WorldView-2高分蚀变遥感异常定量提取方法研究

Study on the Quantitative Extraction Method of High-resolution Alteration Remote Sensing Anomaly in WorldView-2

通过分析北岔沟门铅锌矿勘查区已知矿床(点)围岩、矿化蚀变岩及背景岩石硅酸盐13项分析数据及其样品粉末实测波谱数据,表明该区铅锌矿化围岩、蚀变岩石中氧化铁、氧化硫的含量远高于背景岩石中相应氧化物的含量。应用逐步回归、最小二乘回归方法建立了样品粉末WV-2高分遥感反射率与氧化铁+氧化硫含量高分遥感定量反演模型,二者间拟合系数为0.629,进而利用WV-2高分遥感数据反演了工作区内基岩出露区域氧化铁+氧化硫的含量,并对反演结果进行密度分割。结果表明,氧化铁+氧化硫含量在1%~35%间时与工作区已知矿床(点)和野外检查结果较为一致。最后分析了氧化铁+氧化硫的地质意义,为该区地质找矿工作提供了新的方向和技术手段。

Through analysis of 13 items silicate rock analysis data of the known ore deposits of surrounding rock and mineralization alteration rocks in Beichagoumen lead-zinc mine exploration area and background rocks,and samples of powder measured reflectivity in the north of Hebei Province,the results show that the ferric oxide and sulfur oxide content in lead-zinc mine surrounding rocks is higher than corresponding oxides content in the background rocks.Band6 to Band8 of WV-2 high spatial resolution remote sensing data reflect means of lead-zinc mine surrounding rocks are lower than background rocks',but the relation is inverse in Band6 to Band8.The characteristics are corresponding to the main absorption features of Fe 3+in goethite,hematite,and limonite between 0.4μm to 1.0μm wavelength.Based on stepwise regression and least squares regression method,the WV-2 quantitative inversion model between the samples of powder measured reflectivity and iron oxide+sulfur oxide content of samples powers are established respectively,and R2 is 0.629.The iron oxide+sulfur oxide content is reversed by WV-2 remote sensing data and density slicing.The result shows that the content range 1%~35%of iron oxide+sulfur oxide is consistent with the deposits(points)and the surveying in the field,which provides a new exploration field and technical means for geological prospecting in the area.