综合物化探技术在河南方城某金属矿勘查中的应用

Application of comprehensive geophysical and geochemical exploration technology in the exploration of a metal mining area in Fangcheng County,Henan

以往的地质资料显示,河南方城某勘查区存在岩浆热液型金属矿床的可能性较大,为此在该区采用综合物化探技术进行矿产勘查,勘查按“化探初选找矿靶区、物化探槽探筛选出成矿有利地段、物探探测矿体深部特征”的综合物化探方法进行。首先开展土壤地球化学测量,圈定了勘查区地球化学异常范围,推断可能为矿致异常。然后依据地球化学异常主要为铅锌多金属组合以及测区岩(矿)石物性特征,采用激电中梯法进一步缩小找矿范围,圈定了3个视极化率异常和4个视电阻率异常,结合勘查区岩(矿)石标本物性特征和化探成矿元素异常强度和变化趋势,推断出1个激电矿致异常,结合槽探工程推断F4构造为含矿构造。继而布置激电测深确定F4构造的产状和下部铅锌矿体的展布形态,最后钻孔施工验证。结果表明,P1铅锌矿体位于勘查区物化探异常套合较好部位,本次在勘查区开展的综合物化探勘查技术取得了较好的效果,其工作方法可为类似的矿产勘查区提供参考。

The geological data shows that there is a great possibility of a magmatic hydrothermal type metal deposit in a certain exploration area in Fangcheng County,Henan.Therefore,comprehensive geophysical and geochemical exploration technique is used for mineral exploration in this area.Firstly,soil geochemical survey is carried out to delineate the geochemical anomaly range in the exploration area,and it is inferred that it might be ore induced anomaly.Then,according to the geochemical anomaly mainly consisting of lead zinc polymetallic assemblage and the physical characteristics of rock(ore)in the survey area,IP ladder method is used to further narrow the prospecting scope,and three apparent polarizability anomalies and four apparent resistivity anomalies have been delineated.In combination with the physical characteristics of rock(ore)samples in the exploration area and the intensity and change trend of geochemical metallogenic element anomalies,one IP ore anomaly is inferred.In combination with the trench engineering,F 4 fault structure is inferred to be an ore bearing fault structure.Subsequently,the IP sounding is arranged to determine the occurrence of F 4 structure and distribution form of the lower lead-zinc ore body,and finally it is verified through drilling construction.The result indicates that P1 lead-zinc ore body is located in the exploration area where the geophysical and geochemical anomalies are well integrated.The comprehensive geophysical and geochemical exploration technology has achieved a good result in the exploration area,and the working methods can provide a reference for similar mineral exploration areas.