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| 吉林省新华龙钼矿床流体包裹体 | |
| 引用本文： | 张勇,孙景贵,邢树文,赵克强,邱殿明.吉林省新华龙钼矿床流体包裹体[J].吉林大学学报(地球科学版),2013,43(6):1878. |
| 作者姓名： | 张勇 孙景贵 邢树文 赵克强 邱殿明 |
| 作者单位： | 1.吉林大学地球科学学院,长春130061; 2.中国地质科学院矿产资源研究所,北京100037; 3.吉林大学学报编辑部, 长春130026 |
| 基金项目： | 吉林省科技发展计划规划项目;中国地调局项目;中国地调局地质调查项目;国家自然科学基金 |
| 摘 要： | 新华龙钼矿床位于中国东北地区吉林省东部，是一个新发现的斑岩型钼矿床。矿床产于花岗闪长斑岩中。矿床成矿阶段包括石英-浸染状辉钼矿、石英-网脉状辉钼矿、石英-黄铁矿-黄铜矿、石英-多金属硫化物和石英-碳酸盐化5个阶段。流体包裹体实验结果表明：流体包裹体的类型主要为气液两相包裹体，其次为纯气相和纯液相包裹体，还有少量含子矿物的多相包裹体。流体包裹体的均一温度为172～385 ℃，盐度(w(NaCl))为8.51%～45.44%。从早阶段到晚阶段成矿流体温度具有规律的演化，均一温度分别为360～390 ℃、270～350 ℃、250～260 ℃、220～230 ℃、170～190 ℃。其中:含子矿物多相包裹体均一温度为272～385 ℃，盐度为35.79％～45.44％，密度为1.07～1.08 g/cm3；气液两相包裹体均一温度为172～381 ℃，盐度为8.51％～23.36％，密度为0.70～0.99 g/cm3。激光拉曼光谱分析表明，包裹体的气体成分主要为CO2、H2O、N2和CH4。包裹体岩相学及测温表明，流体由早期的高温、高盐度、含二氧化碳的含矿流体在主成矿阶段发生流体包裹体的沸腾、CO2逸出、温度降低等过程,导致大量金属硫化物沉淀。结合氢氧同位素特征，初步确定该矿床的成矿流体主要以岩浆水为主，后期有大气水的加入。流体沸腾是新华龙钼矿床成矿的重要机制。 |
| 关 键 词： | 流体包裹体 成矿作用 新华龙钼矿床 金属矿床 延边地区 |
| 收稿时间： | 2013-03-10 |
Fluid Inclusions in the Xinhualong Molybdenum Deposit,Jilin Province |
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| Zhang Yong,Sun Jinggui,Xing Shuwen,Zhao Keqiang,Qiu Dianming.Fluid Inclusions in the Xinhualong Molybdenum Deposit,Jilin Province[J].Journal of Jilin Unviersity:Earth Science Edition,2013,43(6):1878. | |
| Authors: | Zhang Yong Sun Jinggui Xing Shuwen Zhao Keqiang Qiu Dianming |
| Institution: | 1.College of Earth Sciences, Jilin University, Changchun130061, China; 2.Institute of Mineral Resources Chinese Academy of Geological Sciences, Beijing100037, China; 3.Editorial Department of Journal, Jilin University, Changchun130026, China |
| Abstract: | The Xinhualong molybdenum deposit, located in the eastern Jilin Province, is a newly discovered porphyry deposit. The orebodies are mainly hosted in granodiorite-porphyry. The hydrothermal ore-forming processes can be divided into five stages: quartz-disseminated molybdenite, quartz-stockwork molybdenite, quartz-pyrite-chalcopyrite, quartz-polymetallic sulfides, quartz-carbonate. Some conclusions have been drawn through petrographic observation of fluid inclusions in this deposit: there are mainly gas liquid two-phase (L+V) inclusions, subordinately pure gas (V) and pure liquid inclusions (L), and minor daughter minerals bearing multiphase inclusions (L+V+S). The homogenization temperatures of fluid inclusions regularly change from the early stage to the late stage. The homogenization temperatures and salinities of fluid inclusions ranges from 172-385 ℃, and from 8.51%-45.44％, respectively. The peak values of homogenization temperatures of fluid inclusions formed in different stages are separately 360-390 ℃, 270-350 ℃, 250-260 ℃, 220-230 ℃, 170-190 ℃. The homogenization temperatures of daughter minerals bearing inclusions mainly range from 272-385 ℃, salinities from 35.79％-45.44％, and densities from 1.07-1.08 g/cm3 respectively. Gas liquid two-phase inclusions are mainly in ranges of 172-381 ℃, 8.51％-23.36％, and 0.7-0.99 g/cm3 respectively. Laser Raman spectroscopy of inclusions indicate that the gas components are CO2, H2O, N2 and CH4. Petrographic and microthermometric studies indicate that the ore-forming fluid of the first and the second stage, with high temperature, high salinities, CO2-bearing, took place boiling. The fluid boiling resulted in CO2 escaping, temperature decreasing and abundant metal sulfides precipitating. Moreover, data of oxygen and hydrogen isotope indicate that the ore-forming hydrothermal fluid was dominated by magmatic water with mixing of meteoric water in the later stage, and the mechanism for ore-metals precipitation is fluid-boiling. |
| Keywords: | fluid inclusion mineralization Xinhualong molybdenum deposit ore deposits Yanbian area |
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