湖南大新金矿床地质特征及控矿因素分析

湖南大新金矿床产于震旦系含砾砂质板岩中,严格受断层控制。成矿可分为2个期次,即热液成矿期和表生期,其中热液成矿期为主成矿期。矿床属岩浆热液破碎蚀变岩型金矿床。地层、构造和岩浆岩是矿床重要的控矿因素。     

山西省金矿地质特征

阐明金矿成矿地层、岩浆岩、构造等地质条件．指出早元古界前和中生代燕山期以来两个重要成矿期．内生、变质、砂金、伴生金矿床类型均有．目前发现的金矿床类型以岩浆热液型和火山一次火山热液型为主；绿片岩含金石英脉-绢片岩型、含金硅铁岩型和变质砾岩型等变质热液型金矿点金矿化点已多处发现．五台山—恒山区是重要的金矿成矿区．     

加纳西南部阿曼弗如姆金矿床地质特征及成因分析

加纳西南部地区金矿床众多,成矿地质条件优越,是金矿找矿较为理想的地区。阿曼弗如姆金矿床位于加纳西南部赛夫维金成矿带中段,矿区内已圈定2条矿体,矿体呈脉状,产状、规模相对稳定,矿石类型主要为黄铁绢英岩型,围岩蚀变普遍发育,且具有多期、多阶段特征,蚀变叠加部位金品位较高。该矿床赋矿围岩为比里姆系变质安山岩,区域内频繁的岩浆活动为成矿热液的形成提供了充足的热能。NEE-近EW向断裂为控矿构造,是含矿热液运移和聚集的良好场所。初步分析认为,该矿床为中低温热液型金矿床。     

辽宁省三道河金矿床岩石学特征及成矿阶段分析

辽宁省三道河金矿床的矿石结构主要为它形—自形不等粒结构、溶蚀结构和碎裂结构。成矿类型为含金硫化物石英脉型和含金黄铁矿蚀变岩型。热液成矿期主要包含早期的粗粒黄铁矿—毒砂—石英成矿阶段,中期的石英—黄铁矿成矿阶段,晚期的石英—多金属硫化物成矿阶段;后期的阶段为石英、碳酸盐岩成矿阶段。     

蚀变岩型金矿床地质特征及找矿方向分析

在进行金矿床寻找过程中,岩矿型的金矿类型很多,其中蚀变岩型金矿床是金矿床类型中非常重要也很典型的一个成矿类型范例。蚀变岩型金矿床是一种后期热液参与影响岩石形成的金矿床。是含金热液通过容矿构造内沉淀沉积或围岩通过热(压)力作用热液与岩石发生反应元素的带入带出,近而,岩石发生蚀变岩,金这种有益元素富集形成矿床。蚀变岩型金矿床突出特征一般成矿规模比较大,矿石成分复杂,矿石品位变化幅度小,矿石蚀变清楚。这类矿床的形成不完全依赖于地层和地质年代,在不同区域内形成的矿床,相互间有着巨大的区别,我国很多地区都有这种类型的矿床。下面就来对蚀变岩型金矿床的质地特征及找矿方向进行一下分析。     

四川金木达—南木达金矿带地质特征及矿床成因分析

金木达—南木达金矿带大地构造位置属于松潘—甘孜地槽褶皱系,近年来在该矿带上已发现有金木达、南木达和代隆等诸多金矿床。通过总结矿带内典型金矿床地质特征、分析成矿因素,发现上三叠统新都桥组中金矿化明显富集,其为矿带的形成提供了初始矿源层;另外,本区岩浆岩和断裂亦是金成矿的重要控制因素。三叠纪以来本区构造演化、热液及矿质迁移特征反映出矿带内金矿床成因属于热液构造蚀变岩型。     

吉林延边五星山金矿床地质特征及矿床成因

五星山金矿床是位于延边地区的浅成低温热液金矿床,矿体产于碱长花岗岩、角闪安山岩、石英-黄铁矿脉和石英-方解石脉。研究表明,热液金矿化可分为黄铁矿-石英阶段,黄铜矿-方铅矿-闪锌矿-黄铁矿-石英阶段和石英-方解石阶段。流体包裹体研究表明,五星山金矿床主成矿阶段石英中发育气液二相流体包裹体;气液二相包裹体均一温度为134.6~324.7℃,盐度为1.16%~7.53%,密度0.73~0.94 g/cm3。包裹体岩相学、显微测温及氢、氧同位素综合研究结果表明,成矿流体为大气降水与岩浆热液混合流体。综合研究表明,五星山金矿床属浅成低温热液成因类型。     

甘肃寨上金矿床的矿石建造特征及成因

位于西秦岭礼(县)—岷(县)成矿带西段的寨上金矿床,是近年发现的1个大型微细浸染型金矿。寨上金矿床的矿石建造可分为氧化矿石和原生矿石两大自然类型。其中原生矿石建造又可分为6种:碎裂岩型、碎裂岩化碳质板岩型、碎裂岩化粉砂质及泥质板岩型、碎裂岩化灰岩型、钙质板岩型和强硅化蚀变角砾岩型。根据热液矿脉中矿物特点,可将矿石中矿物共生组合分为少硫化物—石英类、含As黄铁矿—毒砂—石英类、多金属硫化物—石英—白钨矿—方解石类和少硫化物—碲化物—碳酸盐类。在矿床形成过程中,深源热液参与可能对金的活化迁移起到重要作用,构造体制转换使流体稳定体系发生改变而造成金的富集成矿。矿床成因属于中低温热液矿床。     

新疆东准噶尔金山沟金矿区火山岩地球化学特征及成矿模式研究

金山沟金矿床是新疆典型的陆相火山岩型金矿床之一,赋存于一套以粗面安山岩和玄武质粗面安山岩为主的早石炭世火山岩中,对火山岩的构造地质背景的研究是重建地质过程的关键。对矿区火山岩进行岩石地球化学特征和成矿物质来源、成矿温度等方面的研究和总结,进而探讨火山岩形成的构造环境与金矿床的成矿模式。地球化学特征表明,大多数火山岩的化学成分从钙碱性、高钾钙碱性变化到钾玄岩系列,属于富钠钙碱性安山质火山岩类,属于大陆边缘弧环境。同位素207Pb/204Pb的值与上地幔一致,S同位素也表明矿区火山岩为幔源岩,结合区域地质资料,认为金山沟金矿区出露的火山岩可能属于造山伸展期大陆边缘火山作用下的产物。包裹体测温数据和C、H同位素表明,金山沟金矿床成因类型为中低温浅成热液型金矿床。在以上研究基础上,结合成矿过程,将该矿床成矿模式总结为"两阶段三期次"的"两层楼式"。     

辽宁省北票市娄家店金矿床地质特征及控矿因素

娄家店金矿床位于辽西凌源—北票金成矿带北东部,矿区内已发现5条金矿脉,均严格受断裂构造控制,矿石类型为含金石英脉型和蚀变岩型,硅化、黄铁矿化围岩蚀变与金成矿关系密切,成矿阶段可划分为3个阶段,其中石英-多金属硫化物阶段为主要成矿阶段。综合分析表明,娄家店金矿床为受太古宇建平群小塔子沟组地层、燕山期二长花岗岩及鸡冠山断裂次级断裂控制的复合成因热液型金矿床。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.