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采用激光微区~(40)Ar/~(39)Ar定年技术,对粤中长坑微细浸染型金矿主成矿期热液蚀变黏土矿物进行了测定,得出该矿金的主成矿年龄为109.9±1.4～110.1±1.3Ma,较银的主成矿年龄早30～50Ma。金和银的成矿均与该区隐伏花岗岩体无关,而可能都是沉积盆地演化的产物。研究表明激光微区~(40)Ar/~(39)Ar定年方法十分适用于微细浸染型金矿成矿时代的厘定。
The main hydrothermal alteration clay minerals in the main mineralization period of the Yuezhongchangchang fine gold-bearing gold deposit were determined by using the laser micro-zone (40) Ar / ~ (39) Ar dating technique. The ore age is 109.9 ± 1.4 ~ 110.1 ± 1.3Ma, which is 30 ~ 50Ma earlier than the main metallogenic age of silver. The gold and silver mineralization are not related to the concealed granite in this area, but may all be the product of sedimentary basin evolution. The results show that laser microdissection ~ (40) Ar / ~ (39) Ar dating is very suitable for determining the age of finely disseminated gold deposits.