| 华北克拉通南缘小秦岭矿集区灵湖金矿床成因:流体包裹体和H-O、S-Pb同位素证据 |
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| 引用本文： | 李铁刚,武 广,陈公正,吴 昊,王国瑞,杨 飞,李英雷.华北克拉通南缘小秦岭矿集区灵湖金矿床成因:流体包裹体和H-O、S-Pb同位素证据[J].延边大学理工学报,2020,0(5):569-583. |
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| 作者姓名： | 李铁刚 武 广 陈公正 吴 昊 王国瑞 杨 飞 李英雷 |
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| 作者单位： | 1. 中国地质科学院矿产资源研究所 自然资源部成矿作用与资源评价重点实验室,北京 100037; 2. 中国人民武警黄金第四支队,辽宁 辽阳 111000; 3. 万宝矿产有限公司,北京 100053 |
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| 摘 要： | 灵湖金矿床位于华北克拉通南缘的小秦岭地区,矿体大多呈脉状产于断裂带内。成矿过程可初步划分为石英-黄铁矿、石英-多金属硫化物和石英-碳酸盐-黄铁矿3个阶段。Au主要沉淀于石英-多金属硫化物阶段。成矿期石英中发育富液两相、富气两相和H2O-CO2三相包裹体。石英-黄铁矿阶段发育富液两相包裹体,其完全均一温度为424 ℃～499 ℃,盐度为11.5%～13.6% NaCleq,密度为0.55～0.66 g·cm-3; 石英-多金属硫化物阶段发育富气两相、富液两相和H2O-CO2三相包裹体,其完全均一温度为291 ℃～389 ℃,盐度为0.4%～11.8% NaCleq,密度为0.50～0.83 g·cm-3; 石英-碳酸盐-黄铁矿阶段可见富液两相和富气两相包裹体,其完全均一温度为206 ℃～289 ℃,盐度为8.3%～22.2% NaCleq,密度为0.83～0.99 g·cm-3。成矿流体具有高温、中低盐度和低密度等特征。灵湖金矿床中石英的δ18OH2O值为0.7‰～4.5‰,δD值为-106.4‰～-86.1‰。H-O同位素分析结果表明,成矿流体主要来源于岩浆水。矿石硫化物的δ34S值为-8.5‰～2.4‰,206Pb/204Pb值为17.202～17.796,207Pb/204Pb值为15.448～15.473,208Pb/204Pb值为37.712～38.255。S-Pb同位素分析结果表明,成矿物质主要来源于低级下地壳部分熔融形成的花岗质岩浆。灵湖金矿床为岩浆热液型金矿,流体相分离和温度的降低是导致矿质沉淀的主要机制。
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| 关 键 词： | 流体包裹体 H-O同位素 S-Pb同位素 成矿流体 金矿床 小秦岭矿集区 华北克拉通南缘 |
Genesis of Linghu Gold Deposit in Xiaoqinling Ore District,the Southern Margin of North China Craton,China: Evidence from Fluid Inclusions,H-O and S-Pb Isotopic Compositions |
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| LI Tie-gang,WU Guang,CHEN Gong-zheng,WU Hao,WANG Guo-rui,YANG Fei,LI Ying-lei.Genesis of Linghu Gold Deposit in Xiaoqinling Ore District,the Southern Margin of North China Craton,China: Evidence from Fluid Inclusions,H-O and S-Pb Isotopic Compositions[J].Journal of Yanbian University (Natural Science),2020,0(5):569-583. |
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| Authors: | LI Tie-gang WU Guang CHEN Gong-zheng WU Hao WANG Guo-rui YANG Fei LI Ying-lei |
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| Affiliation: | 1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. No.4 Gold Geological Party of Chinese People’s Armed Police Force, Liaoyang 111000, Liaoning, China; 3. Wanbao Mining Ltd., Beijing 100053, China |
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| Abstract: | Linghu gold deposit is located at Xiaoqinling area in the southern margin of North China Craton. Ore bodies occur as veins in the fault zones. The ore-forming process can be divided into three stages, including quartz-pyrite stage, quartz-polymetallic sulfide stage and quartz-carbonate-pyrite stage. Quartz-polymetallic sulfide stage is the main mineralization stage, and gold mainly precipitates in this stage. Three types of fluid inclusions are distinguished in various quartz veins, including liquid-rich, gas-rich and H2O-CO2 inclusions. The fluid inclusions in the quartz of quartz-pyrite stage are liquid-rich; the homogenization temperatures, salinities, and densities are 424 ℃-499 ℃, 11.5%-13.6% NaCleq, and 0.55-0.66 g·cm-3, respectively. The fluid inclusions in the quartz of quartz-polymetallic sulfide stage consist of liquid-rich, gas-rich and H2O-CO2; the homogenization temperatures, salinities, and densities are 291 ℃-389 ℃, 0.4%-11.8% NaCleq, and 0.50-0.83 g·cm-3, respectively. There are liquid-rich and gas-rich inclusions in the quartz of quartz-carbonate-pyrite stage; the homogenization temperatures, salinities, and densities are 206 ℃-289 ℃, 8.3%-22.2% NaCleq, and 0.83-0.99 g·cm-3, respectively. The ore-forming fluids of Linghu gold deposit are generally characterized by high temperature, moderate-low salinity, and low density. The δ18OH2O values calculated for ore-bearing quartz range from 0.7‰ to 4.5‰, and the δD values from bulk extraction of fluid inclusion water range from -106.4‰ to -86.1‰, suggesting that the ore-forming fluid consists dominantly of magmatic water. The δ34S values range from -8.5‰ to 2.4‰, and the 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb ratios of ore sulfides are in the ranges of 17.202-17.796, 15.448-15.473, and 37.712-38.255, respectively. The analysis results of S-Pb isotope indicate that the ore-forming materials mainly come from the granitic magma formed from partial melting of the lower lower-crust. Linghu gold deposit is a magmatic-hyrothermal gold deposit; fluid phase separation and temperature decrease are the dominant mechanisms for the deposition of ore-forming materials. |
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| Keywords: | fluid inclusion H-O isotope S-Pb isotope ore-forming fluid gold deposit Xiaoqinling ore district the southern margin of North China Craton |
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