| 吉林延边棉田金铜矿床成矿流体特征及矿床成因 |
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| 引用本文： | 吴涛涛,陈跃军,张宇峰,张勇,赵宏光,王长兵,刘永俊,朱怀亮,吴国学.吉林延边棉田金铜矿床成矿流体特征及矿床成因[J].世界地质,2013,32(1):15-23. |
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| 作者姓名： | 吴涛涛 陈跃军 张宇峰 张勇 赵宏光 王长兵 刘永俊 朱怀亮 吴国学 |
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| 作者单位： | 1． 吉林大学地球科学学院，长春130061; 2． 内蒙古自治区地质调查院，呼和浩特010020; 3． 武警黄金第一支队，黑龙江牡丹江157021; 4． 长春工程学院土木工程学院，长春120012 |
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| 基金项目： | 吉林省汪清县棉田-砂金沟一带金铜成矿规律及找矿预测研究 |
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| 摘 要： | 棉田金铜矿床是受断裂构造和中性侵入体联合控制的以金、铜为主的多金属矿床。笔者在对该区地质调查的基础上，运用红外光谱分析和显微测温技术对成矿流体进行研究，发现该区围岩蚀变以绢云母化和青磐岩化最为普遍，并将成矿阶段分为4 个阶段: 黄铁绢英岩阶段、石英--黄铁矿阶段、多金属硫化物阶段和石英--碳酸盐阶段; 对应的均一温度为320℃ ～ 360℃、280℃ ～ 320℃、200℃ ～ 280℃和200℃ ～ 240℃; 其中主成矿阶段为第二、三阶段，主成矿温度为200℃ ～ 320℃，这也是热液中水和二氧化碳含量最高的阶段。流体盐度为1. 91 ～ 13. 40 ( wt%，NaCl) ，密度为0. 69 ～ 0. 95 g /cm3，具低盐度和低密度的特点; 成矿深度为0. 8 ～ 1. 5 km，具浅层成矿的特点; 氢氧同位素分析， δ18OH2O的值为－ 4. 7 × 10 － 3 ～ 5. 83 × 10 － 3，δDH2O的值为－ 89 × 10 － 3 ～ － 124 × 10 － 3，说明成矿流体主要为岩浆水，含少量大气水。综合研究表明，棉田金铜矿床属于浅成中温岩浆热液型矿床。
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| 关 键 词： | 棉田金铜矿床 流体包裹体 红外光谱 矿床成因 |
Characteristics of ore-forming fluids and ore genesis of Miantian gold-copper deposit in Yanbian of Jilin Province |
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| WU Tao-tao,CHEN Yue-jun,ZHANG Yu-feng,ZHANG Yong,ZHAO Hong-guang,WANG Chang-bing,LIU Yong-jun,ZHU Huai-liang,WU Guo-xue.Characteristics of ore-forming fluids and ore genesis of Miantian gold-copper deposit in Yanbian of Jilin Province[J].World Geology,2013,32(1):15-23. |
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| Authors: | WU Tao-tao CHEN Yue-jun ZHANG Yu-feng ZHANG Yong ZHAO Hong-guang WANG Chang-bing LIU Yong-jun ZHU Huai-liang WU Guo-xue |
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| Institution: | 1． College of Earth Science，Jilin University，Changchun 130061，China; 2． Institute of Geological Survey of Inner Mongolia Autonomous Region，Huhhot 010020，China; 3． No. 1 Gold Geological Party of the Armed Police Force，Mudanjiang 157021，Heilongjiang，China; 4． Faculty of Civil Engineering，Changchun Institute of Technology，Changchun 130012，China |
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| Abstract: | Miantian gold-copper deposit is a gold-copper-based multi-metal deposit controlled by faults and neutral intrusions． On the basis of geological survey，we studied the ore-forming fluids by infrared spectroscopy and micro themometry． The results showed that the wall rock alteration was dominated by sericitization and propylitization， and the mineralization consisted of four stages，including the beresite stage，quartz-pyrite stage，polymetallic sulfides stage and quartz-carbonate stage。Correspondingly the homogenization temperatures were 320℃ ～ 360℃， 280℃ ～ 320℃，200℃ ～ 280℃ and 200℃ ～ 240℃，in which the second and third were the main mineralization stages，corresponding homogenization temperatures from 200℃ to 320℃) ． At the same time there were the highestcontents of H2O and CO2 in the main mineralization stages． Salinity of fluid varied between 1. 91% and 13. 40% ( wt%，Nacl) and density was 0. 69 ～ 0. 95 g /cm3，with obvious characteristics of low salinity and density． The main ore-forming depth was from 0. 8 km to 1. 5 km，which indicated the epizonal characteristics． Based on the compositional analytical results of fluid inclusions，the values of δ18OH2O and δDH2O were － 4. 7 × 10 － 3 ～ 5. 83 × 10 － 3 and － 89 × 10 － 3 ～ － 124 × 10 － 3，which illustrated that the ore-forming fluids mainly originated from magmatic hydrothermal along with a small amount of atmospheric water． Miantian gold-copper deposit belonged to medium temperature epizonal magmatic-hydrothermal deposit． |
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| Keywords: | Miantian gold-copper deposit fluid inclusions infrared spectrum genesis of deposit |
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