桂东北苗儿山中段向阳坪铀矿床钻孔岩心高光谱特征分析  

Spectral Characteristics Analysis of Drill Core in the Xiangyangping Uranium Deposit in the Middle Miaoershan Mountain,Northeastern Guangxi

作　　者：张川[1] 叶发旺[1] 王建刚 邱骏挺[1] 孟树[1] ZHANG Chuan;YE Fawang;WANG Jiangang;QIU Junting;MENG Shu(National Key Laboratory of Remote Sensing Information and Image Analysis Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室

出　　处：《铀矿地质》2019年第6期366-372,共7页Uranium Geology

基　　金：国家自然科学基金项目（编号：41772354）;铀矿地质生产中科研项目（编号：遥D1808）资助

摘　　要：热液蚀变是向阳坪花岗岩型铀矿床的重要找矿标志。利用ASD光谱仪对向阳坪矿床两个含矿钻孔进行岩心高光谱测量,基于光谱分析和光谱匹配技术提取了高岭石、蒙脱石、富铝绢云母、贫铝绢云母、赤铁矿、绿泥石+绢云母、碳酸盐等7类蚀变矿物信息。高光谱岩心编录与钻孔岩性、构造、矿化的综合分析结果表明:豆乍山和香草坪岩体对热液蚀变类型及发育程度的影响均不大,铀矿化和相关的热液蚀变发育主要受断裂构造控制,绿泥石+绢云母、蒙脱石、贫铝绢云母形成于矿前期,赤铁矿、富铝绢云母、高岭石及碳酸盐形成于成矿期-成矿晚期,构造带中的赤铁矿+富铝绢云母+高岭石可作为向阳坪地区铀矿化标型矿物组合。Hydrothermal alteration is an important prospecting indicator in the Xiangyangping granite type uranium deposit.The ASD spectrometer was used to measure the cores of two ore-bearing boreholes in the deposit.Seven types of altered minerals including kaolinite,montmorillonite,Al-rich mica,Al-poor mica,hematite,chlorite+mica and carbonate were extracted based on spectral analysis and spectral matching technology.The comprehensive analysis of spectral logging,lithology,structure and mineralization of boreholes indicate that the lithologic constrain effects of the Douzhashan and the Xiangcaoping granite are not significant for alteration types and their intensity,and uranium mineralization and related hydrothermal alteration development are mainly controlled by fault structure.Chlorite+mica,montmorillonite,and Alpoor mica are formed in pre-ore stage;hematite,Al-rich mica,kaolinite and carbonate are formed in ore forming and post-ore forming stage.The assemblage of hematite+Al-rich mica+kaolinite in the tectonic belt can be used as a typomorphic mineral assemblage of uranium mineralization in the Xiangyangping area.

关 键 词：向阳坪铀矿床 高光谱 钻孔岩心 蚀变矿物 

分 类 号：P627[天文地球—地质矿产勘探]