| 鄂东铜绿山矿区石英正长闪长玢岩锆石SHRIMP U-Pb定年及其地质意义 |
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| 引用本文：梅玉萍,李华芹,陈富文.2008.鄂东铜绿山矿区石英正长闪长玢岩锆石SHRIMP U-Pb定年及其地质意义[J].地球学报,29(6):805-810. |
| DOI：10.3975/cagsb.2008.06.23 |
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| 基金项目:国家科技支撑计划“南岭地区有色-贵重金属成矿潜力及综合探测技术示范研究”(编号:2006BAB01B03); 国土资源大调查“我国重要矿产和区域成矿规律研究”(编号:1212010633903); “中国成矿体系综合研究”(编号:1212010634002) |
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| 中文摘要:铜绿山铜金(铁)矿床位于长江中下游的鄂城-大冶-瑞昌铜金(铁)成矿带的西北部,阳新侵入岩体西北端.矿体赋存于下三叠统大冶群第四至第七岩性段.铜绿山石英正长闪长玢岩体与铜绿山矿床成矿关系密切,是该矿床的成矿母岩.笔者对铜绿山石英正长闪长玢岩体进行了锆石SHRIMP U-Pb定年,获得岩体的形成年龄为(146±1)Ma(95%可信度,MSWD=1.6).表明铜绿山铜金矿床的成矿母岩形成于晚侏罗世-早白垩世早期.鉴于接触交代成矿作用与成矿岩体的结晶时问大致同时,铜绿山矽卡岩型铜金(铁)矿床的形成时间亦发生于晚侏罗世-早白垩世. |
| 中文关键词:铜金(铁)矿 锆石SHRIMP U-Pb年龄 铜绿山 地质意义 |
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| SHRIMP U-Pb Zircon Dating of the Quartz-Orthoclase Diorite Porphyrite from the Tonglushan Orefield in Eastern Hubei Province and Its Geological Implication |
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| Abstract:Located in the northwestern part of the Echen-Daye-Ruichang metallogenetic belt in the middle and lower reaches of the Yangtze River,the Tonglushan Cu-Au(Fe)deposit occurs in the northwestern segment of the Yangxin quartz-orthoclase diorite porphyrite and lies in 4th-7th Members of the Lower Triassic Daye Group.The porphyrite as the parent rock of Cu-Au(Fe)mineralization is closely related to the deposit.Zircon SHRIMP U-Pb age of(146±1)Ma(95% confidence,MSWD=1.2)shows that the porphyrite was formed in the Late Jurassic-Early Cretaceous period.According to the fact that contact metasomatic mineralization took place simultaneously with the crystallization of mineralized intrusion,it is concluded that the Tonglushan skarn type Cu-Au(Fe)deposit was also formed in the Late Jurassic-Early Cretaceous period. |
| keywords:Cu-Au（Fe）deposit zircon SHRIMP U-Pb age Tonglushan geological significance |
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