基于PMGRA气体地球化学测量在辽东浅覆盖区找矿的可行性

Feasibility of Prospecting Based on PMGRA Gas Geochemical Survey in Shallow Covered Area of Liaodong Area

气体能携带深部矿化信息沿着岩石裂隙和断裂带迁移至地表,因此气体地球化学方法可以用于寻找覆盖层以下的隐伏断裂和矿体.基于便携式多组分气体快速分析仪(PMGRA),应用气体地球化学方法对辽东地区五龙金矿区和青城子地区开展了探索性的试验研究,并辅以相应的土壤地球化学测量进行对比.结果显示,异常区气体的浓度衬值非常大;在部分气体异常区,沿着构造倾向方向,具有CO2异常峰值出现在H2S、SO2和CH4之前的特点.在辽东浅覆盖区,气体和土壤地球化学测量均能反映隐伏构造和矿体;而在覆盖较厚地区,气体地球化学测量对断裂和矿体反映更明显,受覆盖层的类型和厚度影响较小.本次试验结果初步显示了基于PMGRA气体地球化学测量方法在浅覆盖区具有一定的可行性.

Gas can carry deep mineralization information migrated to the surface along the rock fissures and fault zones.Therefore,gas geochemical methods can be used to find hidden faults and ore bodies below the cover layer.Based on the Portable Multi-Component Gas Rapid Analyzer(PMGRA)geochemical method,exploratory experimental studies were carried out in Wulong gold mining area and Qingchengzi area,Liaodong area,and supplemented by corresponding soil geochemical surveys for comparison.The results show that the concentration of the gas in the abnormal area is very large,with the abnormal peaks of CO2 appearing before H2 S,SO2 and CH4 in part of the gas anomaly area,along the structural dip direction.In the shallow covered area of Liaodong,both gas and soil geochemical surveys can reflect hidden structures and ore bodies.However,in the thicker covered area,gas geochemical surveys can more clearly reflect the faults and ore bodies,and are less affected by the type and thickness of the cover layer.The results of this test initially show the feasibility of PMGRA geochemical survey method in shallow covered area.