| 河南桐柏老湾金矿白云母氩-氩年龄及其地质意义 |
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| 关键词:Laowan gold deposit geochronology Ar-Ar method shear zone |
| 基金项目:中国地质调查局“中国成矿体系综合研究”项目(编号:1212010634002); “我国重要矿产和区域成矿规律研究”(编号:1212010633903); “我国西部重要成矿区带矿产资源潜力评估”(编号:200420190004) |
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| 40Ar-39Ar Age of Muscovite from the Laowan Gold Deposit in Henan and Its Significance |
| The Laowan gold deposit in Henan Province,one of the most important gold deposits in the Qinling-Dabie orogenic belt,is hosted within Proterozoic metamorphic rocks,controlled by the Lanwan NWW-trending shear zone and related to the nearby Laowan Yanshanian granite.Based on a comprehensive study and a new Ar-Ar age of muscovite from the Au-bearing shear zone,the authors hold that the Laowan gold deposit experienced a long time of evolution:the development of the shear zone began at 138 Ma,then the granite intruded at 108～102 Ma,and the Au-bearing quartz veins were formed at 91 Ma.These results show that gold mineralization was related to the Yanshanian magmatism,and that the NWW-trending shear zone might have been the main structure controlling the movement of magma and ore-bearing fluids.Thus,the NNW-trending shear zone seems to be the most important target area for further exploration. |
| ZHANG Guan,LI Hou-min,WANG Cheng-hui,WANG Deng-hong,LI Li-xing,ZHANG Jian.2008.40Ar-39Ar Age of Muscovite from the Laowan Gold Deposit in Henan and Its Significance[J].Acta Geoscientica Sinica,29(1):45-50. |
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