赣南银坑矿田土壤与汞气地球化学特征与成矿预测  

Geochemical Anomalies and Metallogenic Prediction in the Yinkeng Ore Field,Southern Jiangxi

作　　者：李伟[1] 刘翠辉 贺根文 张磊[1] 陈琪[1] 

机构地区：[1]江西省地矿局赣南地质调查大队,江西赣州341000

出　　处：《矿物岩石地球化学通报》2016年第6期1195-1202,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国地质调查局地质调查项目(12120114034801;121201004000150017-14)

摘　　要：银坑矿田位于南岭东段,是赣南最重要的Au-Ag找矿勘查区,区内最主要的矿床类型为破碎带蚀变岩型。为了对银坑矿田进行深部找矿,采用地质-土壤-汞气综合剖面测量的方法,对比研究了土壤元素和深穿透汞气的异常特征。结果显示,矿田土壤中,Au、Ag元素富集明显,Pb、Zn元素次之;不同地层所对应的土壤表现出不同的元素富集,如上施组地层区Au、Ag、Pb、Zn异常明显,隐爆角砾岩区Au元素较富集。土壤中汞气测量结果表明,破碎带、矿体都表现出明显的异常,矿体表现出高值异常,其峰背比均值达13.4,汞气最高值达5680ng/m3。根据异常特征,并对比地质信息及已有勘探成果,综合圈定出破碎带蚀变岩型银(金)铅锌多金属矿找矿远景区3处,隐爆角砾岩型金矿找矿远景区1处。The Yinkeng ore field area,located in the east section of the Nanling region,is the most important prospecting area for Au-Ag polymetallic deposits in southern Jiangxi.The dominant deposit type is altered tectonite-type in the area. The study applies a combined method of geology-soil geochemistry-mercury gas in profiling survey to investigate the anoma-ly of soil geochemistry and mercury gas.The different strata show variable elemental enrichment.The soil of this area is characterized by the enrichment of Au,Ag,Pb and Zn.The soil corresponding to the Shangshi Formation is enriched in Au,Ag,Pb and Zn,whereas the crypto-explosive breccia is enriched Au only.According to the results of the measure-ment on the soil mercury gas,the fracture zones and ore veins show significantly positive anomaly.Ore veins have extreme-ly high value of mercury gas with maximum contents of 5680ng/m^3 and average peak/background ratio of 13.4. Combining the contents of mercury gas and elemental anomalies of profiling survey and the achievement of geological explo-ration,four locations could be future exploration targets,including three locations for the altered tectonite-type Ag-Au polymetallic ore deposits and one location has great potential to form the crypto-explosion type gold deposit.

关 键 词：银坑矿田 破碎带蚀变岩型矿床 土壤地球化学 汞气 找矿远景区 

分 类 号：P618.52[天文地球—矿床学] P632[天文地球—地质学]