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| 延边地区九三沟金矿床赋矿围岩的锆石U-Pb年龄与成岩成矿时代 | |
| 引用本文： | 柴鹏,孙景贵,门兰静,张勇,韩世炯,白令安,刘勇胜.延边地区九三沟金矿床赋矿围岩的锆石U-Pb年龄与成岩成矿时代[J].岩石矿物学杂志,2012,31(5):633-640. |
| 作者姓名： | 柴鹏 孙景贵 门兰静 张勇 韩世炯 白令安 刘勇胜 |
| 作者单位： | 1. 吉林大学地球科学学院,吉林长春,130061 2. 长春工程学院,吉林长春,130021 3. 中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉,430074 |
| 基金项目： | 国家自然科学基金资助项目(40772052,41172072);中国地质调查局地质矿产调查评价项目(资[2011]02-38-05);黑龙江省地质矿产局地质调查研究院课题资助项目(3R1101604422) |
| 摘 要： | 九三沟金矿床是吉林省延边地区一座典型的浅成中高温热液金矿床.为了深入研究其成矿规律,首次对延边地区九三沟金矿床赋矿围岩蚀变闪长玢岩进行了锆石LA- ICP-MS年代学精细研究.实验获得单颗粒锆石U-Pb谐和年龄在103～ 116 Ma之间,其加权平均年龄为109.3±2.1 Ma(MSWD=7.0,n=18),代表闪长玢岩成岩年龄.谐和年龄可被细分为两段:112～116 Ma(平均值=113.1±1.1 Ma,n=9,MSWD=0.55,置信度为0.82)和103～110 Ma(平均值=105.8±1.8 Ma,n=9,MSWD=2.2,置信度为0.022).结合年龄数据、锆石晶形和CL图像特征,初步厘定前者应代表闪长玢岩主体结晶年龄,而后者则代表岩浆演化结束的时代.再结合区域成矿规律和之前取得的成果,限定九三沟金矿成矿作用应发生在106 Ma之后,成矿环境适值早白垩世晚期伊泽奈崎板块向古亚洲大陆边缘俯冲消亡、中国东部大陆边缘燕山造山期末的走滑、伸展构造转换过程. |
| 关 键 词： | 锆石U-Pb年龄 成岩成矿时代 九三沟金矿床 延边地区 |
| 收稿时间： | 2012/3/27 0:00:00 |
| 修稿时间： | 2012/7/12 0:00:00 |
U-Pb dating of zircons from host rocks of the Jiusangou gold deposit in Yanbian area and determination of rock-forming and ore-forming epochs |
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| CHAI Peng,SUN Jing-gui,MEN Lan-jing,ZHANG Yong,HAN Shi-jiong,BAI Ling-an and LIU Yong-sheng.U-Pb dating of zircons from host rocks of the Jiusangou gold deposit in Yanbian area and determination of rock-forming and ore-forming epochs[J].Acta Petrologica Et Mineralogica,2012,31(5):633-640. | |
| Authors: | CHAI Peng SUN Jing-gui MEN Lan-jing ZHANG Yong HAN Shi-jiong BAI Ling-an and LIU Yong-sheng |
| Institution: | 1.College of Earth Sciences,Jilin University,Changchun 130061,China;2.Changchun Institute of Technology,Changchun 130021,China;3.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China) |
| Abstract: | The Jiusangou ore deposit in Yanbian area of Jilin Province is a typical epithermal-mesothermal gold deposit.In this study,detailed studies were carried out by means of zircon LA-ICP-MS U-Pb dating of the host rock of the Jiusangou gold deposit,i.e.,altered diorite porphyrite.The analysis yielded U-Pb concordant ages of single zircons from 103 Ma to 116 Ma,with weighted mean age being 109.3±2.1 Ma(MSWD=7.0,n=18),which can be regarded as the rockforming age of diorite porphyrite.The ages obtained can be subdivided into two groups: 112～116 Ma(Mean=113.1±1.1 Ma,n=9,MSWD=0.55,reliability=0.82)and 103～110 Ma(Mean=105.8±1.8 Ma,n=9,MSWD=2.2,reliability=0.022).According to the age of zircons and the crystal form of zircons or CL image characteristics,it is preliminarily determined that the former group of ages should represent the crystallization age of the main body of the diorite porphyrite,whereas the latter group of ages should represent the end of the magmatic evolution.According to regional metallogenic regularity and previous achievements,the authors hold that the thermal event of the gold mineralization took place before 106 Ma.The results of this study suggest that the metallogenic environment was the subduction and extinction of Izanaqi plate towards the ancient Asian continent in late Early Cretaceous and the conversion process of slip or extension structures in eastern China continental margin during the Late Yanshanian orogenic movement. |
| Keywords: | zircon U-Pb age rock-froming and ore-forming age Jiusangou gold deposit Yanbian area |
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