| 胶东谢家沟金矿床蚀变钾长石40Ar-39Ar年龄及地质意义 |
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| 引用本文： | 杜泽忠,程志中,姚晓峰,于晓飞,孙海瑞,鲍兴隆,李少华.胶东谢家沟金矿床蚀变钾长石40Ar-39Ar年龄及地质意义[J].吉林大学学报(地球科学版),2020,50(5):1570-1581. |
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| 作者姓名： | 杜泽忠 程志中 姚晓峰 于晓飞 孙海瑞 鲍兴隆 李少华 |
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| 作者单位： | 1. 中国地质调查局发展研究中心/自然资源部矿产勘查技术指导中心, 北京 100037;2. 招金集团金亭岭矿业公司, 山东 招远 265400 |
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| 基金项目： | 国家重点研发计划项目（2017YFC0601506）；中国地质调查局项目（DD20160050，DD20190159） |
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| 摘 要： | 谢家沟金矿床位于胶西北焦家断裂带和招平断裂带之间。在系统观察坑道各类蚀变现象的基础上，发现围岩蚀变主要有钾长石化、硅化、黄铁矿化、绢云母化，其次可见绿泥石化和碳酸盐化等；基于蚀变的叠加和穿插关系查明了不同阶段的主要热液作用记录，从早到晚依次为钾长石化、黄铁绢英岩化、陡立石英硫化物细脉；蚀变具有明显的空间分带现象，从中心到两侧分别为陡立石英硫化物细脉带、黄铁绢英岩化带、钾长石化带。本次研究对蚀变钾长石开展了40Ar-39Ar精细测年工作，获得的坪年龄为（112.79±0.62）Ma（MSWD=5.76），与等时线年龄（（115.56±1.72）Ma（MSWD=4.59））一致，限定了谢家沟金矿床的钾化蚀变年龄，与胶东地区获得的金成矿事件年龄相近，说明谢家沟金矿床与胶东地区金矿床是在同一成矿-热事件下形成的。结合区域岩浆演化特征，胶东地区在郭家岭岩体形成之后、在（120±10）Ma还存在一期与金成矿关系密切的岩浆活动。
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| 关 键 词： | 谢家沟金矿 蚀变钾长石 40Ar-39Ar年龄 |
| 收稿时间： | 2019-12-19 |
40Ar-39Ar Age of Altered Potash Feldspar of Xiejiagou Gold Deposit in Jiaodong and Its Geological Significance |
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| Du Zezhong,Cheng Zhizhong,Yao Xiaofeng,Yu Xiaofei,Sun Hairui,Bao Xinglong,Li Shaohua.40Ar-39Ar Age of Altered Potash Feldspar of Xiejiagou Gold Deposit in Jiaodong and Its Geological Significance[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(5):1570-1581. |
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| Authors: | Du Zezhong Cheng Zhizhong Yao Xiaofeng Yu Xiaofei Sun Hairui Bao Xinglong Li Shaohua |
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| Institution: | 1. Development and Research Center, China Geological Survey/Mineral Exploration Technical Guidance Center, Ministry of Natural Resources, Beijing 100037, China;2. Jintingling Mining Industry Zhaojin Co. LTD., Zhaoyuan 265400, Shandong, China |
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| Abstract: | Xiejiagou gold deposit is located between Jiaojia fault zone and Zhaoyuan-Pingdu fault zone in southwest Jiaodong. Based on the systematic observation of various alteration phenomena in the tunnels, we found that the wall rock alteration of the deposit includes mainly potash feldspathization, silicification, pyrite mineralization, and sericitization, followed by chloritization and carbonation, and the main hydrothermal effects at different stages were determined based on the superposition and interpenetration of alteration. From early to late, it is potash feldspathization, pyrite-sericite-quartz, and steep quartz sulfide veinlet;from the center to both sides,the alteration is steep quartz sulfide veinlet, pyrite-sericite-quartz,and potash feldspathization. The 40Ar-39Ar fine dating of altered potassium feldspar shows that the obtained plateau age is (112.79±0.62) Ma (MSWD=5.76), and the isochronous age is ((115.56±1.72) Ma (MSWD=4.59)). The two ages are almost the same, which indicates that the formation of Xiejiagou gold deposit is the same metallogenic thermal event as the gold mineralization of Jiaodong area. Combining with the regional magmatic evolution characteristics, after the formation of Guojialing rock mass in Jiaodong area, there was still a phase of magmatic activity that is closely related to the gold mineralization at (120±10) Ma. |
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| Keywords: | Xiejiagou gold deposit altered potash feldspar 40Ar-39Ar age |
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