| 黑龙江东安金矿床锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 马芳芳,孙丰月,李碧乐,薛明轩.黑龙江东安金矿床锆石U-Pb年龄及其地质意义[J].地质与资源,2012,21(3):277-280. |
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| 作者姓名： | 马芳芳 孙丰月 李碧乐 薛明轩 |
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| 作者单位： | 1. 吉林大学 地球科学学院, 吉林 长春 130061;2. 黑龙江省有色金属地质勘查707队, 黑龙江 绥化 152054 |
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| 摘 要： | 通过LA-ICPMS锆石原位定年方法，对黑龙江东安金矿成矿期脉岩流纹斑岩进行了年龄测定.结果显示，与矿化关系极为密切的流纹斑岩的U和Th含量分别为269.1×10-6~956.0×10-6和202.2×10-6~1276.8×10-6，Th/U比值介于0.43~1.80之间.流纹斑岩206Pb/238U年龄的加权平均值为109.6±1.7 Ma，与区内浅成低温热液金矿的成矿年龄相近，共同记录了本区早白垩世晚期的一次重要成岩成矿事件，反映了早白垩世晚期岩石圈大规模伸展减薄的动力学背景.
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| 关 键 词： | 锆石U-Pb年龄 地质意义 矿化关系 东安金矿床 黑龙江省 |
| 收稿时间： | 2012-03-12 |
ZIRCON U-Pb AGES OF DONGAN GOLD DEPOSIT IN HEILONGJIANG PROVINCE: Geological Implication |
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| MA Fang-fang
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SUN Feng-yue
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LI Bi-le
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XUE Ming-xuan.ZIRCON U-Pb AGES OF DONGAN GOLD DEPOSIT IN HEILONGJIANG PROVINCE: Geological Implication[J].Geology and Resources,2012,21(3):277-280. |
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| Authors: | MA Fang-fang SUN Feng-yue LI Bi-le XUE Ming-xuan |
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| Institution: | 1. School of Earth Sciences, Jilin University, Changchun 130061, China;2. No. 707 Team, Heilongjiang Nonferrous Metallic Geological Survey, Suihua 152054, Heilongjiang Province, China |
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| Abstract: | The age of the rhyolite porphyry, which is closely related to mineralization in Dongan gold deposit, is tested with LA-ICPMS zircon dating method. The results show that, the U contents of the rhyolite porphyry range from 269.1×10-6 to 956.0×10-6, while the Th contents, from 202.2×10-6 to 1276.8×10-6, with Th/U ratio between 0.43 and 1.80. The age of rhyolite porphyry is （ 109.6±1.7 ） Ma, which is synchronous with other epithermal gold deposits in the area. It implies the large-scale lithospheric extension and thinning in the late period of Early Cretaceous. |
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| Keywords: | zircon U-Pb age geological implication mineralization relationship Dongan gold deposit Heilongjiang Province |
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