摘要
西天山吐拉苏盆地中发育的低硫浅成低温热液型金矿、斑岩型金矿和层控浅成低温热液改造型金矿属于与晚古生代火山次火山岩系有关的金矿组合———阿希型金成矿系列。通过对各类型金矿含金石英脉矿物包裹体流体成分的分析 ,吐拉苏盆地中可以区分出两期不同的流体场 ,分别是成矿前的统一流体场和成矿期的局部流体场。前者是伴随着早石炭世大哈拉军山组火山爆发而形成的产物 ;后者是在成矿前统一流体场的基础上 ,受局部热动力活动影响而形成的局部成矿流体场 ,又可分出 3种不同的类型。成矿前统一流体场与成矿期 3种局部流体场流体均属于K+SO2 -4型 ;总体特征上具有相似性 ,均为火山、岩浆热液水和大气水的混合水 ;流体成分有随时间而呈有规律变化的现象 ;阳离子K+和阴离子SO2 -4随时间逐步减少 ,表明火山、岩浆活动随时间对流体的影响逐渐减弱 ;水的含量逐步增高 ,则表明流体随时间大气水参与程度的提高 。
The gold deposits found in Tulasu Basin of West Tianshan area belong to epithermal gold deposits related to continental volcanic\|intrusive complexes, which can be divided into three types: low sulphide epithermal type, porphyry type and stratabound\|reformation epithermal type. The study of fluid inclusions shows that the three types of gold deposits have experienced a similar history of hydrothermal system of pre\|metallogenic phase and a subordinate hydrothermal system of syn\|metallogenic phase. Of the same hydrothermal system of pre\|metallogenic phase and the subordinate hydrothermal system, the former was the result of the volcanic eruption; the latter was formed by local dynamical activity in the basin of the former and could be divided into three types. Both of the two fluid systems are K + SO 2- 4 types, and there are comparabilities for most characters,and all of them belong to the mixed fluid of volcanic magmatic water and meteoric water. There is a regular change with time in the elements of the two kinds of fluid systems. K + and SO 2- 4 gradually decrease, and the content of meteoric water obviously increases.
出处
《地学前缘》
EI
CAS
CSCD
2001年第4期277-280,共4页
Earth Science Frontiers
基金
中国地质调查局地质调查项目 ( 2 0 0 0 10 2 0 0 62 0 0 3)
