吉林省金矿主要成矿期成矿地质条件初析

A PRELIMINARY ANALYSIS ON MAIN METALLOGENIC EPOCH AND CEOLOGICAL SETTING OF GOLD DEPOSITS IN JILIN PROVINCE

吉林省从太古宙至新生代整个地质历史时期都产有金矿床、矿点、矿化点。根据成矿特点、成因类型将区内划分太古宙、元古宙、古生代、中生代、新生代五个金矿成矿期。其中太古宙和中生代成矿期以内生成矿为主,元古宙、古生代成矿期以外生成矿为主,内生成矿为次,新生代成矿期为外生成矿期。各成矿期成矿地喷条件是:一、太古宙金矿成矿期吉林省太古宙地层为一套变质程度较深的变质岩系,亦称绿岩花岗地体。主要出露在南部地台区。包括龙岗群(早期绿岩),为以基、中性火山岩为主的拉斑玄武岩系列;夹皮沟群(晚期绿岩),为以基、中酸性火山岩为主的拉斑一钙碱性系列。它们都含有规模不等的金矿。但主要出现在晚期绿岩一夹皮沟群中,它呈近东西带状展布在早期绿岩(龙岗群)

According to the metallogenic characteristics of gold deposits in all geo- logical times,the authors divide the metallogenic epoch of gold into Archa- can,Proterozoic,Mesozoic,and Cenozoic,meanwhile,analyse the geological setting of metallogeny of gold deposits in all times and the relevant genetic types.Based upon the history of geological tectonic,the authors made a study on the auriferous characteristics and the regional distributional regu- larities of gold deposits,i.e.evolutional periodicity and irreversibility of gold,the more complicated for metallogenic conditions the more various for deposit types.