| 内蒙古维拉斯托铅锌矿床流体包裹体特征及矿床成因研究 |
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| 引用本文： | 权鸿雁,蔡文艳,张雪冰,付丽娟,王可勇.内蒙古维拉斯托铅锌矿床流体包裹体特征及矿床成因研究[J].世界地质,2017,36(1):105-117. |
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| 作者姓名： | 权鸿雁 蔡文艳 张雪冰 付丽娟 王可勇 |
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| 作者单位： | 1. 吉林大学 地球科学学院, 长春 130061;
2. 内蒙古山金地质矿产勘查有限公司, 内蒙古 赤峰 024000 |
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| 摘 要： | 维拉斯托铅锌矿床发育在大兴安岭南段西坡成矿带内。矿区出露的岩浆岩主要为石英闪长岩、花岗闪长岩以及碱性花岗岩等;矿体严格受断裂构造控制,属典型的热液脉型矿床。矿床的热液期可划分为3个阶段:Ⅰ石英-毒砂-黄铁矿阶段、Ⅱ多金属硫化物-石英阶段和Ⅲ石英-碳酸盐阶段。流体包裹体研究表明,维拉斯托矿床矿石主要发育气液两相、富CH_4以及含CH_4-CO_2的包裹体。Ⅰ阶段3种类型包裹体均发育,Ⅱ阶段以气液两相和含CH_4-CO_2的包裹体为主,Ⅲ阶段仅发育气液两相包裹体。Ⅰ阶段包裹体均一温度范围为243.1℃~398.5℃,盐度为4.8%~12%NaCleqv;Ⅱ阶段均一温度为190.0℃~331.1℃,盐度为3.5%~9.1%NaCleqv;Ⅲ阶段均一温度范围为180.0℃~240.0℃,盐度范围为3.7%~6.7%NaCleqv,显示成矿流体具有中温、低盐度和低密度的特点;激光拉曼光谱分析包裹体气相成分主要为CO_2、CH_4和H_2O。氢、氧同位素分析结果表明成矿流体具有岩浆水和大气降水的混合特征;硫同位素结果显示成矿物质具有深源的特点。综合分析认为,矿床的形成与燕山期中酸性岩浆活动密切相关,深部岩浆在上升过程中与下渗的大气降水发生混合,导致矿物质在近东西向的"S"型压扭性断裂中沉淀并富集成矿。
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| 关 键 词： | 流体包裹体 稳定同位素 维拉斯托 大兴安岭 |
| 收稿时间： | 2016-06-24 |
| 修稿时间： | 2017-01-03 |
Characteristics of fluid inclusions and genesis of Weilasituo Pb-Zn deposit,Inner Mongolia |
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| QUAN Hong-yan,CAI Wen-yan,ZHANG Xue-bing,FU Li-juan,WANG Ke-yong.Characteristics of fluid inclusions and genesis of Weilasituo Pb-Zn deposit,Inner Mongolia[J].World Geology,2017,36(1):105-117. |
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| Authors: | QUAN Hong-yan CAI Wen-yan ZHANG Xue-bing FU Li-juan WANG Ke-yong |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Inner Mongolia Shandong Gold Geological Minerals Survey Co., Ltd, Chifeng 024000, Inner Mongolia, China |
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| Abstract: | The Weilasituo deposit is mainly hosted in southern Great Hinggan Mountain metallogenic belt. The intrusive rocks exposed in the study area are mainly quartz diorite, granodiorite and alkali granite.Ore bodies are strictly controlled by fracture structures, which is an important character of the hydrothermal vein type lead-zinc deposit.The mineralization can be divided into Ⅰ, Ⅱ,Ⅲ stages, characterized by assemblages of quartz-arsenopyrite-pyrite, quartz-polymetallic sulfide and quartz-carbonate, respectively. Systematic study on fluid inclusions reveals that there existed three types of primary fluid inclusions in the ores, which were two-phase aqueous, CH4 rich and CH4-CO2 bearing fluid inclusions. All the three types of fluid inclusions were developed in stage Ⅰ. The primary fluid inclusions in stage Ⅱ were mainly composed of two-phase aqueous and CH4-CO2 bearing fluid inclusions, while only two-phase aqueous fluid inclusions were developed in stage Ⅲ. Homogenization temperatures of fluid inclusions in stage I ranged from 243.1℃ to 398.5℃, with salinities of 4.8%~12% NaCleqv. For stage Ⅱ, homogenization temperatures decreased to 190.0℃~331.1℃, salinities changed to 3.5%~9.1% NaCleqv, whereas for stage Ⅲ homogenization temperature was 180.0℃~240.0℃, with salinities of 3.7%~6.7% NaCleqv, indicating intermediate temperate and low salinity mineralizing liquids. The analytic results from Laser Laman Spectroscopy suggest that the gas phases are rich in CH4, CO2 and H2O. The analytic results from H and O isotope indicate that the mineralizing fluids were derived from magmatic water mixing with meteoric water. The study of S isotope implies that the ore forming materials were from a deep source. Combining all the analytical results and regional setting, it is concluded that Weilasituo deposit was related to the Yanshanian magmatism, and was formed by the precipitation of mineralizing materials in the west-east trending "S" shape compression fault during the mixing of magmatic water and meteoric water. |
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| Keywords: | fluid inclusion stable isotope Weilasituo Great Hinggan Mountain |
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