| 尹艳广,贾润幸,方维萱,李述国,祁亚辉,张凯,李蒲刚.内蒙古额济纳旗格日勒图铜多金属矿深部综合信息提取及其指示意义[J].矿产勘查,2023,14(8):1421-1431 |
| 内蒙古额济纳旗格日勒图铜多金属矿深部综合信息提取及其指示意义 |
| Extraction of deep comprehensive information and its indicative significance of the Geriletu copper lead zinc polymetallic deposit in Ejina Banner， Inner Mongolia |
| 投稿时间：2023-04-25 修订日期：2023-07-06 |
| DOI：10.20008/j.kckc.202308009 |
| 中文关键词: 短波红外光谱 XRF 磁化率 铜多金属矿床 额济纳旗 内蒙古 |
| 英文关键词: short wave infrared （SWIR） spectroscopy XRF magnetic susceptibility copper polymetallic deposit Ejina Banner Inner Mongolia |
| 基金项目:本文受阿拉善盟融拓铜业开发有限公司项目“内蒙古额济纳旗格日勒图铜多金属矿概略研究及外围前景分析”资助。 |
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| 中文摘要: |
| 内蒙古额济纳旗格日勒图铜多金属矿床位于成矿地质背景优越的北山成矿带，是近几年新发现的矿床，然而，前人针对矿床深部蚀变矿物类型、地质体磁化率、成矿及相关蚀变元素分布特征研究相对不足，制约了勘查效率的提高。本文以该矿床为例，使用便携式短波红外（SWIR）光谱仪、X射线荧光光谱仪（XRF）以及手持磁化率仪对矿区钻孔岩心蚀变特征、成矿元素分布特征和磁化率特征进行研究，识别出主要蚀变矿物有高岭石、钾伊利石、针铁矿、白云母、赤铁矿、埃洛石以及白云石等。在垂向上，从上至下与铜矿化关系密切的3类蚀变矿物组合依次为：埃洛石+白云石、白云母+铁镁绿泥石、高岭石+钾伊利石。成矿元素分布特征表明，Cu、Pb、Zn、Ag元素XRF分析结果与地质剖面中矿化层化学分析结果趋势基本一致，岩心中绢英岩XRF分析结果值较高，绢英岩化可作为重要的找矿标志，另外Fe可以作为判断地质体矿化信息指示性元素，As分布较集中于浅部矿层中，在矿化部位含量较高，认为As元素可以作为判定浅部矿化体的指示性元素。钻孔岩心显示磁化率有玄武岩>（矿化）绢英岩>绢英岩>流纹岩>安山岩、云母石英片岩的变化特点。研究结果表明，矿区内蚀变矿物组合关系、成矿元素分布特征、高磁化率对矿区勘查找矿具有理论指导意义。 |
| 英文摘要: |
| The Geriletu copper polymetallic deposit in Ejin Banner， Inner Mongolia， is located in the Beishan metallogenic belt with superior metallogenic geological background and is a newly discovered deposit in recent years. However， the research on the types of deep altered minerals， magnetic susceptibility of geological body， distribution characteristics of mineralization and related altered elements in the deposit is relatively insufficient， which restricts the improvement of exploration efficiency. In this paper， via using portable short-wave infrared （SWIR） spectrometer， X-ray fluorescence （XRF） and handheld magnetic susceptibility meter， a case study of the Geriletu copper polymetallic deposit is presented， aiming to investigate the alteration characteristics， distribution of ore-forming elements， and magnetic susceptibility of drill cores. The main identified altered minerals include kaolinite， potassium illite， goethite， muscovite， hematite， halloysite， dolomite， et al. From top to bottom， three distinct altered mineral assemblages that are closely connected to copper mineralization are identified vertically： kaolinite+potassium illite， muscovite+ferromagnesian chlorite group and halloysite+dolomite. According to the distribution features of ore-forming elements， the XRF analysis results of Cu， Pb， Zn， and Ag elements are consistent with that of the mineralized layer in the geological profile. High content of sericite was observed in the core through XRF analysis， suggesting that sericite mineralization serves as an important prospecting indicator. Iron （Fe） can also be utilized as a mineral indicator to evaluate the mineralization data of geological entities. The drill core reveals differences in magnetic susceptibility， with basalt> （mineralized） sericite>sericite>rhyolite>andesite， indicating variations in micaschist. In summary， distribution of ore-forming components， association of changed minerals， and high magnetic susceptibility in mining area all show theoretical significance for prospecting and exploration. |
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