| 黑龙江新立金矿床片麻状花岗岩锆石U-Pb定年及其地质意义 |
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| 引用本文： | 张琳,杨言辰,韩世炯,薄军委,王凤博,聂世嘉.黑龙江新立金矿床片麻状花岗岩锆石U-Pb定年及其地质意义[J].延边大学理工学报,2016,0(5):638-648. |
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| 作者姓名： | 张琳 杨言辰 韩世炯 薄军委 王凤博 聂世嘉 |
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| 作者单位： | 吉林大学 地球科学学院，吉林 长春 130061 |
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| 摘 要： | 黑龙江新立金矿床位于兴蒙造山带东段佳木斯地块中部，矿体赋存于柳毛组云母石英片岩的层间破碎带中。通过对矿区片麻状花岗岩LA-ICP-MS锆石U-Pb定年及全岩主量元素、微量元素地球化学特征的研究，探讨了其成因类型、形成时代和构造背景。岩石地球化学显示，片麻状花岗岩具有准铝质—过铝质的钙碱性系列岩石特征，富集大离子亲石元素(Rb、K、Ba)，不同程度地亏损高场强元素(U、Ta、Nb、Zr、Ti、Hf)，轻、重稀土元素分馏明显，亏损重稀土元素，呈弱Eu负异常。LA-ICP-MS锆石U-Pb定年获得片麻状花岗岩的成岩时代为(266.0±4.7)Ma，成矿流体为花岗质岩浆演化晚期的产物，因此，推测新立金矿床的成矿时代为晚二叠世。矿区片麻状花岗岩的成因类型为I型花岗岩，形成于晚古生代古亚洲洋板块俯冲消减的构造环境。
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| 关 键 词： | 片麻状花岗岩 I型花岗岩 岩石地球化学 锆石U-Pb年龄 成矿时代 新立金矿床 黑龙江 |
Zircon U-Pb Dating and Geological Significance of Gneissic Granite in Xinli Gold Deposit of Heilongjiang |
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| ZHANG Lin,YANG Yan-chen,HAN Shi-jiong,BO Jun-wei,WANG Feng-bo,NIE Shi-jia.Zircon U-Pb Dating and Geological Significance of Gneissic Granite in Xinli Gold Deposit of Heilongjiang[J].Journal of Yanbian University (Natural Science),2016,0(5):638-648. |
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| Authors: | ZHANG Lin YANG Yan-chen HAN Shi-jiong BO Jun-wei WANG Feng-bo NIE Shi-jia |
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| Affiliation: | College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China |
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| Abstract: | Xinli gold deposit in Heilongjiang is located in the center of Jiamusi massif, which belongs to the eastern section of Xing-Meng orogenic belt. The ore bodies are hosted in interstratified fracture belt of Liumao Formation mica-quartzose schist. LA-ICP-MS zircon U-Pb dating of gneissic granite was analyzed, and the geochemistry characteristics of whole rock major and trace elements were reported, and the petrogenesis, formation age and tectonic setting were discussed. The petrogeochemistry shows that gneissic granite is characterized by calc-alkaline and metaluminous-peraluminous rocks, and is enriched in large ion lithophile elements(Rb, K and Ba), and is depleted with different degrees in high field strength elements(U, Ta, Nb, Zr, Ti and Hf); the fractionation of light and heavy rare earth elements is obvious, and heavy rare earth element is depleted, and negative Eu anomaly is weak. LA-ICP-MS zircon U-Pb age of gneissic granite is (266.0±4.7)Ma. The ore-forming fluids are produced in late period during granitic magma evolution, so that the metallogenic age of Xinli gold deposit maybe Late Permian. The gneissic granite belongs to I-type granite, and is formed by the subduction of Paleo-Asian Ocean Plate in Late Paleozoic. |
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| Keywords: | gneissic granite I-type granite petrogeochemistry zircon U-Pb age metallogenic age Xinli gold deposit Heilongjiang |
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