Application of Short-Wave Infrared Spectroscopy in Gangjiang Porphyry Cu-Mo Deposit in Nimu Ore Field, Tibet
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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.Abstract: 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 restrict the ore-forming fluid condition and provide a potential prospecting indicator for the target mine and other similar mining areas.
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图 1 岗讲斑岩铜-钼矿床地质简图
Fig. 1. Simplified geological map of the Gangjiang porphyry Cu-Mo deposit
图 2 岗讲斑岩铜-钼矿床A勘探线地质剖面
Fig. 2. Geological section along A exploration line in the Gangjiang porphyry Cu-Mo deposit
图 3 岗讲斑岩铜-钼矿床岩矿岩心及显微照片
a.发育有A脉的钾化石英二长岩；b.石英二长斑岩；c.流纹英安斑岩；d.闪长质岩脉（深）侵入流纹英安斑岩（浅）中；e.浅绿色伊利石化叠加在早期钾化的石英二长岩之上，又被后期高岭石化（白色）沿后期裂隙所交代；f.强烈高岭石化的流纹英安斑岩；g.绿泥石化（绿色）石英二长斑岩被后期泥化（白色）沿裂隙交代；h.绿泥石-绢云母化流纹英安斑岩；i.后期热液将早期黑云母交代溶蚀为港湾状，并在其内和周围形成石英+绢云母+黄铁矿；j.黑云母被大面积蚀变为绿泥石；k.卡式双晶的钾长石内包含钾化形成的黑云母，并在边缘被绢云母交代；l.绢云母沿解理和裂隙交代钾长石.Bt.黑云母；Chl.绿泥石；Kfs.钾长石；Pl.斜长石；Py.黄铁矿；Qtz.石英；Srt.绢云母
Fig. 3. Drill core and microscopic photographs of rocks and ore in the Gangjiang porphyry Cu-Mo deposit
图 4 短波红外光谱特征参数示意图
Fig. 4. Schematic diagram of short-wave infrared spectrum characteristic parameters
图 5 岗讲斑岩铜-钼矿床主要蚀变矿物统计
Fig. 5. Statistical chart of alteration minerals at the Gangjiang porphyry Cu-Mo deposit
图 6 岗讲斑岩铜-钼矿床蚀变矿物大类分布
Fig. 6. Distribution diagram of alteration mineral groups at the Gangjiang porphyry Cu-Mo deposit
图 7 岗讲斑岩铜-钼矿床绢云母Pos2200值和IC值统计图
Fig. 7. Statistical chart of values about Pos2200 and IC at the Gangjiang porphyry Cu-Mo deposit
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