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| 内蒙古拜仁达坝银多金属矿矿床地质及成矿流体特征 | |
| 引用本文： | 郭利军,谢玉玲,侯增谦,王 硕,陈 伟,李 政,李应栩,薛怀民,童 英,潘小菲,周喜文.内蒙古拜仁达坝银多金属矿矿床地质及成矿流体特征[J].岩石矿物学杂志,2009,28(1):26-36. |
| 作者姓名： | 郭利军 谢玉玲 侯增谦 王 硕 陈 伟 李 政 李应栩 薛怀民 童 英 潘小菲 周喜文 |
| 作者单位： | 1. 内蒙古地质勘查有限责任公司,内蒙古,呼和浩特,010020 2. 北京科技大学,土木与环境工程学院,北京,100083 3. 中国地质科学院,地质研究所,北京,100037 |
| 基金项目： | 国家自然科学基金，内蒙古地质勘查有限责任公司资助项目 |
| 摘 要： | 内蒙古拜仁达坝矿区位于大兴安岭西坡银多金属成矿带,矿体产于元古宇宝音图组下岩段黑云斜长片麻岩和华力西期石英闪长岩中.根据野外脉体穿插关系和矿石结构构造特征可以将成矿分为3个阶段:石英多金属硫化物阶段、萤石-水白云母阶段、方解石-硫化物阶段.岩矿相、扫描电镜和能谱分析表明,矿区主要金属矿物有黄铁矿、白铁矿、磁黄铁矿、闪锌矿、方铅矿、毒砂、黄铜矿、硫锑铅矿等;脉石矿物以石英、方解石和萤石为主.在野外调研基础上,对主要脉石矿物石英、萤石中流体包裹体进行了包裹体岩相学、显微测温分析和包裹体中气液相成分的LRM分析.结果表明,第1阶段石英中包裹体以富CH4包裹体和纯CH4包裹体为主,第2阶段萤石中以富水包裹体为主,流体包裹体均一温度分别为187～343℃(石英)和152～306℃(萤石),据冰点估算的盐度分别为1.4%～9.34% NaCleq(质量分数,下同)和2.9%～9.2% NaCleq.包裹体气液相成分的LRM分析表明,石英中纯CH4包裹体显示较强的CH4峰(2 913～2 917 cm-1),部分样品中检出含一定量的CO2,富CH4包裹体气泡相中也显示了CH4峰的存在.萤石中富H2O包裹体气液相中均只检出H2O.结合矿床地质、区域矿床分布特征和包裹体显微测温结果,认为该矿床为一与燕山期岩浆活动有关的中低温热液矿床,成矿物质以深源为主. |
| 关 键 词： | 流体包裹体 银多金属矿 拜仁达坝 |
Geology and ore fluid characteristics of the Bairendaba silver polymetallic deposit in Inner Mongolia |
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| GUO Li-Jun,XIE Yu-ling,HOU Zeng-qian,WANG Shuo,CHEN Wei,LI Zheng,LI Ying-xu,XUE Huai-min,TONG Ying,PAN Xiao-fei and ZHOU Xi-wen.Geology and ore fluid characteristics of the Bairendaba silver polymetallic deposit in Inner Mongolia[J].Acta Petrologica Et Mineralogica,2009,28(1):26-36. | |
| Authors: | GUO Li-Jun XIE Yu-ling HOU Zeng-qian WANG Shuo CHEN Wei LI Zheng LI Ying-xu XUE Huai-min TONG Ying PAN Xiao-fei and ZHOU Xi-wen |
| Institution: | Inner Mongolia Geological Exploration Co. Ltd, Hohhot 010020, China;School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Inner Mongolia Geological Exploration Co. Ltd, Hohhot 010020, China;School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;;School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;;School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
| Abstract: | The Bairendaba silver-polymetallic deposit is located in Keshiketeng County of Inner Mongolia, China. The region is an important part of the metallogenic belt on the western slopes of the southern Da Hingan Mountains. Proterozoic biotite plagiogneiss (Baoyintu Formation) and Variscan quartz diorite outcrop in the district. Based on vein cross-cutting relationships and ore structure, three mineralization stages can be recognized. These comprise: quartz-polymetallic sulfide stage, fluorite-hydromuscovite stage and calcite-sulfide stage. Arsenopyrite, pyrite, chalcopyrite, marcasite, pyrrhotite, sphalerite, galena and boulangerite are the main metal minerals, while the gangue minerals are dominated by quartz, fluorite and calcite. Petrographic, microthermometric and LRM (Laser Raman Microprobe) results of fluid inclusions in quartz from stage 1 and fluorite from stage 2, show that from stages 1 to 2, the ore-forming fluids pass from high-moderate temperature, CH4-rich fluid to low temperature water-rich fluids. The salinity of the ore-forming fluids is low salinity. Pure CH4-fluid inclusions were found in quartz from stage 1, but not in fluorite from stage 2. Integrating data on ore geology, regional mineralization background, distribution of mineral deposits and fluid inclusion results, it is concluded that the Bairendaba silver-polymetallic deposit is a Yanshanian magmatism-related, structure-controlled and moderate-low temperature hydrothermal system. Sulfur isotope composition suggests a deep source for ore-forming material. |
| Keywords: | fluid inclusion silver polymetallic deposit Bairendaba |
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