新疆准噶尔地区金矿床成矿流体稀土元素地球化学特征

REE geochemistry of ore-forming fluids of gold deposits in Junggar area,Xingjiang

新疆准噶尔地区出现大量不同类型金矿床,为了探讨它们的成因,为金矿床的找矿勘探提供依据。笔者进行了哈图、包谷图、阔尔真阔腊、科克萨依等金矿床包裹体流体中稀土元素及同位素等研究。结果表明,尽管它们成矿形式不同,规模不等,但它们的金均主要来自深源,并有地层物质参与。其中哈图金矿石英脉型矿体与蚀变岩型矿体是两种不同来源的流体叠加成矿,石英脉型矿体主要与哈图岩体岩浆流体关系密切,蚀变岩型矿体与深源流体有关。包谷图、阔尔真阔腊金矿矿、科克萨依金矿成矿流体主要来源于深源,成矿过程中受到浅成流体的综合影响。矿物包裹体流体的稀土元素特征主要反映了原始成矿流体来源,矿物的稀土元素特征可能较多地体现了矿床特有的后期地质作用.这在今后研究中将进一步探讨。

Many different types of gold mines occur in Jungger area, Xinjiang. Rare earth elements and isotopes in gold mines including Hatu Gold Mine, Baogutu Gold Mine, Kuorzhenkoula Gold Mine and Kekesayi Gold Mine have been studied to discuss the genesis of gold mines so as to provide ore-prospecting basement. It shows that though all the gold mines occur in different forms and scales, they are all originated from pluton and mixed by sediment during formation process. Quartz vein-type orebody and altered-rock-type orebody in Hatu Gold Mine were formed by superimposition of two fluids with different genesis. Quartz vein-type orebody is mainly intimately related with magmatic fluid of Hatu ore body, and altered-rock-type orebody is with plutonic fluid. Ore-forming fluids of Baogutu, Kuorzhenkela and Kekesayi Gold Mines are mainly originated from pluton and generally influenced by shallow-seated fluid during ore-forming process. Characteristics of REE of the fluid inclusions in minerals indicate the original source of ore-forming fluid. However, the analytical results of REE of minerals might display the special epigenic geological process of ore deposit. This will be futher discussed in the future's research.