| 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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| 引用本文：张冠,李厚民,王成辉,王登红,李立兴,张建.2008.河南桐柏老湾金矿白云母氩-氩年龄及其地质意义[J].地球学报,29(1):45-50. |
| DOI：10.3975/cagsb.2008.01.06 |
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| 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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| 中文摘要:河南老湾金矿是秦岭-大别造山带中代表性金矿之一,其容矿围岩是元古宙变质岩,矿体受到NWW向老湾剪切带的控制,同时附近又有燕山期花岗岩.结合前人工作,本次研究表明,老湾金矿的形成经历了一个漫长过程,其韧性剪切带的演化(138 Ma)早在花岗岩(108～102 Ma)之前就开始了.韧性剪切带既是导岩构造也是导矿构造,含金石英脉的定位最晚(91 Ma).这一漫长过程与秦岭-大别造山带在燕山期的演化过程一致. |
| 中文关键词:老湾金矿 同位素年代学 Ar-Ar法 剪切带 |
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| 40Ar-39Ar Age of Muscovite from the Laowan Gold Deposit in Henan and Its Significance |
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| Abstract: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. |
| keywords:Laowan gold deposit geochronology Ar-Ar method shear zone |
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