摘要
我国西天山吐拉苏—也里莫墩早石炭世火山岩带是伊犁裂谷的北展部分,其中赋存有阿希大型金矿。火山岩带内除局部地区见底部沉积砾岩外,主体为陆相中酸性火山熔岩、火山碎屑岩以及石英角闪安山玢岩(潜火山岩),火山岩属钙碱性—碱性系列岩石组合。火山活动受近EW向(一级)和近SN向(二级)火山构造控制,并保留了火山机构(三级)。形成的古构造环境为陆缘拉张带。火山岩带活动时限较短,只限于早石炭世早期。
The C_1 volcanic belt holding the large-scale Axi gold deposit in the west Tianshan mountains is the northern part of the Yili rift. The main component of the volcanic belt consists of continental intermediate-acid volcanic lava, volcanic clastic rocks and quartz-amphible andesitic porphyrite (subvolcanic rock), with sedimentary conglomerates locally seen at the bottom of the volcanic belt. The volcanic activity of the belt is controlled by the nearly-EW trend (the first-grade structure) and the nearly-NS trend (the second-grade structure) volcanic structures, and moreover the volcanic apparatus (the third-grade structure) locally remains. The volcanic belt was formed in an epicontinental extension circumstance during a short span from C_1~1 to C_1~2.
出处
《地质论评》
CAS
CSCD
北大核心
1999年第S1期1078-1087,共10页
Geological Review
基金
国家科技攻关305项目(编号96-915-03-06)专题资助
关键词
早石炭世
火山岩带
西天山
吐拉苏
也里莫墩
Early Carboniferous
volcanic belt
west Tianshan
Tulasu
Yielimodun
