中国金矿床成矿规律与找矿预测研究

发布时间：2018-05-11 16:13

  本文选题：金矿 + 找矿预测　； 参考：《地学前缘》2017年06期

【摘要】：在系统分析研究中国1 572座小型及以上规模金矿床资料的基础上,以找矿预测为目的,根据成矿地质作用类型划分了沉积型、火山岩型、岩浆热液型和剪切带型金矿4种类型。提出了中国金矿床空间分布不均衡性和成矿时代爆发性特点:陆块区分布的金矿床占全国总金矿数的60%,中生代金矿占全国总金矿数的71.5%。研究发现侵入岩和次火山岩是金矿床最主要的成矿地质体,并总结了识别隐伏岩体空间位置的方法。通过对450座代表性金矿床地质事实的统计研究,提出中国金矿主要为两类:一类金矿床Au和Ag共伴生,成矿温度约250℃,Au的成色一般低于900,As和Sb含量极低,成矿早阶段形成强度不等的钾长石化、钠长石化;另一类金矿床Au和As、Sb共伴生,成矿温度低于250℃,Au的成色一般高于900,Ag含量低,成矿早阶段蚀变主要为硅化,有的为次生石英岩。以元素地球化学特征作为切入点,探讨了金从流体组分转变为成矿结构面中的固体矿物组分这一短暂过程的迁移沉淀机制,为金矿的找矿提供了借鉴依据。
[Abstract]:Based on the systematic analysis and study of the data of 1 572 small and large gold deposits in China, four types of gold deposits of sedimentary type, volcanic rock type, magmatic hydrothermal type and shear zone type are classified according to the ore-forming geological types for the purpose of prospecting and prediction. It is pointed out that the spatial distribution of gold deposits in China is unbalanced and the characteristics of metallogenic epoch are explosive: the gold deposits distributed in the continental block area account for 60% of the total gold deposits in China, and the Mesozoic gold deposits account for 71.5% of the total gold deposits in China. It is found that intrusive rocks and subvolcanic rocks are the most important ore-forming geological bodies in gold deposits, and the methods to identify the spatial position of concealed rock bodies are summarized. Based on the statistical study of the geological facts of 450 representative gold deposits, it is suggested that gold deposits in China are mainly of two types: one type of gold deposits are associated with au and Ag, and the mineralization temperature of au is generally lower than 900% as and SB content is very low. Potassium feldspar and albite are formed in the early stage of mineralization, and au and As-Sb are coexisting in another kind of gold deposit. The color of au at lower than 250 鈩，

本文编号：1874661