吉林省松江河地区地球物理异常特征及其地质意义

Geophysical anomalous characteristics in Songjianghe area,Jilin Province,and their geological significance

松江河地区位于吉林省东南部的金成矿区,该成矿区金成矿地质条件优越。本次研究通过在研究区布设1条北西—南东向1∶1万重力、磁法、可控源音频大地电磁法综合地球物理剖面,以确定深部地质信息,进而评价深部是否存在卡林型金矿床。综合地球物理剖面测量结果表明,研究区深部钓鱼台组地层倾向南西,其下伏存在高密度的珍珠门组大理岩,二者之间的不整合接触面存在低阻异常带薄层,为硅化蚀变角砾岩的反映。结合区域金成矿地质条件及矿化特征、钻探成果,推测松江河地区深部钓鱼台组砂岩与珍珠门组大理岩不整合接触面硅化蚀变角砾岩中赋存卡林型金矿床。

Songjianghe area is located in gold metallogenic district in the southeast of Jilin Province and the metallogenic district has favorable geological conditions for gold mineralization.The study has laid out a NW-SE 1∶10000 gravitational,magnetic and CSAMT comprehensive geophysical profile in order to identify the geological information in the deep part of the research area,and further to assess the potential of Carlin type gold deposits.Comprehensive geophysical profile survey indicates Diaoyutai Formation Lower Member strata trends SW in the deep part of the study area.High density Zhenzhumen Formation marble underlies.The low resistivity anomalous zone thin layer exists in the unconformity contact surface between them,indicative of silicified altered breccia.According to the regional geological conditions for gold mineralization,mineralization features and drill data,it is inferred that there exist Carlin type gold deposits in the silicified altered breccia on the unconformity contact surface between the Diaoyutai Formation sandstone and Zhenzhumen Formation marble in the deep part of Songjianghe area.