基底岩系对火山岩型金矿成矿的意义

本文以浙江治岭头、黑龙江团结沟、辽宁二道沟和日本菱刈等四个金矿床为例,说明火山岩型金矿之矿体除产于火山岩中之外,亦产于火山岩下伏基底岩系中,其基底岩系对火山岩型金矿成矿的意义在于:①基底岩石原岩常含有基性和超基性岩所含金丰度较高,且同位素资料显示出成矿的部分金来源于基底岩石;②基底岩系所含碳较高有利于金的成矿;③基底岩块相应上隆部位是成矿有利地带。

THE SIGNIFICANCE OF BASEMENT ROCK IN MINERALIZATION OF VOLCANIC ROCK TYPE OF GOLD DEPOSIT

In the paper，four examples of gold deposits are given as follows: Zhilingtou in zhejiang, Tuanjiegou in Heilongjiang，Erdaogou in Liaoning and Hishikari in Japan. The authors havepresented that the orebody of volcanic rock type of gold deposit occured in volcanic rock andunderlying basement rock series of volcanic rock．The significance of basement rock series inmineralization of volcanic rock type of gold deposit are as follows：1）the protolith of base-ment rock usually contained mafic and ultramafic rocks and high abundance of gold；2）thebasement rock with high content of carbon is beneficial to gold mineralization；3）the corre-sponding uplifting parts of basement block is the favourable area of mineralization.