岩矿石NIR光谱特征与地球化学异常成分之间的关系:以内蒙古朱拉扎嘎金矿为例  

The relationship between the NIR spectral characteristics and geochemical anomaly components:taking Zhulazhagagold deposit of Inner Mongolia as an example

作　　者：丛丽娟[1] 贾志业[1] 梁秀娟[1] 夏玲燕[1] 李逸川[1] 余学中[1] 赵廷严 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083

出　　处：《地学前缘》2017年第5期299-305,共7页Earth Science Frontiers

基　　金：中国地质调查局项目(12120115039901)

摘　　要：以找矿为目的,开展矿区岩矿石反射光谱与地球化学异常成分之间的关系研究。以内蒙古朱拉扎嘎金矿为实验区,沿原P26号剖面线采集岩矿石样品,利用ASD野外光谱测试仪对样品进行光谱测试。在研究蚀变矿物光谱曲线特征和实测样品光谱数据的基础上确定提取与Al—OH、Mg—OH相关的光谱特征吸收深度参数H_(2205)和H_(2315),并研究其与地球化学异常成分之间的关系。通过分析发现,H_(2205)和H_(2315)与地球化学异常Au、Cu、Bi、Fe_2O_3、W、Mo、As有关,其中H_(2205)、H_(2315)与Bi、Fe_2O_3、W、Mo、As可以建立定量反演模型;H_(2205),H_(2315)与Au、Cu等主成矿元素定量关系不明确。研究表明,光谱吸收深度参数H_(2205)和H_(2315)反映成矿环境(高温热液环境和氧化环境)的能力较强,直接反映矿化成分(Au、Cu)的能力不明显。On the purpose of prospecting, we carried out the research of the relationship between mine rock spectral reflectance and geochemical anomaly components. Taking Zhulazhaga gold deposit as the experimentation area, along the original P26 profile, collected the rock and ore samples, the samples were tested by ASD FieldSpec FR. Based on the study of measured sample spectrum data and alteration minerals spectral curve from USGS and JPL, the spectral characteristics absorption depth parameter, H2205, H2315 were extracted, which are dependent on the spectral characteristics of Mg- OH and A1- OH, and the relationship between the spectral characteristics and composition of geochemical anomaly was studied. The results show that the H2205 and H2315 closely related to geochemical anomaly Au, Cu, Bi, Fe2Oa, W, Mo, and As; among them, a quantitative inversion model can be established between H2205, H2315 and Bi, Fe2O3, W, Mo, As, whereas the quantitative relationship between H2205, H2315and main ore-forming elements Au, Cu is not clear. The study showed that H2205 and H2315 can reflect mineralization environment strongly, such as high temperature hypothermal, or oxide environment, but are not good for reflecting mineral element composition.

关 键 词：光谱特征 Al—OH Mg—OH 地球化学异常 朱拉扎嘎金矿 

分 类 号：P618.51[天文地球—矿床学] O657.3[天文地球—地质学]