西藏德明顶铜钼矿床短波红外光谱特征及勘查指示意义

德明顶矿区因交通不便、高寒缺氧、物理风化强烈、倒石堆覆盖严重等原因，找矿效果不理想.为进一步指导野外矿产勘查，在详细的野外观察的基础上，系统开展了短波红外光谱分析测试工作.结果显示，绢云母短波红外光谱标量在空间上呈现规律性变化，由浓集中心向外Al-OH吸收峰波长逐渐变长、Al-OH吸收峰深度逐渐降低、SWIR-IC值逐渐变小，且三者套合较好，表明该区域流体温度、压力高于外围，为热液蚀变矿化中心.结合蚀变规律、成矿岩体中锆石U-Pb年龄与辉钼矿Re-Os同位素年龄结果，在矿区内圈定了1处重点勘查靶区，为晚期铜矿化与早期（铜）钼矿化叠加的区域.该技术可以有效地指导野外矿产评价、降低勘查成本，是中国西部特殊景观区找矿勘查评价的重要方法之一. 

Short-Wavelength Infrared Characteristics and Indications of Exploration of the Demingding Copper-Molybdenum Deposit in Tibet

The ore exploration of Demingding mining area of the Gangdese metallogenic belt has been challenging due to inconvenient transportation,high altitude and lack of oxygen,strong physical weathering and cover of the crushed stone. In order to further guide the field mineral exploration,we carried out systematic short-wave infrared spectroscopy analysis based on detailed field observation and cataloging. The scalars of sericite minerals in the short-wave infrared spectrum show a regular change in space. From the concentration center to periphery,the absorption peak wavelength of the Al-OH (Pos2200) gradually becomes longer,the depth of the Al-OH absorption peak (Dep2200) gradually decreases,and the SWIR-IC value gradually becomes smaller. And the three zones are well fitted,which indicates that the temperature of the altered sericite minerals formation is higher and the pressure is higher in the region. Combined with the zircon U-Pb age and the molybdenite Re-Os isotopic age in the ore-forming rocks,we estimate an exploration target area in the mining area where the late copper mineralization overlaps with the early (copper) molybdenum mineralization. Short-wave infrared spectroscopy can quickly and effectively guide mineral exploration and reduce exploration costs. Therefore,it can be used as one of the important methods for prospecting and evaluation of western special landscape areas.