黔西南戈塘地区多元信息综合找矿方法研究

Study on comprehensive prospecting method of multi-information in Getang area of Southwest Guizhou

根据研究区成矿类型及成矿地质条件,开展了地质、地球物理、地球化学、遥感等多元地学数据处理及找矿信息提取,分析了各方法的应用效果。通过物探方法试验认为,重力可以推断出深大断裂,指示成矿流体的运移通道;可控源音频大地电磁测深测量能较好地反映埋藏较浅的成矿构造埋深及延伸情况;宽频大地电磁测深测量能较好地反映埋藏较深成矿构造的埋深及延伸情况。通过化探方法试验认为,构造地球化学相对于土壤地球化学更能直接提取与成矿相关的找矿信息,能较好的提取弱异常信息,直接指导找矿靶位;地电、地气地球化学方法能提取与成矿有关的指示信息,对强覆盖区寻找隐伏矿体有一定指示作用。通过遥感蚀变异常提取,可以较好地指示矿化蚀变情况及分布范围。根据研究区的成矿条件及覆盖情况,采用了多方法相结合,提取了多元找矿信息,为区内找矿科学预测提供参考依据。

Based on the metallogenic types and metallogenic geological condition of the study area,the paper has carried out the geological,geophysical,geochemical and remote sensing data processing and of ore-prospecting information extracting.For the application effects of various methods,it is concluded that gravity can infer deep and large faults,and can indicate the migration channel of ore-forming fluid.Controllable Source Audio Magnetotelluric Sounding Method can better reflect the buried depth and extension of ore-forming structures.Wideband magnetotelluric sounding can better reflect the buried depth and extension of deep buried ore-forming structures.According to the geochemical test,tectonic geochemistry is more able to directly extract ore-prospecting information related to mineralization rather than soil geochemistry,and can better extract weak anomaly information to circle out the ore-prospecting target areas directly.Geoelectric and gas geochemical methods can extract the exploration information related to the mineralization,and has the certain instruction function for thick coverage of concealed ore body.The remote sensing alteration anomaly extraction can well indicate the distribution range of mineralization and alteration.According to the metallogenic condition and coverage condition in the study area,the multiple methods are used to extract multiple prospecting information to provide a reference for scientific prediction of exploration in the area.