新疆阿尔泰铁木尔特铅锌矿床稳定同位素组成特征  

Stable isotope characteristics of Tiemurte Pb-Zn deposit in Altay,Xinjiang

作　　者：耿新霞[1] 杨富全[1] 杨建民[1] 郭正林 郭旭吉 黄承科 刘锋[1] 柴凤梅[3] 张志欣[1] 

机构地区：[1]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京100037 [2]新疆维吾尔自治区有色地勘局706地质队,新疆阿勒泰836500 [3]新疆大学地质与勘查工程学院,新疆乌鲁木齐830046

出　　处：《矿床地质》2010年第6期1088-1100,共13页Mineral Deposits

基　　金：国家重点基础研究发展计划项目(编号2007CB411302);中央级公益性科研院所基本科研业务费专项资金项目(编号:K0924);国家科技支撑计划重点项目(编号:2006BAB07B02-05;2006BAB07B07-02);国土资源大调查项目(编号:1212010786006)共同资助

摘　　要：新疆阿尔泰山南缘克兰盆地中的铁木尔特中型铅锌矿床赋存于上志留统—下泥盆统康布铁堡组上亚组第二岩性段,容矿岩石为大理岩、绿泥石英片岩、变钙质粉砂岩、矽卡岩。矿床经历了喷流沉积期、叠加改造期和表生期。喷流沉积期硫化物δ34S值集中于-27.8‰～-16.0‰,峰值为-26.0‰,少量1.7‰～3.4‰,表明硫主要来自细菌还原海水硫酸盐及岩浆活动。氢、氧同位素组成表明,叠加改造期石英和方解石的δD变化于-122‰～-61‰,δ18O变化于9.5‰～10.9‰,δ18O水为-5.8‰～4.8‰,表明叠加改造期成矿流体具有多来源特征,是岩浆水、大气降水和变质水的混合产物。铁木尔特铅锌矿床在成因类型上为VMS型,矿床形成后又经历了叠加改造。Lying in Kelang basin on the southern margin of Altay,the Tiemurte medium-size lead-zinc deposit occurs in 2nd lithological member of Upper Silurian-Lower Devonian Kangbutiebao Formation,with the host rocks being marble,chlorite quartz schist,calcareous argillaceous siltstone and skarn.The ore deposit has experienced three evolutionary periods,i.e.,sedimentary exhalative period,superposed reforming period and hypergenic period.The δ34S values of the sedimentary exhalative period range mainly from-27.8‰ to-16.0‰ with the peak value being-26.0‰ and a few values varying from 1.7‰ to 3.4‰,suggesting that the ore-forming fluid was mainly derived from the mixed fluid of meteoric water and magmatic water.In the sedimentary exhalative period,δD values of quartz and calcite are from-122‰ to-61‰,δ18O values change from 9.5‰ to 10.9‰,and δ18OH2O values vary from-5.8‰ to 4.8‰,implying that the ore-forming fluid was probably the mixture of magmatic water,meteoric water and metamorphic water.The Tiemurte lead-zinc deposit belongs to VMS type subjected to superposed reformation.

关 键 词：地球化学 铅锌矿 稳定同位素 成矿机制 铁木尔特 阿尔泰 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]