勐海县南罕金多金属矿矿床地质特征及成因浅析

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中国地质大学（北京）

成人高等教育

本科毕业论文

题目勐海县南罕金多金属矿矿床地质特征及成因浅析

英文题目

2014年1月

中国地质大学（北京）

成人高等教育

本科毕业论文

题目勐海县南罕金多金属矿矿床地质特征及成因浅析

英文题目

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2014年1月

中国地质大学（北京）继续教育学院本科毕业设计（论文）任务书

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课题性质：设计论文

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中文摘要

云南省勐海县南罕金多金属矿矿区位于冈底斯—念青唐古拉褶皱系(Ⅰ)昌宁—孟连褶皱带(Ⅱ)临沧—勐海褶皱束(Ⅲ)之临沧—澜沧复背斜的南部。区域地层出露上元古界澜沧群和中生界侏罗系、白垩系及第四系；区域构造以北西向压扭性断层为主，北东向次之；岩浆岩以燕山—印支期花岗岩为主，花岗岩内分布有石英脉、石英斑岩、花岗斑岩、花岗岩脉等。

南罕金矿区位于呈北北西-南南东向展布的印支期勐啊岩体及具一定规模的南木旱（F1）断层南西侧。矿体赋存于总体呈北东向展布的F2断层破碎带内外，及F2断层北东段向北偏转之东侧中侏罗统花开左组下段第一、二层中。有用组分沿岩石节理、裂隙中富集产出。矿体主要呈似层状、透镜状等，含矿岩石为碎裂粉砂质泥岩、断层角砾岩。矿体走向北东或北西的，倾向北西或南东，倾角变化较大，总体属陡倾斜矿体。

矿石的矿物成分主要为自然金；脉石矿物主要为石英和绢云母，次为高岭石。矿石结构主要以泥质结构、显微鳞片状结构为主，次为微晶结构，偶见细砂结构，它形粒状结构，胶状结构，假象结构，蚀变粉砂结构；矿石构造以土块状构造为主，次为皮壳状构造、网脉状构造、角砾状构造等。矿石的有益组分为金，其次为银，银未达伴生组分指标评价要求；伴生有害组分含量低微。矿石氧化率在85%以上，矿石自然类型均属氧化矿石；工业类型属微细粒金矿石。矿床成因类型为受构造控制的低温热液型金矿床。

关键词：南罕；金矿；低温热液

ABSTRACT

Menghai County of Yunnan province Nanhanjinduo metal ore deposit is located in the Gangdise Nyainqentanglha fold system: (I) the Changning Meng Lian fold belt (II) Lincang Menghai folded beam (III) Lincang - Lancang complex anticline in southern. Regional strata exposed upper Proterozoic Lancang group and the Jurassic, Cretaceous and Quaternary; regional structure to compresso shear faults in North West, North East of Yanshan; magmatite in Indosinian granite, granite is distributed with quartz vein, quartz porphyry, granite porphyry, granite vein.

South gold deposit is located in a NNW - SSE trending Indosinian ah Meng rock and a certain size nanmu drought (F1) fault South west. Ore bodies occur in the East North in F2 fault fracture zone and North East, and F2 fault in North East of deflection of the Middle Jurassic huakaizuo lower segment of the first, the two layer. The useful component along the rock fracture, is rich in the output. The ore mainly stratoid, lenticular, the ore bearing rock is the fragmentation of silty mudstone, fault breccia. Ore body towards the North East and North West, North West tendency or southeast, angle changes greatly, which belongs to the steep inclined orebody.

The ore minerals are mainly natural gold; gangue minerals are mainly quartz and sericite, kaolinite twice as. Ore structure is mainly to the mud structure, micro scale like structure, time for the microcrystalline structure, occasionally fine sand structure, xenomorphic granular structure, colloidal structure, appearance structure, alteration of silt structure; ore structure to block like structure, time for the crusty structure, net veined structure, brecciated structure etc.. Useful components of ore, gold, followed by silver, silver is not up to the associated component index evaluation requirements; hazardous components of low content. Ore oxidation rate in 85% above, the natural types of ores are oxidized ore; industrial type belongs to micro grained gold ore. The genetic type of deposit is epithermal gold deposits controlled by structure.

Key words: nanhan; gold deposit; epithermal