滇西宝兴厂喜山期复式岩体锆石标型特征及成因意义

摘要

This paper applied Pupin’s zircon method of zircon typomorphic research on the verification and statistics of zircon in Himalayan complex massif from Baoxingchang of Western Yunnan.The results indica-ted that there were 1 8 sub-types of zircon in the complex massif within the area.The zircon was composed of the cylinder{100}and{110}and the cone{111}and{311},among which cylinder{100}was excellently developed and cone{1 1 1}was developed to the greatest extent.It is well known that factors like temperature,acidity, alkalinity are vital to the development of crystalline forms.As to the zircon in this study,it is crystalized with fast speed under the circumstance of meta-alkalescence and low temperature.According to the typomor-phic characteristics of the zircon crystallization,the complex massif in this area is crust-source granite with crust and mantle mixed as its genesis and is characterized by rich water,rich alkali and rich metallogenic ma-terials.The complex massif becomes magmatic system which is in favor of mineralization.%文章运用Pupin的锆石群型研究方法，对滇西宝兴厂喜马拉雅期复式岩体中锆石的鉴定和统计，研究表明，本区复式岩体中的锆石有18种亚型，主要由{100}、{110}柱面和{111}、{311}锥面组成，其中柱面以{100}特优发育，锥面以{111}最为发育；众所周知，温度、酸性、碱性程度等对晶形的发育影响很大，本次研究锆石结晶速度较快，结晶温度较低，且在偏碱性的环境下形成的。锆石的结晶标型显示本区复式岩体是以壳源为主的壳幔混合成因的花岗岩，具有富水、富碱、富含成矿物质的特征，成为有利成矿的岩浆系统。