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| 辉钼矿Re-Os同位素定年方法的改进与应用 | |
| 引用本文： | 李晶,孙亚莉,何克,冼伟胜,仇建军,张旭.辉钼矿Re-Os同位素定年方法的改进与应用[J].岩石学报,2010,26(2):642-648. |
| 作者姓名： | 李晶 孙亚莉 何克 冼伟胜 仇建军 张旭 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,广州 510640;中国科学院研究生院,北京100049 2. 中国科学院广州地球化学研究所,广州,510640 3. 长安大学成矿作用及其动力学开放研究实验室,西安,710054 4. 河南省有色金属地质矿产局,郑州,450052 |
| 基金项目： | 国家重点基础研究发展规划项目(2007CB411303)及中国科学院“百人计划”和“创新团队国际合作伙伴计划(KZCX2-YW-T004)”联合资助 |
| 摘 要： | 公认的Re-Os同位素定年代表物辉钼矿,目前已在金属硫化物矿床年代学研究领域获得了广泛的应用。本研究采用浓HNO3分解辉钼矿样品,大大地简化了Re和Os的化学制备过程,并根据辉钼矿中正常Os含量水平相对放射成因187Os可以忽略的特点,以正常Os标准为稀释剂,实现了仪器测量过程中Os同位素质量分馏的在线校正,改善了分析数据的质量。该方法经辉钼矿国家标准物质进行验证,获得了满意的Re、Os含量及Re-Os年龄数据,并且在南岭地区与连阳复式岩体相关的姓坪夕卡岩型钼矿床成矿年龄研究中获得了成功应用。在实际应用中,为了获得有意义的能反映真实地质事件的年龄数据,辉钼矿样品不仅要有足够的取样量,而且还要保证粒度细、混合均匀。 |
| 关 键 词： | Re-Os同位素体系 辉钼矿 姓坪钼矿 连阳岩体 |
| 收稿时间： | 2009/4/29 0:00:00 |
| 修稿时间： | 2009/7/17 0:00:00 |
The improved molybdenite Re-Os dating method and its application |
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| Li J,Sun YL,He K,Xian WS,Qiu JJ and Zhang X.The improved molybdenite Re-Os dating method and its application[J].Acta Petrologica Sinica,2010,26(2):642-648. | |
| Authors: | Li J Sun YL He K Xian WS Qiu JJ and Zhang X |
| Institution: | Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;The Laboratory of Mineralization and Dynamics, Chang'an University, Xi'an 710054, China;Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Henan Provincial Bureau for Nonferrous Metal Mineral Resources, Zhengzhou 450052, China;Henan Provincial Bureau for Nonferrous Metal Mineral Resources, Zhengzhou 450052, China |
| Abstract: | As a robust proxy, molybdenite has been widely applied to determination of Re-Os age. This study simplified the chemical separation of Re and Os using concentrated HNO3 for digestion of molybdenite. Based on the negligible level of common Os relative to radiogenetic 187Os in molybdenite, a common Os standard was used as spike, and as a result, Os isotopic mass fractionation during ICP-MS measurements could be on-line corrected, improving the quality of analytical data. This method was validated using national certified molybdenite standards, and the results were well consistent with the certified values. Using this method for determination of molybdenite sampled from Xingping skarn-type Mo deposit, Liangyang granite composite, reasonable Re-Os age data have been obtained. In practice, it is suggested to use enough amounts of molybdenite, which should be homogenized fine-grain in order to obtain representative Re-Os age. |
| Keywords: | Re-Os isotope system Molybdenite Xingping molybdenum deposits Lianyang granite composite |
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