安徽青阳铜矿里钼多金属矿床地质特征及流体包裹体研究  

Geology and Fluid Inclusions of the Tongkuangli Molybdenum Polymetallic Deposit in Qingyang Area,Anhui Province,China

作　　者：孙康 曹毅[1] 张伟[2] 赵洋 SUN Kang;CAO Yi;ZHANG Wei;ZHAO Yang(School of Earth Sciences and Resources,China University of Geosciences,Beijing100083,China;Geophysical Survey Center of China Geological Survey,Langfang,Hebei065000,China;Langfang Natural Resources Comprehensive Survey Center of China Geological Survey,Langfang,Hebei065000,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质调查局地球物理调查中心,河北廊坊065000 [3]中国地质调查局廊坊自然资源综合调查中心,河北廊坊065000

出　　处：《现代地质》2021年第5期1371-1379,共9页Geoscience

基　　金：国家自然科学基金项目(41772064);中国地质调查局项目(DD20208017)。

摘　　要：安徽青阳铜矿里钼多金属矿床是长江中下游成矿带内近年来新发现的一个夕卡岩型钼多金属矿床。对该矿床的地质特征和流体包裹体特征进行了详细研究,探讨了流体来源与演化过程。基于脉体穿插和矿物交代关系将铜矿里矿床的成矿过程划分为早期夕卡岩、晚期夕卡岩、石英辉钼矿、石英多金属硫化物和碳酸盐矿物5个阶段。显微观察表明铜矿里矿床的流体包裹体类型主要为富液相包裹体、富气相包裹体和含子晶三相包裹体。显微测温结果显示,早期成矿流体具有高温、中高盐度的特征,而晚期成矿流体具有低温、低盐度的特征。结合已有的氢、氧同位素数据,表明铜矿里矿床早期热液为岩浆热液,晚期有大气水加入。石英辉钼矿阶段石英中出现富液相、含子晶三相和富气相包裹体共存的现象,且这些包裹体均一温度相近,但均一方式截然不同,表明流体沸腾作用可能是导致铜矿里钼多金属矿床中钼元素沉淀的主要机制。The Tongkuangli molybdenum polymetallic deposit in Qingyang area,Anhui Province is a skarn type Mo polymetallic deposit newly discovered in the Middle-Lower Yangtze River metallogenic belt in recent years.In this paper,the geological characteristics and fluid inclusion characteristics of the deposit are studied in detail,and the origin and evolution of fluids are discussed.Based on the cross-cutting relationship and mineral metasomatism,the mineralization process of the Tongkuangli deposit can be divided into five stages:early skarn,late skarn,quartz molybdenite,quartz polymetallic sulfide and carbonate stages.Microscopic observations show that the types of fluid inclusions in the Tongkuangli deposit are mainly liquid-rich,vapor-rich and daughter-bearing three-phase inclusions.Microthermometric results show that the early ore-forming fluids were high temperature,and medium to high salinity fluids,while the late ore-forming fluids were low temperature and low salinity fluids.This feature,combined with the existing hydrogen and oxygen isotope data,indicates that the early hydrothermal fluids in the Tongkuangli deposit were magmatic water,and that the magmatic water mixed with circulating meteoric water during the late stages.The coexistence of liquid-rich,three-phase and vapor-rich inclusions within quartz of the quartz molybdenite stage,and their similar homogenization temperatures with completely different homogenization way,indicating that fluid boiling may be the main mechanism of molybdenum precipitation in the Tongkuangli deposit.

关 键 词：夕卡岩型钼多金属矿床 矿床地质 流体包裹体 显微测温 青阳铜矿里 安徽 

分 类 号：P618.65[天文地球—矿床学]