哈密金窝子金矿床同位素地球化学研究

Isotope Geochemistry of the Jinwozi Gold Deposit,Hami, Xinjiang

笔者通过对金窝子金矿床的氢、氧、硫、碳、铅同位素的研究发现:成矿流体主要是建造水;硫的来源是矿区的沉积建造和金窝子岩体;碳则主要是沉积建造中的碳酸盐岩;铅大部分来自地壳且与花岗岩关系密切,部分来自地幔。于是,概括该矿床的成矿动力学过程可为:在矿区长期此开彼合的构造动力场中,封存在沉积建造中的建造水在层间裂隙和构造裂隙中逐渐汇集、运移,并不断汲取围岩中的成矿物质而演化为成矿热液。最后成矿热液在矿区构造应力下,在岩体的张性裂隙中交代充填成矿。

Hydrogen, oxygen, sulfur, carbon and lead isotopes of the Jinwozi gold deposit, Hami, Xinjiang, indicate that the ore-forming fluid came from the stratum formation water; sulfur was from the stratum and granite; carbon came from the carbonatite in the stratum; lead was mainly from the crust and associated with the granite. From the data above, the authors concluded that the formation process of the deposit was long lasting. At first, water in the stratum congregated into fluid for a long time. At the same time, the fluid converted into ore-forming fluid by the dissolution of the host rock. At last, because of the alteration with the host rocks, the ore-forming fluid was depleted and the matters in it precipitated, and then the gold deposit came into being.