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| 大兴安岭北部小伊诺盖沟金矿床流体包裹体特征及地质意义 | |
| 引用本文： | 武广,陈衍景,糜梅,朱明田,刘军.大兴安岭北部小伊诺盖沟金矿床流体包裹体特征及地质意义[J].大地构造与成矿学,2008,32(2):185-194. |
| 作者姓名： | 武广 陈衍景 糜梅 朱明田 刘军 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,广东,广州,510640 2. 中国科学院广州地球化学研究所,广东,广州,510640;北京大学造山带与地壳演化实验室,北京,100871 3. 中国科学院广州地球化学研究所,广东,广州,510640;中国科学院研究生院,北京,100049 |
| 基金项目： | 国家自然科学基金，中国博士后科学基金，国家科技支撑计划 |
| 摘 要： | 小伊诺盖沟金矿床位于大兴安岭北部额尔古纳地块,其地质、地球化学特征与产于大兴安岭中生代火山岩地区的浅成低温热液型金矿床具有明显区别。本文通过矿床流体包裹体岩相学、显微测温学和包裹体激光拉曼光谱分析研究成矿流体性质,探讨矿床成因类型。研究结果表明,流体包裹体有气液两相、含CO2三相和纯CO2包裹体3种类型。气相成分以CO2为主,其次是H2O,总体属NaCl-H2O-CO2体系;流体包裹体的盐度低,介于2.1%~8.5% NaCl eqv之间;包裹体均一温度介于169~493℃之间,平均为295℃,属中温热液矿床。其成矿压力为38~172MPa,平均93MPa,对应的成矿深度为4~11km,平均8km。小伊诺盖沟金矿床的地质-地球化学特征与世界造山型金矿类似,应属造山型金矿,其形成于蒙古-中朝板块与西伯利亚板块之间的陆-陆碰撞造山环境。 |
| 关 键 词： | 流体包裹体 矿床成因 造山型金矿 小伊诺盖沟金矿 大兴安岭北部 |
| 文章编号： | 1001-1552(2008)02-0185-10 |
| 修稿时间： | 2007年7月9日 |
FLUID INCLUSION CHARACTERISTICS OF THE XIAOYINUOGAIGOU GOLD DEPOSIT IN NORTHERN DA HINGGAN MOUNTAINS AND ITS GEOLOGICAL SIGNIFICANCE |
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| WU Guang,CHEN Yanjing,MI Mei,ZHU Mingtian,LIU Jun.FLUID INCLUSION CHARACTERISTICS OF THE XIAOYINUOGAIGOU GOLD DEPOSIT IN NORTHERN DA HINGGAN MOUNTAINS AND ITS GEOLOGICAL SIGNIFICANCE[J].Geotectonica et Metallogenia,2008,32(2):185-194. | |
| Authors: | WU Guang CHEN Yanjing MI Mei ZHU Mingtian LIU Jun |
| Abstract: | The Xiaoyinuogaigou gold deposit is located in the Erguna massif of the northern Da Hinggan Mountains. Its geologial and geochemical characteristics are obviously different from those of epithermal gold deposits which occur in the Da Hinggan Mountain Mesozoic volcanic rock area. On the basis of the results from the inclusion petrofacies, micro-thermometry and laser Raman spectrographic analysis, the ore-forming fluid character is systematically studied, and the origin of the Xiaoyinuogaigou gold deposit is discussed. The results show that there are three types of fluid inclusions in quartz crystals, i.e., aqueous two-phase, CO2-bearing three-phase and pure CO2 types. The bubbles (vapor-phase) are mainly composed of CO2 and H2O. The ore-forming fluid belongs to NaCl-H2O-CO2 system, which is characterized by low salinity (2.1%~8.5% NaCl eqv). The homogenization temperature of fluid inclusions ranges from 169℃ to 493℃ (averagely 295℃), belonging to the mesothermal type. The ore-forming pressure is 38~172MPa with average of 93MPa, corresponding to the depth ranging from 4 to 11km (averagely 8km), and the pressure fluctuation may be due to faulting. The geological and geochemical features of the deposit are similar to those of orogenic gold deposits worldwide, and can hence be assigned to the orogenic type. The origin of deposit may be related to Mesozoic collisional orogeny between the Siberia and Mongolia-Sinokorea continents. |
| Keywords: | fluid inclusion origin of the deposit orogenic gold deposit Xiaoyinuogaigou gold deposit northern Da Hinggan Mountains |
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