塔里木北缘库鲁克塔格地块大金沟金矿流体包裹体特征:对矿床成因的启示  

Fluid inclusions for Dajingou gold deposit of Quruqtagh block in northeatern Tarim:implication for ore genesis

作　　者：王秋玲[1,2] 孙洪涛[2] 丁俊英[1] 吴昌志[1] 金霄[1] 吕明阳[1] WANG Qiu-ling;SUN Hong-tao;DING Jun-ying;WU Chang-zhi;JIN Xiao;LU Ming-yang(State Key Laboratory for Mineral Deposits Research, School o f Earth Sciences and Engineerings Nanjing University,Nanjing 210046, China;East China Mineral Exploration and Development Bureau o f Jiangsu, Nanjing 210007, China)

机构地区：[1]南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室,南京210046 [2]江苏省有色金属华东地质勘查局,南京210007

出　　处：《世界地质》2016年第3期771-777,共7页World Geology

基　　金：中国地质调查局工作项目(1212011140056);国家自然科学基金(41272098;40872050)联合资助

摘　　要：在成矿地质背景和矿床地质特征研究基础上,对大金沟金矿主矿体中含矿石英脉流体包裹体开展了系统的岩相观察和显微测温工作。结果表明:大金沟金矿含矿石英脉中主要发育富液相的气液两相包裹体,偶见纯液相或气相包裹体。这些包裹体可分为低温高盐度(75℃~121℃,16.71 wt%NaCl^19.68 wt%NaCl)、低温低盐度(100℃~172℃,0.7 wt%NaCl^5.71 wt%NaCl)、中低温中低盐度(75℃~253℃,6.16 wt%NaCl^12.51 wt%NaCl)和高温中低盐度(331℃~420℃,4.96 wt%NaCl^12.51 wt%NaCl)等4类。大金沟金矿主成矿期流体包裹体的均一温度(75℃~253℃)和盐度(0.7 wt%NaCl^19.68 wt%NaCl)变化较大,且两者的相关性不明显,属典型的中低盐度流体体系,与造山过程相关的变质流体类似,表明该矿床可能为造山型金矿床。O n the basis of the research on geological background and characteristics of Dajingou glod deposit,the authors conducted petrographic observation and microthermometry on fluid inclusions from the gold-bearing quartz veins. The results show that most fluid inclusions in the samples are liquid-rich two phase gas-liquid inclusions,occasionally pure liquid or gas inclusions. These liquid-gas phase inclusions could be divided to low temperature( 7 5〇C ?121°C) and high salinity (16.71 w t % NaCl ?19.68 w t % N a C l ) ,low temperature ( 1 0 0〇C ?172°C ) and low salinity (0? 7 w t % NaCl ?5. 71 w t % N a C l ),low-middle temperature ( 7 5〇C ?2 5 3〇C ) and lowmiddle salinity ( 6. 16 w t % NaCl ?12.51 w t % NaCl) and high temperature (331°C ?4 2 0〇C ) and low-middle salinity (4. 96 w t % NaCl ?12. 51 w t % NaCl) inclusions. Homogenization temperatures and salinity of these fluid inclusions vary from 7 5 °C to 2 5 3 °C and 0. 7 w t % NaCl to 19. 68 wt % NaCl, respectively, without obvious linear relationship between them. The research results show that the fluids of Dajingoud gold deposit is typical middle-low salinity fluid system, similar to the orogenic metamorphic fluid, which resembles orogenic gold deposits.

关 键 词：流体包裹体 成矿过程 大金沟金矿床 库鲁克塔格地块 克拉通 

分 类 号：P618.51[天文地球—矿床学] P589.1[天文地球—地质学]