原位U-Th/He同位素定年技术研究进展及其低温矿床学应用前景
Progress of in situ U-Th/He Isotopic Dating Technique and Its Application to Low Temperature Deposits
查看参考文献102篇
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文摘
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应用传统单颗粒方法对目标矿物进行定年具有较高要求(如U、Th等母体同位素均匀分布),需要耗时的酸溶过程,同时还需进行α粒子射出效应校正。原位U-Th/He同位素定年技术是近年发展起来的一种定年技术,其主要原理是采用激光加热目标矿物,并通过与激光系统连接的稀有气体质谱(Alphachron)和电感耦合等离子体质谱(ICP-MS)分别完成~4He和U、Th等母体同位素分析,将~4He和U、Th分析结果代入年龄公式计算即可获得目标矿物的U-Th/He年龄。本文阐述了原位U-Th/He同位素定年技术的主要原理、实验测试流程、适用矿物等,重点对原位U-Th/He同位素定年的技术难点和低温矿床学应用前景进行了分析。相对于传统单颗粒方法,原位测试方法解决了两个关键问题:①无需进行α粒子射出效应的校正,提高了定年结果的可靠性和准确度;②能完成母体同位素分布不均匀样品的测试,扩展了U-Th/He同位素定年的应用范围。尽管原位U-Th/He同位素定年技术在侧向加热效应、剥蚀坑体积测定以及标准矿物等方面尚存在一些亟待解决的问题,但已在硅酸盐、磷酸盐、钛铁氧化物等矿物的年代学研究方面展示了良好的应用前景。随着原位U-Th/He同位素定年技术的发展和进步,尤其是硫化物的U-Th/He同位素定年的发展,将为解决低温矿床的年代学问题提供一种新的思路。 |
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其他语种文摘
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The traditional single-grain U-Th/He isotopic dating method a uses time-consuming acid dissolution, correction for α-ejection and more requirements on target minerals(euhedral, transparent, no cracks or inclusions). In situ U-Th/He isotopic dating is a newly developed dating technique, which uses extracted ~4He from target mineral by laser ablation system and analyzes the ~4He and U, Th and other parent isotopes via the Noble Gas Mass Spectrum (Alphachron) coupled with laser system and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The U-Th/He age of the deposits can be acquired by an age calculation formula using the analytical results of ~4He, U, and Th isotopes. The principles, analytical processes, and minerals suitable for dating, technique difficulty and application prospect in low-temperature mineral deposits, are presented in this paper. In situ U-Th/He dating technique solved two key problems compared to traditional single-grain method: (1)Correction of α-ejection is unnecessary, improving the reliability and accuracy of dating results, and (2) Overcoming the bias from heterogeneous distribution of parent isotopes (U, Th), enlarging the range of U-Th/He isotopic dating. Although the in situ U-Th/He isotopic dating technique still needs to address issues such as collateral heating, precise measurement of pit volume and standard materials, it has shown itself to be a promising prospect for silicates, phosphates and Fe-Ti oxides. With the improvement of the in situ U-Th/He isotopic dating technique, particularly the U-Th/He isotopic dating of hydrothermal sulfides, this technique will provide a better way to date low-temperature mineralization. |
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来源
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岩矿测试
,2017,36(1):1-13 【核心库】
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DOI
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10.15898/j.cnki.11-2131/td.2017.01.002
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关键词
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原位U-Th/He定年
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单颗粒U-Th/He定年
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原位分析
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低温矿床定年
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地址
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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, 贵州, 贵阳, 550081
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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0254-5357 |
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学科
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地质学 |
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基金
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国家自然科学基金重点项目
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国家973计划
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文献收藏号
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CSCD:5963873
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