【作者】 刘猛；

【导师】 张招崇； 丁汝福；

【作者基本信息】 中国地质大学(北京) ， 矿产普查与勘探， 2012， 硕士

【摘要】 阿克塔斯铜金矿位于新疆阿勒泰地区富蕴县，大地构造处于西伯利亚板块和准噶尔板块的交汇部位，中部为额尔齐斯大断裂，矿区靠近准噶尔一侧，地处准噶尔板块东北缘加波萨尔晚古生代岛弧带内，成矿地质条件优越。通过野外地质调查、岩相和矿相观察、岩石主微量、稀土元素分析及原生晕、钻孔样品加工分析测试等，圈出3条矿化蚀变带，分别编号为Ⅰ、Ⅱ、Ⅲ号矿化蚀变带，其中Ⅰ号蚀变带地表可见自然金，多处槽探和钻孔内可见到金矿化；Ⅱ号蚀变带见孔雀石化、绿帘石化、绿泥石化；Ⅲ号蚀变带为沿北西向的绿帘石化、硅化、碳酸盐化蚀变带，其中在多处见到孔雀石化及少量的黄铜矿等金属硫化物。金富集部位为Ⅰ号蚀变带石英脉、斜长花岗岩和千枚岩的接触带中，铜主要存在于硅化的火山角砾岩中，岩石发生强烈的绢云母化、绿帘石化、绿泥石化、硅化、碳酸盐化等蚀变，矿石原生矿物主要为黄铁矿、黄铜矿、磁铁矿等，见少量的自然金。矿区地球物理异常具有低磁性，高极化率、低电阻率；阿克塔斯岩石主量元素为过铝质高钾钙碱性系列，微量元素蛛网图呈平缓右倾的“W”型，均相对富集Ba、U、K、Pb、Sr，相对亏损Nd、Ti，表明为有地壳物质的加入。成矿温度在260°—350°之间，成矿流体的成分中富含Na⁺、Ca²⁺、Mg²⁺、等，贫CH₄、H2；硫同位素测试结果显示其可能来源于地幔；成矿流体是以岩浆水为主，混有少量大气降水的低盐度、低密度、中偏弱酸性溶液；成矿过程大致可分为两个成矿期、四个成矿阶段。通过矿区岩石的地球化学特征和控矿构造，初步认为铜金矿的成因类型为受韧性剪切构造破碎及蚀变控制的火山热液型矿床。根据阿克塔斯铜金矿的控矿地质因素、地球物理和地球化学异常特征，建立阿克塔斯铜金矿的地质—地球物理—地球化学综合找矿模式对该区及邻近相似地区的找矿工作具有重要的示范指导意义。更多还原

【Abstract】 The Ake Tasi gold and copper mine is located in Fuyun county of XinJiang.It is teconically located in the boundary Siberian plate and Junggarplate;Eerqisi majordislocation is located in central,the mine is close to the Jungger.It located in the Junggar plate northeastern margin of the Olongapo Saar late Paleozoic island zone.It is geological conditions.By field geological inestigation and indoor research,combined with previous researchwork,the author began his work.Through field geologicalobservations,profile measurement system,sample collection,petrology and ore graphy,,hydrogenand oxygen isotopic test,sulfur isotopic test,and maine,rare earth trace elementstest and so on.Three mineralized alteration zonesⅠ,Ⅱand Ⅲ alteration zones have been found through grological mapping and trenching.Rusty gold and goldmineralization have been intrenches of NO. Ⅰ alteration zone.Malachite mineralization,epidotization and chloritization can be found in NO. Ⅱ alteration zone.There has malachite and chalcopyrite inthe No. Ⅲ alteration,whtich is silication,carbonatization.Gold is in the quartz veins,plagioclase granite and phyllite contact zone of NO. Ⅰ alteration zone.Copper is mainly found in the silicified volcanic breccia,occurrence of strong sericite rock,biotite,silicification and otheralteration.Native metals mainly are chalcopyrite,pyrite,specularite and few rusty gold.The physical abnormalities of mining area belongs to aluminum-K calc-alkaline series;it’s spider diagram showed a moderate right-wing“W”type,relativelyenriched in Ba、U、K、Pb、Sr,and relative lossed of Nd、Ti;the low of Nd,Ti is showed to mix to crustal material.Ore-forming temperatureis between260°-350°,the composition of the ore-forming fluid is rich in Na⁺,Ca²⁺,Mg²⁺,depletedCH₄,H2.The results of sulfur isotope test show that it may be derived form the mantle.Ore-forming fluids is mainly magmatic water,mixed with few precipitation,which is low salinity, low density, weak acidic.Ore-formation process canbe divided into two ore-forming stage,four mineralization stages stage; By thegeochemical characteristics of mine rockand structures,the copper-gold of genetic due to the type of the ductile shear the fracture controlled as a subvolcanichydrothermal deposits.Under geological factors,geophysical,geochemical anomaly characteristicsand metallogenic model of AkeTAsi goldg and copper,establish geological-geo physical-geochemical prospecting model,has an im portent demonstration of guiding significance.更多还原