| 金厂沟梁—二道沟金矿田内花岗岩类侵入体锆石的离子探针U—Pb年代及意义 |
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| 引用本文： | 苗来成,范蔚茗,翟明国,Qiu Y M,McNaughton N J,Groves D I.金厂沟梁—二道沟金矿田内花岗岩类侵入体锆石的离子探针U—Pb年代及意义[J].岩石学报,2003,19(1):71-80. |
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| 作者姓名： | 苗来成 范蔚茗 翟明国 Qiu Y M McNaughton N J Groves D I |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所,北京,100029
2. Key Center for Strategic Mineral Deposits, Department of Geology & Geophysics, the University of Western Australia, Nedlands 6907, Australia |
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| 基金项目： | 国家基础研究规划项目(G1999043207)，中国科学院重大创新项目(KZCX2-104)，中国-西澳经济技术研究基金 |
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| 摘 要： | 金厂沟梁-二道沟金矿田内花岗岩类侵入体SHRIMP锆石U-Ph定年结果表明,该区中生代以来到少经历了三次中酸性岩浆侵入作用,它们分别以西台子二长花岗岩、娄上含辉石石英闪长岩和西对面沟花岗闪长岩及闪长玢岩脉在218±4Ma(印支期)、161±1Ma(燕山早期)和126±1Ma(燕山晚期)的侵位为标志。花岗岩类的地球化学资料表明,这些花岗岩类侵入体形成与造山作用有关,为造山后或陆内拉张作用的产物。二道沟矿区成矿前或成矿期闪长玢岩脉的年龄126±1Ma限定了该区金矿化的最大年龄;结合前人有关年代学资料,认为本区金矿化应发生在126～118Ma。这说明金厂沟梁-二道沟金矿田的金矿床与我国胶东、小秦岭和辽东等地区的金矿床是同时形成的,再次证明燕山晚期是中国最重要而广泛的金成矿期。此外,在这些主要的金矿区内,金矿化时间上均具有与各自区内最晚一次花岗质岩浆作用同时或稍晚的特征,这可能指示金矿床是造山作用或区域构造-岩浆演化最晚期的产物。
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| 关 键 词： | 金矿田 离子探针 花岗岩类侵入本 锆石 SHRIMP 年代学 成矿时代 造山作用 |
| 文章编号： | 1000-0569/2003/019(01)-0071-80 |
| 修稿时间： | 2002年4月10日 |
Zircon SHRIMP U-Pb geochronology of the granitoid intrusions from Jinchanggouliang-Erdaogou gold orefield and its significance. |
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| MIAO LaiCheng,FAN WeiMing,ZHAI MinGuo,Qiu Y M,McNaughton N J and Groves D I.Zircon SHRIMP U-Pb geochronology of the granitoid intrusions from Jinchanggouliang-Erdaogou gold orefield and its significance.[J].Acta Petrologica Sinica,2003,19(1):71-80. |
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| Authors: | MIAO LaiCheng FAN WeiMing ZHAI MinGuo Qiu Y M McNaughton N J and Groves D I |
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| Institution: | MIAO LaiCheng,FAN WeiMing,ZHAI MinGuo,Qiu Y M,McNaughton N J and Groves D I . Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China. Key Center for Strategic Mineral Deposits,Department of Geology & Geophysics,the University of Western Australi,Nedlands,Australia |
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| Abstract: | The SHRIMP U-Pb dating results on zircons from granitoid intrusions in Jinchanggouliang- Erdaogou gold orefield suggest that this region experienced at least three phases of magmatism during Mesozoic, which are represented by the emplacements of the Xitaizi monogranite, the Loushan pyroxene-bearing quartz diorite, and the Xiduomiangou granodiorite as well as dioritic dike at 218 ?4 Ma (Indosinian), 161 ?1 Ma (early Yanshanian) and 126 ?1 Ma (late Yanshanian), respectively. The geochemical characteristics of these intrusions indicate that they were related to orogenesis, formed at intracontinental extensional periods of late- or post-orogenesis. The age of 126 ?1 Ma of the pre- or syn-gold mineralization dioritic dike from Erdaogou mine district constrains the maximum age of the gold mineralization in the area, which, in combination with previous geochronology data, indicates that gold mineralization in the area took place at between 126-118 Ma. This shows that the gold deposits in the district are essentially coeval with those of other gold-concentrating provinces in North China Craton, such as Jiaodong, Xiaoqinling and Liaodong, and further confirms that the late Yanshanian is the most important and extensive period of gold mineralization in north China. In addition, the similarities of the late timing of gold mineralization with respect to the latest felsic magmatism in these major gold-concentrating areas are probably indicative of that gold mineralization is likely a latest stage product of orogeneses or regional tectono-magmatism. |
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| Keywords: | Granitoid intrusion Zircon SHRIMP Geochronology Jinchanggouliang-Erdaogou |
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