| 铀矿床定年研究进展评述 |
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| 引用本文： | 骆金诚,石少华,陈佑纬,田建吉.铀矿床定年研究进展评述[J].岩石学报,2019,35(2):589-605. |
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| 作者姓名： | 骆金诚 石少华 陈佑纬 田建吉 |
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| 作者单位： | 中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081,湖南省地质调查院, 长沙 410116,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081,核工业北京地质研究院, 北京 100029 |
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| 基金项目： | 本文受国家重点研发计划（2016YFC0600405）、国家自然科学基金项目（41603051、41873057）和贵州省基金项目（黔科合基础[2018]1423）联合资助. |
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| 摘 要： | 往往由于铀矿物(沥青铀矿)颗粒细小、易蚀变成铀的次生矿物及多期铀矿化作用相互叠加等在组成和结构上的固有特点,通常难以用挑选铀矿物(沥青铀矿)样品溶样的传统定年方法精确确定其形成年龄。随着分析技术的不断更新和发展,对铀矿床成矿年代学的研究也不断深入。但受铀矿床中铀矿物U-Pb定年方法本身的制约,以及以往对铀矿物U-Pb定年体系中铀矿物样品要求认识的不足,常常导致获得的年龄无实际地质意义或无法获得理想的等时线年龄。本文针对铀矿化定年方法的发展历程进行了系统梳理和分析,评述了铀矿物定年的五种主要方法:(1)铀矿物U-Th-totalPb化学年龄;(2)铀矿物模式年龄;(3)铀矿物传统等时线年龄;(4)铀矿物矿伴生矿物年龄;(5)原位微区铀矿物U-Pb年龄。在此基础上,深入探讨了铀矿化作用定年研究中存在的问题和对应方案,期望促进未来铀矿床成矿年代学的发展。
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| 关 键 词： | 铀矿物 年代学 定年方法 研究现状 |
| 收稿时间： | 2018/9/11 0:00:00 |
| 修稿时间： | 2018/11/8 0:00:00 |
Review on dating of uranium mineralization |
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| LUO JinCheng,SHI ShaoHu,CHEN YouWei and TIAN JianJi.Review on dating of uranium mineralization[J].Acta Petrologica Sinica,2019,35(2):589-605. |
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| Authors: | LUO JinCheng SHI ShaoHu CHEN YouWei and TIAN JianJi |
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| Institution: | State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China,Hunan Institute of Geological Survey, Changsha 410116, China,State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China and Beijing Research Institute of Uranium Geology, Beijing 100029, China |
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| Abstract: | The accurate and precise ages of uranium mineralization are scarce because those uranium minerals (pitchblendes) usually show heterogeneous and fine grains in component and structure, and may have formed in several stages. The conventional bulk uranium minerals (pitchblendes) U-Pb dating methods previously employed were unable to avoid alteration minerals and precisely discriminate different stages of uranium mineralization to obtain the precise ore-forming ages. With the constant improvement and development of analytical techniques, ore-forming age of uranium mineralization has been extensively studied. However, the insufficient understanding on constraint for uranium mineral U-Pb dating techniques, and uranium mineral requirement for U-Pb dating systems commonly resulted in that either the obtained ages were geological meaningless or the isochron ages were failure to be constructed. This paper presents the development process of analysis methods for ore-forming ages of uranium mineralization in detail. These main dating methods include:(1) uranium mineral U-Th-totalPb chemical age; (2) uranium mineral U-Pb model age; (3) conventional uranium mineral U-Pb isochron age; (4) uranium mineral associated with other minerals dating; and (5) in-situ uranium mineral U-Pb dating. Additionally, we also review these issues on various dating techniques of uranium mineralization and propose some items for future development of metallogenic geochronology on uranium deposit. |
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| Keywords: | Uranium minerals Geochronology Dating methods Current research |
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