富的微量元素及"骨骼"现象并非闪锌矿同期产物,而是与岩浆有关的晚期富Cu、Sn、In流体叠加交代早阶段含Cd闪锌矿的结果。一方面,大量的微量元素进入到闪锌矿晶格中;另一方面,岩浆带来的大量Cu元素捕获原有闪锌矿,原有闪锌矿在黄铜矿中重结晶形成雪花状和星状等"骨骼"现象。更多还原

【Abstract】 The Dachang tin-pollymetallic deposit,which located in Danchi metallogenic belt of northwest Guangxi,is an important original place of indium. The element of In is hosted in sphalerite mostly,while the sphalerite,chalcopyrite and pyrrhotite intergrow with each other regularly. The study on correlation between different elements and forming cause of sphalerite has been taken by mineralogical observation,elements analysis test and electron microprobe analysis test. According to the tests,some conclusions have been obtained,there are a large number of trace elements in sphalerite in Tongkeng deposit; The trace elements get into the sphalerite because of its individual tetrahedral structure and large amount of the element of Fe. the correlation of trace elements not only show different changes of element content but also show different physical and chemical ore-forming conditions. According to the study on the correlation of elements and skeletal crystals of sphalerite,it can be inferred that a large amount of trace elements and skeletal crystals of sphalerite are results of the Cu-rich,Sn-rich and In-rich fluid superpose on early Cd contained sphalerite instead of forming with sphalerite in the same time. On one hand,a large amout of trace elements get into the lattice of spalerite; On the other hand,there are snowflake shape and star shape of skeletal crystals of sphalerite when sphalerite recrystal in chalcopyrite,for sphalerite is trapped by element of Cu,which brought by magma.更多还原