板桥稀土矿遥感找矿信息提取与矿产预测研究

通过对离子吸附型稀土矿成矿规律的分析,从浙江省板桥地区的遥感地质特征研究入手,在研究区地表范围内进行稀土遥感找矿信息的提取。首先利用SPOT图像和DEM数据构建的坡度数据对与稀土成矿相关的地貌单元进行解译;然后通过光谱特征分析和基于ASTER图像的矿物遥感异常提取,获取与成矿相关的高岭土、绢云母、绿泥石等风化特征矿物的分布信息;最后叠合分析地貌、坡度及异常提取结果,进行稀土遥感找矿预测。与地质调查资料及化探数据的对比分析证实,上述方法对圈定1∶5万的大比例尺离子吸附型稀土矿分布范围是有效的,可为更详细的稀土矿产资源潜力评价提供依据。

The Remote Sensing Prospecting Information Extraction and Mineral Resources Prognosis in the Banqiao Rare Earth Mineral Deposit

In this paper,the prospecting information of the rare earth resources on Earth’s surface was extracted by analyzing the metallogenic regularity and geological remote sensing features of the study area.Firstly,the distribution of geomorphic units of Qedl was interpreted based on SPOT imagery and slope map obtained from DEM data.Then,the distribution of characteristic minerals closely related to rare earth deposits such as kaolin,sericite and chlorite was extracted by using remote sensing alteration anomaly extraction methods in the study area.At last,the potential rare earth ore districts were predicted by using overlap analysis of geomorphic units of Qedl as well as slope and abnormal extraction results.A comparison with the results of geological and geochemical survey shows that the remote sensing methods proposed in this paper are effective and reliable in prognosis of rare earth mineral distribution at the scale of 1∶ 50 000 and can provide useful suggestions for more detailed potential evaluation of rare earth mineral resources.