摘要
西天山吐拉苏断陷盆地中广泛发育有多种类型与火山岩有关的金矿床,根据成矿特征、控矿因素和产出地质环境等可分为3种基本类型,即低硫浅成热液型金矿、斑岩型金矿和层控浅成热液改造型金矿。该3种类型的金矿是在相同的地质构造背景下和统一的流体场中形成的系列金矿组合———阿希型金成矿系列。次一级的流体场和具体的构造环境决定了具体金矿类型的产出;其成矿时间和产出部位均表现出相应的规律性:低硫浅成热液型金矿形成于早石炭世,产出于火山机构的边缘断裂中;斑岩型和层控热液改造型金矿形成于中晚石炭世,分别产出于酸性斑岩体内部及其边缘断裂裂隙系统中和大哈拉军山组第二岩性段中。
Several types of volcanics-related gold deposits are found in the Tulasu basin of the West Tian-shan.According to their mineralization features,ore-c ontrolling factors and geological envi ronment ,three basic types may be distinguished:low -sulfur epithermal type,porphyry type and stratabound epithermally modified type.They are an association of gold deposits formed in the same tectonic setting and in a unify-ing hydrothermal fluid field,i.e.the Axi type gold minerogenetic series.Secondary fluid fields and specific tectonic environments determined the certain regularities:the low-sulfur epithermal type formed in the Early Carboniferous and occurs in marginal faults of vol canic edifices;the porphyry and stratabound ep ithermally modified types formed in the Middle-Late Carboniferous and occur respectively in the fracture systems in-side acid porphyries and their margins and in the Second Member of the Dahalajun Formation.
出处
《中国地质》
CAS
CSCD
2002年第2期203-207,共5页
Geology in China
基金
中国地质调查局地质调查项目(20001020062003)资助。
关键词
低硫浅成热液型金矿床
斑岩型金矿床
层控浅成热液改造型金矿床
成因
成矿规律
West Tianshan
Tulasu basin
Axi type gold minerogenetic series
low-sulfur epithermal gold deposit
porphyry gold deposit
stratabound epithermally modified gold deposit
