不同类型热液金矿床主成矿期黄铁矿成分标型特征

Compositional characteristics of pyrite ore formed in the main metallogenic period of various types of hydrothermal gold deposits

黄铁矿作为成矿热液活动的产物,是热液金矿床中最为重要的载金矿物,其成分标型特征记录了大量矿床成因信息。在分类总结了各类型热液金矿床关键地质特征的基础上,采用比较矿床学的研究思路,较为系统地分析了不同类型热液金矿床中主成矿期或与金矿化同期的黄铁矿的主微量元素及组合特征、(Fe+S)As特征、δFeδS特征、As Co Ni特征以及热电性特征。结果表明,不同类型热液金矿床中的黄铁矿成分特征具有显著差异,彼此显示出特征性的成因标型特征,可作为判别热液金矿床成因的依据。结合各类热液金矿床形成的构造背景,提出热液金矿床是研究大陆动力学的理想对象。通过这些研究,初步建立了不同类型热液金矿床地质与黄铁矿成分标型特征之间的耦合关系,为今后热液金矿床成因的判别和黄铁矿标型特征的进一步研究提供一定的参考。

Pyrite ore,aproduct of metallogenic hydrothermal activity,is one of the most important goldbearing ores in hydrothermal gold deposits,with a wealth of genetic information recorded in its chemical composition.Based on the classification and summary of key geological features of different types of hydrothermal gold deposits,and adopting the research methodology of comparative metallogeny,we systematically analyzed the compositional characteristics of major and trace elements and their combinations and that of(Fe+S)-As,δFe-δS,As-Co-Ni,as well as thermoelectricity of pyrite ore formed during the main metallogenic period of various gold deposits or by co-deposition with gold.The results show that the chemical compositions of pyrite ores from different type of hydrothermal gold deposit are significantly different,and the compositional characteristics can be used to identify the genesis of hydrothermal gold deposits.We also proposed that hydrothermal gold deposits are ideal objects for studying continental dynamics when tectonic settings are also taken into consideration.Through these studies,we established preliminarily a coupling relationship between geological features and compositional characteristics of pyrite ore.This relationship will help future identification of the the genesis of hydrothermal gold deposits and further typomorphic characterization of pyrite ores.