新疆东天山康古尔塔格金矿带成矿作用的构造制约  

Tectonic constraints on mineralization of the Kanggurtag gold belt in the Eastern Tianshan,Xinjiang,NW China.

作　　者：王义天[1] 毛景文[1] 陈文[2] 杨富全[1] 杨建民[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质科学院地质研究所,北京100037

出　　处：《岩石学报》2006年第1期236-244,共9页Acta Petrologica Sinica

基　　金：国家重点基础研究发展计划项目(编号:2001CB409807和G1999043216)资助的成果.

摘　　要：康古尔塔格金矿带呈东西向展布于新疆东天山晚古生代造山带的中部,发育在秋格明塔什-黄山韧性剪切带的南缘,阿奇山-雅满苏火山岩带的北缘,形成的金矿床可划分为三种主要端元类型,即浅成低温热液型(热泉型)、剪切带交代蚀变岩型、与中浅成花岗岩类有关的石英脉型。金的成矿作用主要受控于二叠纪后碰撞阶段秋格明塔什-黄山大型韧性剪切带形成的右行走滑剪切系统,在剪切系统的不同构造部位由于应力应变状态的不同、岩石渗透率的不同、构造层次(深度)的不同等,导致成矿流体和成矿物质在组成比例上的差异,从而形成不同类型的金矿床。所有类型的金矿资源是在同一构造环境下相同区域成矿事件的产物,在不同构造部位产出的金矿床类型可以组成一个连续的金矿化系列。区域一级剪切构造带控制金矿带成矿物质和成矿流体的主要来源,二级剪切构造控制金矿床的发育,三级剪切裂隙系统控制金矿体(脉)的产出,从而构成三级构造控矿系统。The east-west-trending Kanggurtag gold belt, over 300 kilometers in length, located in the middle of the Late Paleozoic Eastern Tianshan orogenic belt, Xinjiang, NW China, where there are about 30 gold deposits/occurrences discovered so far. The gold belt is developed along the south margin of the regional large-scale Qiugemingtashi-Huangshan ductile shear zone, and the north margin of the Aqishan-Yamansu volcanic rock zone. Gold deposits occurred in the belt can be classified into three members of ore types according to characteristics of occurrence and deposition, namely epithermal （ e. g. Shiyingtan）, shear-hosted replacement （ e. g. Kanggur）, and granitoid-related quartz vein （ e.g. Xifengshan）. Gold mineralization of the Kanggurtag gold belt is mainly controlled by the dextral strike-slip shear system developed along the Qiugemingtashi-Huangshan ductile shear zone during the Permian postcollisional stage, although the pre-enrichment of gold ore-forming materials may appear in the Late Carboniferous in the regional compressional regime. Along the ductile shear system, the different stress and strain distribution, different rock permeability, and different tectonic level cause to different proportion of ore-forming fluid and ore-forming material, resulting in different ore types, as well as the spatial distribution of all kinds of gold deposits. All of the gold resources are the products of the same regional metallogenic event in the same tectonic setting, and all of gold types developed on different tectonic section of the shear zone can comprise a gold deposit continuum. The regional first-order shear belt constrains the main sources of ore-forming material and ore-forming fluid, the second-order shear belt constrains the development of different gold type, and the third-order shear fracture system constrains the occurrence of gold orebody, constituting a three-level ore-controlling tectonic system.

关 键 词：金成矿作用 走滑断层作用 剪切系统 后碰撞 康古尔塔格金矿带 

分 类 号：P618.51[天文地球—矿床学]