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| 吉林四方甸子钼矿床成岩成矿时代及岩石地球化学特征 | |
| 引用本文： | 张勇,孙景贵,邢树文,赵克强,王岩,邱殿明,刘思宇,陈明.吉林四方甸子钼矿床成岩成矿时代及岩石地球化学特征[J].吉林大学学报(地球科学版),2014,44(6):1869-1882. |
| 作者姓名： | 张勇 孙景贵 邢树文 赵克强 王岩 邱殿明 刘思宇 陈明 |
| 作者单位： | 1.中国地质科学院矿产资源研究所/国土资源部成矿作用与资源评价重点实验室, 北京100037; 2.吉林大学地球科学学院, 长春130061; 3.吉林大学学报编辑部, 长春130026; 4.吉林省地质科学研究所，长春130012; 5.吉林省区域地质矿产调查所，长春130022 |
| 基金项目： | 国家自然科学基金项目，吉林省科技发展规划项目，中国地质调查局地质调查工作项目 |
| 摘 要： | 吉林四方甸子钼矿床是一新发现的石英脉型钼矿床，矿床产于二长花岗岩中。矿床成矿包括无矿石英脉阶段、石英-辉钼矿-黄铁矿阶段和石英-碳酸盐化阶段。通过对矿区内花岗质岩石进行LA-ICP-MS同位素测年，获得花岗闪长岩成岩年龄为（170.0±1.0） Ma，二长花岗岩成岩年龄为（179.0±1.0） Ma。对含矿石英脉中辉钼矿Re-Os同位素测年分析，获得辉钼矿模式年龄值为（175.0 ± 2.6）～（176.5 ± 2.6） Ma，加权平均值为（176.1 ± 1.1） Ma，等时线年龄为（176.6 ± 4.2） Ma，表明四方甸子钼矿床形成于早侏罗世晚期。岩体w(SiO2)为66.17%～76.60%，w(Na2O)和w(K2O)分别为3.15%～5.40%和2.42%～5.42%，里特曼指数σ为2.17～2.93。稀土元素分布形式呈右倾型，轻、重稀土元素分馏明显。微量元素总体显示相对富集Rb、Ba、Th、U等大离子亲石元素（LILE），亏损Nb、Ta、Ti、P等高场强元素（HFSE）。综合分析表明，岩石为弱过铝质I型花岗岩。成岩成矿动力学背景为燕山早期古太平洋板块向欧亚大陆俯冲作用的大陆边缘环境。 |
| 关 键 词： | LA-ICP-MS 锆石U-Pb年龄 辉钼矿Re-Os年龄 岩石地球化学 四方甸子钼矿床 吉林桦甸 |
| 收稿时间： | 2014-04-12 |
Diagenetic and Metallogenic Geochronology and Geochemical Characteristics of the Sifangdianzi Molybdenum Deposit in Jilin Province |
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| Zhang Yong,Sun Jinggui,Xing Shuwen,Zhao Keqiang,Wang Yan,Qiu Dianming,Liu Siyu,Chen Ming.Diagenetic and Metallogenic Geochronology and Geochemical Characteristics of the Sifangdianzi Molybdenum Deposit in Jilin Province[J].Journal of Jilin Unviersity:Earth Science Edition,2014,44(6):1869-1882. | |
| Authors: | Zhang Yong Sun Jinggui Xing Shuwen Zhao Keqiang Wang Yan Qiu Dianming Liu Siyu Chen Ming |
| Institution: | 1.Institute of Mineral Resources,CAGS/MLR Key Laboratory of Metallogeny and MineralAssessment,Beijing100037，China; 2.College of Earth Sciences, Jilin University, Changchun130061, China; 3.Editorial Department of Journal, Jilin University, Changchun130026, China; 4.Institute of Geologic Sciences of Jilin Province, Changchun130012, China; 5.Regional Survey of Geology and Mineral Resources of Jilin Province, Changchun130022, China |
| Abstract: | The Sifangdianzi Mo deposit in Jilin Province is a recently discovered quartz-vein type molybdenum deposit. The orebodies are mainly hosted in monzogranite. Its ore-forming processes can be divided into three stages: barren quartz-vein stage, quartz-molybdenite-pyrite stage and quartz-carbonatate stage. By the LA-ICP-MS U-Pb dating of zircons, we obtained the age of 170.0±1.0 Ma for granodiorite, and the age of 179.0±1.0 Ma for monzogranite. Based on the Re-Os dating of molybdenite from quartz vein type ore, the model ages obtained are from 175.0±2.6 to 176.5±2.6 Ma averaged at 176.1±1.1 Ma, and having an isochronic age of 176.6±4.2 Ma. It is indicated that the Sifangdianzi Mo deposit was formed in the early Jurassic Period. SiO2 values of the granitic rocks change from 66.17% to 76.60%, Na2O and K2O are in the range of 3.15% to 5.40% and 2.42% to 5.42% respectively, their Rittmann indexes vary from 2.17 to 2.93; Their REE patterns demonstrate right-oblique linear REE patterns, the trace elements show relative enrichment of the large ion lithophile elements, and depletion of the high field strength elements. The geochemical characteristics of the granitic rocks imply they belong to I-type granite. The geotectonic mechanisms responsible for the diagenesis and mineralization were probably related to subduction of the paleo-Pacific Plate to the Eurasian continent. |
| Keywords: | zircon LA ICP MS age molybdenite Re Os age rock geochemistry the Sifangdianzi molybdenite Mo deposit Huadian County of Jilin Province |
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