Infrared Spectral Analysis and Prospecting of Alteration Minerals of Baijian Skarn-Type Iron Deposit in Han-Xing Area
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摘要: 邯邢地区是我国重要的富铁矿矿集区之一，随着找矿深度的增加，传统的勘查手段找矿效果并不理想，亟需新的方法和理念来指导进一步的矿产勘查工作.利用红外光谱技术（SWIR+TIR）快速厘定岩心内矿物类型、相对丰度和空间分布特征，揭示主要蚀变矿物波谱参数变化规律，确定与成矿相关的信息. 通过红外光谱测试，解译出二十余种矿物并划分出5个蚀变带，自岩体向围岩依次为绢云母-贫铁/铁镁绿泥石-方解石-钠长石带（蚀变带Ⅰ），贫铁绿泥石-蛇纹石-透闪石-阳起石-透辉石-金云母带（蚀变带Ⅱ），方解石-铁/白云石-菱铁矿带（蚀变带Ⅲ），绢云母-伊利石-方解石-白云石-菱铁矿带（蚀变带Ⅳ），绢云母-伊利石-高岭石-蒙脱石带（蚀变带Ⅴ）. 研究发现，越靠近矿化富集区域，绿泥石Fe-OH2250Pos、白云石6.45 μmPos和11.2 μmPos呈现降低的趋势；绢云母族矿物Al-OH2200FWHM的降低和高岭石族矿物Al-OH2170-IC的增大均指向更高温的流体环境.低Fe-OH2250Pos的绿泥石（< 2 245 nm）、低6.45 μmPos（< 6 440 nm）且低11.2 μmPos（< 11 250 nm）的白云石是白涧矿区有效的找矿标志；绢云母Al-OH2200FWHM的降低（30→22）和高岭石Al-OH2170-IC的增大（0.2→2.8）能判断深部是否存在矿化系统.以上成果为白涧矿区矿产勘查工作提供科学依据，同时也为邯邢地区同类型矿床找矿工作提供新方法.Abstract: The Handan-Xingtai area is one of the important iron ore concentration areas in China. With the development of prospecting work, the prospecting effect of the traditional exploration technology is not ideal, new exploration methods and prospecting concepts are urgently needed. Infrared spectroscopy (SWIR+TIR) can be used to rapidly determine the types and spatial distribution of altered minerals, the changing law of spectral characteristic parameters of altered minerals is revealed, and the information related to mineralization further determined. Through infrared spectroscopy tests, it deciphered more than 20 minerals and determined five mineral zonation, from rock mass to surrounding rock is sericite-chlorite-calcite-albite zone (alteration zone Ⅰ), chlorite-serpentine-tremolite-actinite-diopside-chrysolite zone (alteration zone Ⅱ), calcite-dolomite-siderite zone (alteration zone Ⅲ), sericite-illite-calcite-dolomite-siderite zone (alteration zone Ⅳ), sericite-illite-kaolinite-montmorillonite zone (alteration zone Ⅴ). The study shows that it is closer to the mineralization areas, the lower the chlorite Fe-OH2250Pos, the lower the dolomite 6.45 μmPos and 11.2 μmPos reflection peak. Reduction of Al-OH2200FWHM of sericite minerals and the increase of Al-OH2170-IC of kaolinite minerals reflects the hotter fluid environment. Chlorite of low Fe-OH2250pos value (< 2 245 nm), dolomite of low 6.45μmPos value (< 6 440 nm) and dolomite of low 11.2 μmPos value (< 11 250 nm) are effective prospecting sign in Baijian. The decrease of sericite Al-OH2200FWHM value(30→22)and the increase of kaolinite Al-OH2170-IC value(0.2→2.8) both can determine whether there is a mineralization system in deep. These research results provide a scientific basis for mineral exploration in the Baijian mining area, and also provide new ideas and methods for prospecting for the same type of deposits in Han-Xing area.
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Key words:
- infrared spectroscopy /
- skarn-type iron deposit /
- altered mineral /
- Han-Xing area /
- geophysics
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图 1 邯邢地区地层、岩浆岩及矿床分布（据Zhang et al.，2015修改）
a.华北克拉通中生代火成岩分布图；b.邯邢地区地质图
Fig. 1. Strata, igneous rocks and deposits of the Han-Xing region (modified after Zhang et al., 2015)
图 2 白涧矿区地质简图（据郝俊杰等，2011修改）
Fig. 2. Geological map of the Baijian region(modified after Hao et al., 2011)
图 5 白涧蚀变矿物镜下照片
Ser.绢云母；Chl.绿泥石；Di.透辉石；Phl.金云母；Tr.透闪石；Ab.钠长石；Amp.角闪石；Cc.方解石；Dol.白云石；Mnt.蒙脱石；Ill.伊利石；Mt.磁铁矿；Hem.赤铁矿；Py.黄铁矿. a.斜长石发生绢云母化，角闪石发生绿泥石化；b.内矽卡岩带透辉石；c.磁铁矿与金云母和透闪石共生；d.碳酸盐化；e.绢云母化+蒙脱石化+伊利石化；f.绿泥石化；g~h.斜长石和角闪石发生钠长石化，析出磁铁矿；i.内矽卡岩带透辉石和磁铁矿；j~k.磁铁矿和蛇纹石、透闪石共生；l.磁铁矿被赤铁矿和方解石交代
Fig. 5. Photographs of alteration minerals in Baijian
图 7 白涧矿区绿泥石2250Pos吸收峰位值变化示意图
Fig. 7. Sketch geological map showing chlorite 2250Pos absorption position from Baijian
图 8 ZK0818绢云母Al-OH2200FWHM和高岭石Al-OH2170-IC变化示意图
Fig. 8. Sketch showing of ZK0818 sericite Al-OH2200 FWHM and kaolinite Al-OH2170-IC
图 9 ZK0604碳酸盐矿物反射峰位值变化示意图
Fig. 9. Sketch showing carbonate minerals reflect position in ZK0604
图 10 ZK0606碳酸盐矿物反射峰位值变化示意图
Fig. 10. Sketch showing carbonate minerals reflect position in ZK0606
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