摘要
四川呷村富银多金属矿床是一个晚三叠世形成的块状硫化物(VMS)矿床,后又经历了绿片岩相条件下的区域变质变形作用改造。野外研究和室内组构观察表明,该矿床出露的似层状矿化体形状是区域构造"重构"的结果;不同硫化物的不同变形习性,构成了脆性—塑性变形组构共存的复杂样式,矿石的条纹和条带状构造主要是"软"硫化物矿物塑性变形引起的机械再活化作用的结果。各矿化体目前的产状和空间关系主要受后期构造变形控制,矿化体的初始空间展布需要甄别和恢复。
Gacun polymetallic deposit, a typical VMS deposit, was subjected to greenschist facies regional metamorphism and related deformation after Indo-Chinese epoch. The results of detailed field and microscopic studies on the deposit show that the stratiform orebodies underwent extensive structural reformation and that the distinct deformed behaviours from different sulfides gave rise to the complex style with both brittle and plastic deformed fabrics. The streaky and banded structures in the ores were resulted from the remobilization of solid-state mechanical transfer in plastic deformation of "soft" sulfides. Because the present occurrences of the bodies are controlled by late-stage structural activities, they can't directly represent the original locations and occurrences of orebodies in the VMS deposits.
出处
《地质科技情报》
CAS
CSCD
北大核心
2008年第6期79-84,共6页
Geological Science and Technology Information
基金
国家自然科学基金项目(40572055)
关键词
VMS矿床
变质组构
硫化物
脆性和塑性变形
呷村
VMS deposit
metamorphic microstructure
sulfide
brittle and plastic deformation
Gacun