辽宁小佟家堡子金矿床成矿流体特征及来源讨论  

Characteristics of Hydrothermal Superimposition Mineralization and Fluid Origins of the Xiaotongjiapuzi Gold Deposit in Liaoning Province

作　　者：王一存[1] 王可勇[1] 张淼[1] 梁一鸿[1] 李剑锋[1] 付丽娟[1] 王志高[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130026

出　　处：《地质与勘探》2015年第1期79-87,共9页Geology and Exploration

基　　金：中国地质调查局地质调查项目(1212011120156)资助

摘　　要：小佟家堡子金矿床地处辽宁青城子矿田东南部,为一大型蚀变岩型矿床。矿床产于辽河群大石桥组三段白云石大理岩中,矿体呈层状、似层状产出。矿床由热液叠加改造作用形成,历经石英-黄铁矿、石英-碳酸盐两个阶段。流体包裹体研究表明,该矿床成矿流体属中低温、低盐Na Cl-H2O型体系热液。碳氢氧同位素地球化学的研究表明,石英-黄铁矿阶段成矿流体氧同位素δ18O组成在15.2‰~18.4‰,碳同位素δ13CV-PDB组成在-7.4‰^-13.2‰,氢同位素δD组成为-89.3‰^-92.2‰,反应该阶段成矿流体主要来自岩浆水并伴有少量的大气降水。石英-碳酸盐阶段成矿流体氧同位素δ18O组成在17‰~17.8‰,碳同位素δ13CV-PDB组成在-12.3‰^-13.5‰,氢同位素组成δD为-87.7‰^-90.4‰,表明该阶段成矿流体主要来自大气降水。The Xiaotongjiapuzi gold deposit is located in the southeast of the Qingchengzi mine field of Liaoning Province,which is a large deposit of alerted rocks. This deposit formed in dolomite marble in the Dashiqiao Formation of Liaohe Group with layered or quasi-layered orebodies. It might be resulted from hydrothermal superimposition,experiencing quartz-pyrite stage and quartz-carbonate stage. The study of fluid inclusions indicate that the oreforming fluids formed in hydrothermal superposition stage belongs to a low-temperature and low-salt NaC l-H2 O hydrothermal regime. Carbon hydrogen and oxygen isotope geochemistry research shows that oxygen isotopic δ18O in ore-forming fluids ranges from 15. 2‰ to 18. 4‰,Carbon isotope δ13CV-PDB varies from-7. 4 to 13. 2‰,and Hydrogen isotope δD is-89. 3‰ to-92. 2‰,implying ore-forming fluids in Quartz-pyrite stage stemed from magmatic water with little atmospheric precipitation. Oxygen isotopic δ18O in ore-forming fluids ranges from 17‰ to 17. 8‰,Carbon isotope δ13CV-PDB-12. 3‰^-13. 5‰,and Hydrogen isotope δD as-87. 7‰ to-90. 4‰,reflecting the ore-forming fluids in the quartz-carbonate stage mainly originated from atmospheric precipitation.

关 键 词：小佟家堡子金矿 热液叠加 流体包裹体 同位素 

分 类 号：P618.51[天文地球—矿床学]