老挝中-东部大型铁铜金矿矿集区矿床地质——对云南“三江”地区找金的启示  

GEOLOGICAL CHARACTERISTICS OF THE LARGE FE-CU-AU CONCENTRATION AREA IN MIDDLE-EAST LAOS AND ITS REFERENCE SIGNIFICANCE FOR AU-PROSPECTING IN THREE-RIVER REGION OF YUNNAN

作　　者：何文举 

机构地区：[1]云南地质矿产勘查开发局第三地质大队,云南大理671000

出　　处：《云南地质》2004年第2期164-178,共15页Yunnan Geology

摘　　要：矿集区分布在NW向川塘 长山华力西断皱带南西缘,系多陆块拼接缝合构造环境。印支 燕山期～喜马拉雅期花岗岩类岩浆活动及其相关的成矿作用,通过高效率浓集机制,形成一串锡、铁、铜、金等矽卡岩型、斑岩型和热液型矿床,组成矿床系列,包括多个超大型、大型矿床。这些成因上密切相关的矿床,成矿时间显然相近,却处在不同岩浆活动阶段和不同地质环境中,矿化特征有明显差异,矿种和矿化类型在时空分布上具有规律:印支 燕山期的花岗岩侵入阶段形成矽卡岩型富磁铁矿矿床;在花岗岩浆分异演化浅成相侵入阶段,形成矽卡岩型及岩浆晚期、自交代产生的斑岩型;而最后形成岩浆期后热液型铁 金、铜、金矿床。文章侧重讨论铁、铜、金矿床系列的成矿构造环境、岩浆作用、物质来源及高效率浓集机制,对云南"三江"地区找金有重要启示。The large Fe-Cu-Au concentration area in middle-east Laos is distributed along the SW margin of Xieng Khouang-Changshan fold belt with NW trending and in the tectonic setting of matching and suturing landmasses. This paper is to study the metallogenesis related to Indosinian-Yanshanian-Himalayan granitoid magmatic activity, which has formed a lot of Sn-Fe-Cu-Au deposits, including large and superlarge porphyry, skarn and hydrothermal ore deposits. These ore deposits are formed by the same major geological action and in similar times. And the metallogenesis is closely related to the intrusive rocks in time, space and genesis. The magnetite skarn deposits with high-grade ore are formed mainly in the large-scale intrusion stage of Indosinian-Yanshanian granites. The skarn and porphyry Cu-Au deposits are formed by the deuteric autometasomatism in hypabyssal-superhypabyssal intrusion stage of granitic magma evolution. And the postmagmatic hydrothermal Cu-Au deposits are the end products. The discussion in this paper is focused on the metallogenetic tectonic setting, magmatic evolution, metal source and its concentration mechanism, which have an important reference significance for Au-prospecting in three-river area of Yunnan.

关 键 词：成矿构造环境 岩浆作用 浓集机制 矿床成矿系列 老挝中-东部 

分 类 号：P611.1[天文地球—矿床学]