新疆北山红十井金矿床成矿流体性质及成矿机制  

Ore-forming mechanism and property of metallogenic fluids of the Hongshijing gold deposit at Beishan,Xinjiang Autonomous Region

作　　者：霍永豪 吕新彪[2,3] 尚世超[2] 曹晓峰[2] 毛晨[2] 王金荣 Huo Yong-hao;Li Xin-biao;Shang Shi-chao;Cao Xiao-feng;Mao Chen;Wang Jin-rong(Key Laboratory of Western China＇s Mineral Resources of Gansu Province,School of Geological Sciences and Mineral Resources,Lanzhou University,Lanzhou 730000,China;Faculty of Resources,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]兰州大学地质科学与矿产资源学院甘肃省西部矿产资源重点实验室,兰州730000 [2]中国地质大学资源学院,武汉430074 [3]中国地质大学地质过程与矿产资源国家重点实验室,武汉430074

出　　处：《兰州大学学报（自然科学版）》2018年第3期292-302,共11页Journal of Lanzhou University(Natural Sciences)

基　　金：中央专项基金358项目(12120113043500);国家305项目(2011BAB06B04-05)

摘　　要：通过对红十井金矿床热液期各阶段含矿石英及方解石中流体包裹体进行岩相学、显微测温学研究和激光拉曼光谱分析,探讨其成矿流体性质及成矿机制.热液期第Ⅰ、Ⅱ、Ⅲ阶段包裹体液相和气相成分均主要为H_2O,第Ⅰ、Ⅱ阶段包裹体气相成分可检测到较多CO_2,第Ⅱ阶段包裹体气相成分可检测到极少量的CH_4、SO_2;第Ⅱ阶段包裹体中可见极少量NaCl子晶.红十井金矿床成矿流体演化特征:第Ⅰ阶段温度中等偏高、盐度中等、为含有少量CO_2气相成分的H_2O-CO_2-NaCl流体体系;第Ⅱ阶段中温、盐度从低到高均有分布、为含有较多CO_2气液相成分的H_2O-CO_2-NaCl流体体系;第Ⅲ阶段温度中等偏低、盐度中等偏低、为无CO_2气液相成分的H_2O-NaCl流体体系.红十井金矿成矿流体普遍经历了流体不混溶过程,最终导致矿质沉淀.In order to investigate the ore-forming mechanism of the Hongshijing gold deposit, fluid inclu- sions in three stages ore-bearing quartz and calcite veins from the Hongshijing gold deposit have been studied. Laser Raman spectroscopic analysis showed that the liquid components and the gas components of fluid inclusions in three stages are mainly H：O. There are a lot of amounts of CO2 detected from the gas components of fluid inclusions in the stages Ⅰ and Ⅱ. There are minor amounts of CH4 and SO2 detected from the gas components of fluid inclusions in the stage Ⅰ. There are minor amounts daughter minerals （halite） detected from the fluid inclusions in the stage Ⅱ. The evolutional characteristics of ore-forming fluid of the Hongshijing gold deposit are the following： ore-forming fluids in stage I contain minor amounts gas-phase CO2 in H20-CO2-NaC1 system with high to moderate homogenization temperature and moderate salinity; ore-forming fluids in stage Ⅲ contain a large amounts of gas-phase and liquid-phase CO2 in H2O-CO2-NaCl system with moderate homogenization temperature, high to low sa[inities; ore- forming fluids in stage Ill are lacking of gas-phase and liquid-phase CO2 in H20-NaC1 system with moder- ate to low homogenization temperature and low salinities. We infer that the ore-forming fluid of the Hong- shijing gold deposit has experienced the un-mixing process which caused the precipitation of large quanti- ty metallogenic material.

关 键 词：流体包裹体 激光拉曼 流体不混溶 红十井金矿床 新疆北山 

分 类 号：TU18[建筑科学—建筑理论]