摘要
永平铜矿床产于中石碳统叶家湾组地层中,矿体的直接围岩是矽卡岩,矿化与矽卡岩化密切相关。本文着重讨论了矽卡岩的形成机理,研究表明、矽卡岩属层控式矽卡岩,是混合岩化热液所提供的富含SiO_2的高温流体与围岩选择性交代的产物。本区矽卡岩的形成具备三个条件: 1)混合岩化热液提供的富含SiO_2的高温流体。 2)适宜的围岩岩性-灰岩 3)必要的隔挡层-页岩。
Yong ping copper deposit occurs in yeiJiawan group, The major country rock of ore body is Skarn, mineralization is Closely Correlated with the Skarn. This paper majorly discusses the genesis of the skarn. The studies show that the skarn is 'stratified skarn' . Skarn is the product of both the hydrothermal fluid which provided by migmatization and endowed with SiO2,and of the selective replacement of Country rock. The formation of the skarn has three condions:
a) The high hydrothermal fluid which provided by migmatization and endowed with SiO2;
b) appropriate lithological characters of the country rock -lime stone;
c) necessary protective-shale.
关键词
层控
矽卡岩
选择性交代
高温流体
Stratified skarn, selective replacement, Hydrothermal fluid
