摘要
图古日格金矿床是内蒙古狼山-渣尔泰山多金属成矿带一大型金矿床,根据野外矿石类型和矿物共生组合关系可将金成矿作用分为钾长石-石英-黄铁矿阶段(早)、黄铁矿-方铅矿-黄铜矿-石英阶段(中)和石英-碳酸盐-黄铁矿阶段(晚)。文章对早、中、晚阶段的流体包裹体进行了系统的岩相学、显微测温和激光拉曼分析。研究结果表明,早阶段流体包裹体主要为富气、富液水溶液包裹体和CO_2三相包裹体,中阶段主要为水溶液包裹体和纯CO_2包裹体,晚阶段主要发育富液相水溶液包裹体。从早阶段到晚阶段,流体包裹体的均一温度逐渐降低,盐度先升高再降低。激光拉曼分析显示,包裹体的组分主要为水和CO_2,以及少量N_2。综合研究可知,早阶段成矿流体在演化过程中发生了以CO_2逸失为特征的流体不混溶作用;中阶段成矿主导因素为流体的混合作用;晚阶段成矿元素沉淀的主要原因为流体体系的自然冷却。综合矿床地质特征及前人研究成果,认为图古日格金矿是一个与岩浆岩有关的造山型金矿床。
The large Tugurige gold deposit is located along the Langshan-Zhaetaishan polymetallic metallogenic belt,Inner Mongolia. Based on ore types and mineral assemblages, three mineralization stages were recognized:① early stage, quartz-K-feldspar-pyrite veins;② middle stage, pyrite-galena-chalcopyrite-gold-quartz veins;and ③ late stage quartz-calcite-pyrite veins. Detailed petrographic and microthermometric studies show that there are mainly liquid-rich, vapor-rich aqueous and CO2-H2O three-phase inclusions in early stage veins, liquidrich aqueous and CO2 two-phase inclusions in middle stage veins and only aqueous inclusions in late stage veins. The homogenization temperature of the fluid inclusions decreases from early stage to late stage, while the salinities of fluid inclusions increase in middle stage and decrease in late stage. Raman microspectroscopic studies indicate that the fluid inclusions of three stages is mainly H2O and CO2, with subordinate N2. The metallic precipitation is caused by fluid immiscibility resulting from CO2 escaping in early stage, fluid mixing in middle stage and natural cooling of fluid system in late stage. Combined with previous research and geological evidence, the authors hold that the Tugurige gold deposit is a magmatism-related orogenic gold deposit.
作者
李永
熊伊曲
邵国钰
刘忠仁
孙诺
祁程
LI Yong;XIONG YiQu;SHAO GuoYu;LIU ZhongRen;SUN Nuo;QI Cheng(CNNC No. 208 Geological Party , Baotou 014010, InnerMongolia, China;Resource Institute and StrategicMineral Resources Collaborative Innovation Center, China University of Geosciences,Wuhan 430074, Hubei, China;Minmetals Exploration and Development Co., Ltd., Beijing 100011, China;Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050000, Hebei, China)
出处
《矿床地质》
CAS
CSCD
北大核心
2019年第2期319-330,共12页
Mineral Deposits
基金
国家自然科学基金项目(编号:41803044)
湖南省科技计划项目(编号:2017TP1029)联合资助
关键词
地球化学
成矿流体
石英脉型
金矿床
图古日格
geochemistry
ore-forming fluid
quartz-vein type
Au deposit
Tugurige
