辽宁青城子矿田高家堡子银矿成矿流体特征及地质意义  

Characteristics of Ore-Forming Fluids in the Gaojiapuzi Ag Deposit of the Qingchengzi Orefield,Liaoning Province and Geological Implications

作　　者：赵岩[1,2] 张朋[2] 吕骏超[2] 张森[2] 寇林林[2] 杨志军 

机构地区：[1]中国地质大学(北京),北京100083 [2]沈阳地质矿产研究所,辽宁沈阳110034 [3]陕西省地质调查中心,陕西西安710068

出　　处：《地质与勘探》2015年第3期441-450,共10页Geology and Exploration

基　　金：中国地质调查(编码:12120113055600和12120113058700)项目联合资助

摘　　要：高家堡子银矿是产于辽宁青城子矿田内的大型银矿床。利用从该矿床所采集的含银石英脉及脉状铅锌银矿石样品,对矿床成矿流体进行了详细显微测温、激光拉曼光谱、群体包裹体成分及氢氧同位素测试研究。结果表明高家堡子银矿存在纯液相及水盐气液两相流体包裹体;流体包裹体显微测温揭示水-盐气液两相流体包裹体均一温度为122℃~202℃,主要集中在122℃至185℃之间;成矿流体盐度为1.05%~9.34%Na Cleq;激光拉曼测试显示包裹体主要由H2O、CO2、CH4等组成,与流体包裹体气相成分测试结果基本一致;成矿流体液相分析显示Na+、Mg2+、Ca2+、K+、Cl-、SO2-4为主要成矿流体的阴阳离子。结合矿田内已有H-O同位素测试分析结果,认为青城子矿田内金银矿成矿流体来自岩浆活动驱动的热液系统。高家堡子银矿为岩浆热液叠加早期沉积变质大理岩的浅成低温银矿床,岩浆活动在成矿中起了重要作用。The Gaojiapuzi silver deposit is a large scale one occurring in the Qingchengzi ore field,Liaoning Province. During field work in deposit,we collected fluid inclusion samples of silver-bearing quartz veins and Pb- Zn- Ag ore veins and made detailed analysis. It includes homogenization temperature tests under microscope,Laser Raman spectroscopy analysis and group contents tests of fluid inclusions. The results show that pure liquid inclusions and water-NaC l gas-liquid fluid inclusions are the prevalent ones in this deposit. Gas-liquid fluid inclusions are the main test target in this study and their homogenization temperatures are largely between 122℃ to 185℃. Salinity values of ore-forming fluids are calculated by inclusions freezing temperature,which range from 1. 05 to 9. 34% NaC leq. Laser Raman spectroscopy analysis shows that H2O,CO2and CH4 are the primary gases in fluid inclusions. Liquid analysis of the fluids also indicates that Na+,Mg2 +,Ca2 +,K+,Cl-and SO2-4are the main ions in mineralization fluids. In combination with existing H- O isotope analysis of the ore-field,we suggest that the ore-forming fluids of this orefiled came from a hot-fluid system driven by magma hydrothermal activity. We also think that the Gaojiapuzi Ag deposit is an epithermal deposit where magma hot fluids were superposed on early settled metamorphic marble and magma activity played a vital role in the mineralization.

关 键 词：流体包裹体 成矿流体 成矿机制 高家堡子银矿 青城子矿田 辽宁 

分 类 号：P618.52[天文地球—矿床学]