澜沧老厂氧化矿与硫化矿元素特征分析

Elements Characteristics of the Oxidized ore and Sulphide in Lancang Laochang,Yunnan

详细阐述了老厂氧化矿与硫化矿元素特征,利用R型因子分析与R型聚类分析,初步探讨其地质作用过程和地球化学行为.研究通过因子分析结果显示,成矿元素Ag、Zn、Pb、Cu与基性火山岩的关系非常密切,而W、Mo、Bi与后期花岗岩侵入有关.反映澜沧地区的石炭纪火山岩是Ag、Pb、Zn等多金属矿田重要矿源层.从R型聚类分析与R型因子分析结果表明:两种分析结果基本是一致的,证明其物源的同一性;主要元素组合有①Cu、Ag、Zn;②Au、Sb、Hg;③Sn、Cr、Ni、Co;④W、Mo、Bi;⑤Ti、Mn等,说明本区成矿作用与火山活动、花岗岩侵入等密切相关;有些元素在不同的因子中重复出现,如Sn、Co、Cr、W、Be、Bi等,表明成矿作用具有多阶段叠加成矿的特点.

This paper presents the detailed characteristics of oxidized ore and sulphide ore elements in Laochang. By the R-Factor and R-Type cluster analysis,we study geological process and geochemical behavior. These data show that the ore-forming elements such as Ag,Zn,Pb,Cu have close relation with the basic volcanic rock,and W,Mo,Bi are relate to the late granite intrusion,which indicate Carboniferous Volcanic Rocks in Lancang are most important source bed of Ag,Pb,Zn polymetallic orefield. The results of R-Factor and R-Type cluster Analysis showed that material sources have identity based on the consistent results of two basic analysis. The main element association including：①Cu,Ag,Zn;②Au,Sb,Hg;③Sn,Cr,Ni,Co;④W,Mo,Bi;⑤Ti,Mn,etc.. These mirror mineralization of local deposit and volcanism,granite intrusion are related. Some elements such as Sn,Co,Cr,W, Be,Bi,etc. appeare in two factor analysis,indicating that the mineralization has the characteristics of multistage superimposed mineralization.