知识与财富的链接
都龙锡锌超大型矿床是中国第三大锡石硫化物矿床,其中的绿泥石化相当普遍,并与矿化关系密切。本文在岩矿鉴定基础上,利用电子探针对绿泥石进行了微区化学成分研究。研究结果表明,该矿床绿泥石为富铁种属的假鳞绿泥石、鲕绿泥石、蠕绿泥石(铁绿泥石)及铁镁绿泥石,指示形成于还原环境;绿泥石为泥质岩或铁镁质岩受热液交代蚀变的产物,绿泥石结构的离子置换主要体现为Fe对Mg的置换,反映其形成与含铁建造有关;绿泥石的形成温度为231～304℃,平均为269℃,属于中-低温范围。绿泥石的形成机制主要表现为溶蚀-结晶、溶蚀-迁移-沉淀结晶2种。绿泥石可能与锡成矿同期形成,其与矿石矿物的生成关系表明,燕山期岩浆活动对都龙矿床的叠加改造作用显著。
The Dulong superlarge Sn-Zn deposit is the third largest cassiterite sulfide deposit in China. Chlorite is one of the main hy-drothermal alteration minerals genetically related to tin mineralization in this ore deposit. By means of microscopic and electron micro-probe analysis, the user investigated chemical composition and texture of the chlorite and concluded that chlorites in the Dulong Sn-Zn deposit have the following characteristics: ① they are mainly Fe-rich chlorites composed of pseudothuringite, chamosite, prochlorite and brunsvigite, indicating a reducing environment during their user; ②they were produced by hydrothermal alteration of pelitic or mafic rocks, and the phenomenon that Fe-Mg substitution dominates the octahedral substitution suggests that their formation had to do with the iron-rich formation; ③they were formed at temperatures of 231-304℃ (averagely 269 ℃ ) , in the range of low-mod-erate temperature; and ④ both chlorites and cassiterite were formed in the Late Yanshanian magmatic hydrothermal ore-forming user that occurred under the low-moderate temperature reducing condition.
