内蒙古敖仑花斑岩钼矿床脉状岩枝的岩相学特征及地质意义  

Petrographical characteristics and geological significance of vein dike in the Aolunhua porphyry Mo deposit,Inner Mongolia

作　　者：邹滔[1] 王玉往[1] 王京彬[1] 张会琼[1] 赵路通[1] 石煜[1] 

机构地区：[1]北京矿产地质研究院,北京100012

出　　处：《矿产勘查》2016年第1期93-100,共8页Mineral Exploration

基　　金：中国地质调查局老矿山项目(编号:12120113086300)资助

摘　　要：脉状岩枝与单向固结结构(UST)一样,是一种特殊的岩浆—热液过渡结构,其内的原生包裹体可能记录了初始流体出溶的信息。文章在内蒙古敖仑花斑岩钼矿中首次发现了脉状岩枝的存在。岩相学特征显示,脉状岩枝可分为3类:(1)富流体脉状岩枝,(2)富岩浆脉状岩枝,(3)细晶岩脉。脉状岩枝的特征表明,初始流体可能是岩浆分异后残余硅酸盐熔体和流体共存的岩浆—热液过渡性流体,其独特的结构特征反映成矿流体是深部岩浆房流体出溶的产物,并可能在敖仑花岩体的深部存在一个大型的岩基。The vein dike is a special magmatic-hydrothermal transition texture as unidirectional solidification texture （UST）.The primary fluid inclusion in the vein dike may record information of initial fluid exsolution.This study first finds the vein dike in the Aol- unhua Mo deposit. The petrographical characteristics of vein dike show that the vein dike can be classified into three type as followings ： （1） fluid-rich vein dike; （2） magma-rich vein dike; （3） aplite vein. The different vein dikes show the initial fluid may be a magmatic-hydrothermal transition fluid that is residual silicate melt and fluid after magmatic differentiation. This unique texture reflects the fluid is a product of exsolving in deep-seated magma chamber. These imply the existence of a relatively large magma chamber below the Aolunhua deposit.

关 键 词：脉状岩枝 流体出溶 敖仑花斑岩型钼矿 内蒙古 

分 类 号：P618.65[天文地球—矿床学]