云南白牛厂银多金属矿床富CH_4流体包裹体发现及其矿床成因指示  

Discovery of CH4Rich Fluid Inclusions and Its Genetic Indication in Bainiuchang Ag-Polymetallic Deposit

作　　者：陈欣彬 孟柯柯 高建国[1] 蹇龙 刘岩[1] 

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]河北省国土资源厅信息中心,石家庄050051

出　　处：《地质科技情报》2016年第6期144-149,共6页Geological Science and Technology Information

基　　金：国家自然科学基金项目"滇中碳酸岩岩型铅锌矿床流体混合成矿机理研究"(41272111)

摘　　要：白牛厂银多金属矿床位于云南省蒙自市,前人针对该矿床成因进行了大量研究,但对于该矿床成矿流体特别是流体包裹体研究非常薄弱。系统地研究了与矿石伴生的石英和萤石中的流体包裹体,并首次发现了富CH_4流体包裹体。根据测温分析以及拉曼探针测试结果,将包裹体分为两类,一类主要气相成分为H_2O;另外一类气相成分主要为CH_4,并含有少量H_2S及微量的N_2、CO_2等气体。富甲烷流体是海底有机物还原海水形成,它的发现进一步佐证了白牛厂铅锌矿床的海底热液喷流成因;同时,富H_2O包裹体则体现了燕山晚期岩浆热液对于矿床的进一步叠加改造。Bainiuchang Ag-polymetallic deposit is located in Mengzi City, Yunnan Province. Many previous researches have been conducted , on the genesis of the deposit, but few researches are made on ore-forming fluid, especially fluid inclusions. This study makes a systematic research on fluid inclusions in Bainiuchang Pb-Zn deposit and for the first time identifies the mono-phase methane-rich fluid inclusions. According to temperature measurement analysis and Raman probe test results, the inclusions can be divided into two categories, H2O, and CH4, which contains a small amount of H2S, N2, CO2. The identification of methane-rich fluid further verifies the submarine hydrothermal exhalative genesis of Bainiuchang Pb-Zn deposit. At the same time, the H2O rich inclusion reflects the further superimposed reformation of the magmatic hydrothermal fluid in the late period of Yanshan.

关 键 词：CH4包裹体 萤石 海底热液 白牛厂银多金矿床 云南 

分 类 号：P618.52[天文地球—矿床学]