摘要
该区分布的碱性及中一中酸性火山岩一次火山岩,岩右中K_2O/Na_2O>1,(Na_2O+K_2O)/CaO>1.5是火山一次火山热液型金矿形成的重要条件;火山岩基底地层中有含金碎屑岩建造,并有含金丰度值较高的中性岩侵入,是沉积一岩浆热液叠加型金矿形成的重要条件;NNE、NW向断裂构造、火山构造及其低序次构造控制矿床(脉)的展布.预测火山岩盆地边部及外缘地带是找金的有望部位.
In the middle district of Nanjing-Wuhu area, the distributed basic and intermediate-intermediate acidic volcanic rock-subvolcanic rocks in which the ratios of K2O/Na2O is greater than 1 and Na2o+K2O/CaO is greater than 1.5 are the
important conditions for volcanic-subvolcanic hydrothermal type gold deposit to be formed.The Au-bearing fragmental rocks of volcanic basement and intermediate intrusive rock cpntainning Au higher than that of their Clarke values are the important conditions for sedimentary-magmatic hydrothermal superimposed type gold deposit to be formed.The NNE-NW fracturing structures, volcanic structures and low-order structures controlled the distribution of gold ore-bodies or veins.The edge and outer marginal district of the volcanic basin is the promising place of searching for such gold deposit.
出处
《黄金》
CAS
北大核心
1990年第9期1-6,36,共7页
Gold
关键词
金矿
控矿因素
成矿预测
宁芜中段
the middle district of Nanjing-Wuhu area
controlling factor
minerogenic prediction
