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鄂东鸡冠嘴矿区成矿岩体锆石SHRIMP U-Pb定年及其意义
引用本文:李华芹,陈富文,梅玉萍.鄂东鸡冠嘴矿区成矿岩体锆石SHRIMP U-Pb定年及其意义[J].大地构造与成矿学,2009,33(3).
作者姓名:李华芹  陈富文  梅玉萍
作者单位:中国地质调查局宜昌地质矿产研究所,湖北,宜昌,443003
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",国土资源大调查"我国重要矿产和区域成矿规律研究","中国成矿体系综合研究"(1212010634002)的部分研究成果 
摘    要:鄂东鸡冠嘴铜金(铁)矿床位于阳新岩体西北端,与铜绿山铜金矿床毗邻。矿区成矿岩体主要岩性为石英正长闪长玢岩、石英闪长岩、闪长岩和安山玢岩。其中石英正长闪长玢岩与成矿关系密切。在前人矿床地质特征研究基础上,笔者对成矿岩体进行了锆石SHRIMP U-Pb定年,获得石英正长闪长玢岩和闪长岩的年龄为146±2Ma(95%可信度,MSWD=1.3)和132±4Ma(95%可信度,MSWD=3)。测定结果表明,区内石英正长闪长玢岩和闪长岩分属燕山早期和燕山晚期岩浆活动的产物。鉴于矿体在空间上主要赋存于岩体内外接触带及层间破碎带中,推测成矿作用应略晚于石英正长闪长玢岩(146±2Ma)而早于闪长岩侵位的时间(132±4Ma),这与前人获得长江中下游铜铁金成矿带代表性矿床的辉钼矿Re-Os模式年龄分布在134.7~143Ma的研究结果一致。

关 键 词:成矿岩体  锆石SHRIMP定年  铜金(铁)矿床  鸡冠嘴

SHRIMP U-Pb Zircon Dating of the Mineralized Intrusion from Jiguanzui Orefield in Eastern Hubei Province and Its Geological Significance
LI Huaqin,CHEN Fuwen,MEI Yuping.SHRIMP U-Pb Zircon Dating of the Mineralized Intrusion from Jiguanzui Orefield in Eastern Hubei Province and Its Geological Significance[J].Geotectonica et Metallogenia,2009,33(3).
Authors:LI Huaqin  CHEN Fuwen  MEI Yuping
Abstract:The Jiguanzui Cu-Au (Fe) deposit is located at northwest part of the Yangxin intrusion and neighbours on the Tonglushan Cu-Au (Fe) deposit. The mineralized intrusion in the orefield consists mainly of quartz orthoclase diorite porphyrite,quartz diorite,diorite and andesite porphyrite,and the quartz orthoclase diorite porphyrite is closely related with the Cu-Au(Fe) mineralization. Zircon SHRIMP U-Pb ages with 146±2 Ma (95% confidence,MSWD=1.3) for quartz orthoclase diorite porphyrite and 132±4 Ma (95% confidence,MSWD=3) for diorite in the orefield show that the porphyrite and diorite were formed during Early Yanshanian and Late Yanshanian period,respectively. According to that the orebodies occur mainly in the contact zone of the mineralized intrusion or interlayer fractured zone,the authors believe that the mineralization happened between emplacement of the quartz orthoclase diorite porphyrite (146±2 Ma) and diorite (132±4 Ma),which accords with the molybdenite Re-Os age (134.7~143 Ma) of representative Cu-Au (Fe) deposits in the middle and lower reaches of the Yangtze River.
Keywords:mineralized intrusion  zircon SHRIMP U-Pb dating  Cu-Au(Fe) deposit  Jiguanzui
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