| 河南新县大银尖钼矿床流体包裹体研究 |
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| 引用本文： | 李红超,徐兆文,陆现彩,王旭东,陈伟,翟东兴.河南新县大银尖钼矿床流体包裹体研究[J].高校地质学报,2010,16(2):236-246. |
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| 作者姓名： | 李红超 徐兆文 陆现彩 王旭东 陈伟 翟东兴 |
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| 作者单位： | 1. 内生金属矿床成矿机制研究国家重点实验室（南京大学）；南京大学 地球科学与工程学院，南京 210093； ;
2. 河南有色地质矿产有限公司，郑州 450016 |
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| 基金项目： | 国家自然科学基金，国家基础研究与发展规划973项目 |
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| 摘 要： | 大银尖钼矿床是大别钼多金属成矿带近期取得较大勘查进展的一个重要矿床,成因上与燕山晚期大银尖二长花岗岩有关。通过对主成矿期矿化石英脉流体包裹体岩相学观察和显微测温,将捕获的流体包裹体分为4类,富液相的两相水溶液包裹体、富气相的两相水溶液包裹体、含子矿物三相水溶液包裹体和含CO2的三相水溶液包裹体。数据分析显示,均一温度的峰值分别出现于280～320℃和200～220℃,盐度的峰值处于5.11%～9.98%(NaCleq)低盐度区间和36.06%～42.78%(NaCleq)的高盐度区间。密度为0.91～1.10g/cm3。激光拉曼光谱分析表明,石英中流体包裹体的组分以水蒸汽为主,伴有少量的CO2和微量N2。H和O同位素具有典型的氧同位素漂移特征,指示岩浆热液和大气降水混合作用的发生。研究结果表明,大银尖钼矿床总体上属中高温浅成热液矿床,流体混合作用可能是矿床形成的主要机制。
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| 关 键 词： | 流体包裹体 显微测温 激光拉曼光谱 H O同位素 大银尖钼矿 大别造山带 |
| 修稿时间： | 2010-03-22 |
Study on Fluid Inclusions of the Dayinjian Mo Deposit in Xinxian County, Henan Province, China |
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| LI Hong-chao,XU Zhao-wen,LU Xian-cai,WANG Xu-dong,CHEN Wei,ZHAI Dong-xing.Study on Fluid Inclusions of the Dayinjian Mo Deposit in Xinxian County, Henan Province, China[J].Geological Journal of China Universities,2010,16(2):236-246. |
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| Authors: | LI Hong-chao XU Zhao-wen LU Xian-cai WANG Xu-dong CHEN Wei ZHAI Dong-xing |
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| Institution: | 1. State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China; 2. Henan Nonferrous Metals Geology and Mineral Resources Co. Ltd, Zhengzhou 450016, China |
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| Abstract: | The Dayinjian Mo deposit, as an important deposit in the Dabieshan Mo-polymetallic belt, has genetic links to monzogranite intrusion of Late Yanshanian, and has attracted extensive attention for great progress in recent exploration. Based on the petrography and microthermometry of fluid inclusions in the quartz veins formed in main mineralization stage, 4 types of primary fluid inclusions were identified, including: (1) aqueous-rich two-phase inclusions (L-type), (2) vapor-rich two-phase inclusions (V-type), (3) daughter mineral-bearing three-phase inclusion (S-type) and (4) CO2-bearing three-phase inclusions (C-type), The analysis results indicate that two main homogenization temperatures present at 280~320 ℃ and 200~220 ℃, respectively, while the salinities range in two intervals of 5.11%~9.98% (NaCleq) and 36.06%~42.78%(NaCleq), respectively. The densities of the trapped fluids vary from 0.91 g/cm3 to 1.10 g/cm3. Raman spectra of the inclusions indicate that water vapor is the dominant component with minor amount of CO2 (possibly a little N2 in some cases) in the gasous phase of the inclusions. The typical shift in oxygen isotope compositions suggests a mixing event between magmatic and meteoric water. In summary, the deposit is an intermediate-high temperature epithermal deposit, and the fluid mixing plays crucially significant roles in the mineralization. |
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