本文選題：金礦 + 找礦預(yù)測(cè)��； 參考：《地學(xué)前緣》2017年06期

【摘要】：在系統(tǒng)分析研究中國(guó)1 572座小型及以上規(guī)模金礦床資料的基礎(chǔ)上,以找礦預(yù)測(cè)為目的,根據(jù)成礦地質(zhì)作用類型劃分了沉積型、火山巖型、巖漿熱液型和剪切帶型金礦4種類型。提出了中國(guó)金礦床空間分布不均衡性和成礦時(shí)代爆發(fā)性特點(diǎn):陸塊區(qū)分布的金礦床占全國(guó)總金礦數(shù)的60%,中生代金礦占全國(guó)總金礦數(shù)的71.5%。研究發(fā)現(xiàn)侵入巖和次火山巖是金礦床最主要的成礦地質(zhì)體,并總結(jié)了識(shí)別隱伏巖體空間位置的方法。通過對(duì)450座代表性金礦床地質(zhì)事實(shí)的統(tǒng)計(jì)研究,提出中國(guó)金礦主要為兩類:一類金礦床Au和Ag共伴生,成礦溫度約250℃,Au的成色一般低于900,As和Sb含量極低,成礦早階段形成強(qiáng)度不等的鉀長(zhǎng)石化、鈉長(zhǎng)石化;另一類金礦床Au和As、Sb共伴生,成礦溫度低于250℃,Au的成色一般高于900,Ag含量低,成礦早階段蝕變主要為硅化,有的為次生石英巖。以元素地球化學(xué)特征作為切入點(diǎn),探討了金從流體組分轉(zhuǎn)變?yōu)槌傻V結(jié)構(gòu)面中的固體礦物組分這一短暫過程的遷移沉淀機(jī)制,為金礦的找礦提供了借鑒依據(jù)。
[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，

本文編號(hào)：1874661