辽宁白云金矿床成矿流体特征、成矿物质来源及成因研究

发布时间：2018-05-11 23:40

  本文选题：白云金矿 + 流体包裹体　； 参考：《矿物岩石》2017年01期

【摘要】：辽宁白云金矿是辽东-吉南裂谷带内典型的大型金矿床,其成矿作用复杂,为了深入揭示其成矿流体、成矿物质来源及成矿模式特征,针对白云金矿石进行流体包裹体、H,O,S及与成矿有关的岩体的研究,结果显示:5块金矿石流体包裹体的均一温度范围为152℃~370℃,主要分布在240℃~310℃,激光拉曼成分主要为CO_2和CH_4,有少量H_2O,极少数有N_2;5块金矿石δ~(34)S值为-8.5‰~+1.6‰(平均为-4.85‰),赋矿围岩(黑云片岩、变粒岩)中δ~(34)S值为+10.0‰~+17.0‰(平均为+14.57‰),地层大理岩的δ~(34)S值为-0.5‰~+13.2‰(平均为+7.17‰);5块金矿石石英中δ~(18)O为8.0‰~15.5‰,δD为-96.3‰~-73.6‰;与成矿有关的新岭岩体SHRIMP U-Pb年龄为217.6Ma±2.2Ma。流体包裹体特征表明:成矿流体为中温低盐度低密度的水盐流体,属于含N_2的H_2O-CO_2-CH_4-NaCl体系。流体中CO_2及CH_4形成与大理岩有关,极少数的N_2含量可能与大气水有关。氢氧同位素结果显示,成矿热液主要来源于深部岩浆水,后期混有部分大气降水。硫同位素特征表明,成矿物质可能主要来自岩浆热液。综上,白云金矿床的主成矿期为印支期,白云金矿床属于岩浆热液型金矿。
[Abstract]:Baiyun gold deposit in Liaoning Province is a typical large gold deposit in the Liaodong-South Jilin rift zone, and its mineralization process is complex. In order to reveal the ore-forming fluid, the source of ore-forming material and the characteristics of metallogenic model, the ore-forming fluid, ore-forming source and metallogenic model are studied. The fluid inclusions of dolomitic gold ore and the ore-forming related rock masses are studied. The results show that the homogeneous temperature range of fluid inclusions is 152 鈩，

本文编号：1876189