短波红外光谱技术在西藏尼木地区岗讲斑岩铜-钼矿床中的应用  

Application of Short-Wave Infrared Spectroscopy in Gangjiang Porphyry Cu-Mo Deposit in Nimu Ore Field, Tibet

作　　者：田丰 冷成彪[1] 张兴春[1] 田振东 张伟[1] 郭剑衡 Tian Feng;Leng Chengbiao;Zhang Xingchun;Tian Zhendong;Zhang Wei;Guo Jianheng(State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550081 [2]中国科学院大学,北京100049

出　　处：《地球科学》2019年第6期2143-2154,共12页Earth Science

基　　金：国家重点研发计划项目(No.2016YFC0600305)

摘　　要：为进一步探明岗讲斑岩铜-钼矿床蚀变和矿化结构,有效指导下一步勘查工作,利用短波红外光谱技术对矿床内典型剖面上的4个钻孔进行了系统的测试分析.共检测到绢云母类、高岭石类、绿泥石类、硫酸盐类和碳酸盐类等蚀变矿物,其中尤以绢云母类矿物最为发育.对绢云母进行短波红外光谱测试分析显示:在靠近矿体的位置,有较大的伊利石结晶度(≥1.5)和较小的绢云母Al-OH吸收位置(≤2 205 nm);而在远离矿体的位置伊利石结晶度和绢云母Al-OH吸收位置分别为0.8~1.2和2 207~2 209 nm.同时,铁氧化物强度值与氧化矿体的出现具有同步性.表明短波红外光谱的这些特征参数有助于进一步理解岗讲斑岩铜-钼矿床蚀变和矿化结构,有效识别成矿流体性质,有潜力成为该矿区及其他类似矿区有效的找矿指标.In order to reveal the alteration and mineralization structure of the Gangjiang porphyry copper-molybdenum deposit, the short-wave infrared spectroscopy (SWIR) technique was systematically used to analyze the four drill-holes in the typical section of the deposit. Five types of altered mineral groups were detected, i.e. sericite, kaolinite, chlorite, sulphate and carbonate. Short-wave infrared spectroscopy results of sericite show that there is a greater illite crystallinity (≥ 1.5) and a smaller sericite Al-OH absorption position (≤ 2 205 nm) towards the ore body. However, the value of illite crystallinity and sericite Al-OH absorption position distal the ore body are 0.8-1.2 and 2 207-2 209 nm, respectively. In addition, the iron oxide intensity value is synchronized oxidized ore body. It is indicated that these characteristic parameters of short-wave infrared spectroscopy are helpful to the understanding of the alteration and mineralization structure of the Gangjiang porphyry Cu-Mo deposit, which may effectively restricttheore-forming fluid condition and provideapotentialprospecting indicatorforthetargetmineand othersimilarmining areas.

关 键 词：地质学 围岩蚀变 绢云母 短波红外光谱 岗讲斑岩铜-钼矿床 矿床 

分 类 号：P614[天文地球—矿床学]