| 半封闭硝酸溶解体系ICP-MS快速测定辉钼矿的Re-Os年龄及Re含量 |
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| 引用本文： | 杨雪,李超,李欣尉,杜安道,周利敏,屈文俊.半封闭硝酸溶解体系ICP-MS快速测定辉钼矿的Re-Os年龄及Re含量[J].岩矿测试,2016,35(1):24-31. |
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| 作者姓名： | 杨雪 李超 李欣尉 杜安道 周利敏 屈文俊 |
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| 作者单位： | 青岛科技大学化学与分子工程学院, 山东 青岛 266042;国家地质实验测试中心, 北京 100037,国家地质实验测试中心, 北京 100037;中国地质科学院Re-Os同位素地球化学重点实验室, 北京 100037,国家地质实验测试中心, 北京 100037;中国地质科学院Re-Os同位素地球化学重点实验室, 北京 100037,国家地质实验测试中心, 北京 100037;中国地质科学院Re-Os同位素地球化学重点实验室, 北京 100037,国家地质实验测试中心, 北京 100037;中国地质科学院Re-Os同位素地球化学重点实验室, 北京 100037,国家地质实验测试中心, 北京 100037;中国地质科学院Re-Os同位素地球化学重点实验室, 北京 100037 |
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| 基金项目： | 国家自然科学基金项目(41203037);国土资源地质大调查项目(12120113015500) |
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| 摘 要： | Re-Os法能够直接厘定内生金属矿床成矿时代,但是封闭Carius管法化学流程复杂,且有一定的危险性。本文建立了一种简便快速测定辉钼矿Re-Os年龄及其Re含量的方法。用3 mL浓硝酸在10 mL比色管中溶解5~15 mg辉钼矿样品,将溶液中的钼酸沉淀分离后稀释定容,直接采用质谱测量187和185质量数比值(M187/M185)。利用辉钼矿Re-Os年龄标准物质JDC和HLP的M187/M185值与其年龄的正相关线性关系计算未知辉钼矿样品的Re-Os年龄,并通过185Re计数利用相对法计算Re含量。本方法应用于测量13.26~2130 Ma的辉钼矿,Re-Os年龄的测定值与推荐值的相对偏差多数在0.36%~7.42%之间,由于放射性积累较多,长年龄样品测量的准确度较高。与传统Carius管法相比,该方法不需要加入稀释剂,省去了封闭和打开Carius管环节以及Re-Os分离纯化流程,适合于辉钼矿Re-Os年龄的初步分析。
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| 关 键 词： | 辉钼矿 Re-Os年龄 Re含量 187和185质量数比值 电感耦合等离子体质谱法 |
| 收稿时间： | 2015/3/17 0:00:00 |
| 修稿时间： | 1/5/2016 12:00:00 AM |
A Rapid Method to Determine the Re-Os Age and Re Content of Molybdenite by Inductively Coupled Plasma-Mass Spectrometry |
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| YANG Xue,LI Chao,LI Xin-wei,DU An-dao,ZHOU Li-min and QU Wen-jun.A Rapid Method to Determine the Re-Os Age and Re Content of Molybdenite by Inductively Coupled Plasma-Mass Spectrometry[J].Rock and Mineral Analysis,2016,35(1):24-31. |
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| Authors: | YANG Xue LI Chao LI Xin-wei DU An-dao ZHOU Li-min and QU Wen-jun |
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| Institution: | College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;National Research Center for Geoanalysis, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China;Key Laboratory of Re-Os Isotope Geochemistry, Chinese Academy of Geological Sciences, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China;Key Laboratory of Re-Os Isotope Geochemistry, Chinese Academy of Geological Sciences, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China;Key Laboratory of Re-Os Isotope Geochemistry, Chinese Academy of Geological Sciences, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China;Key Laboratory of Re-Os Isotope Geochemistry, Chinese Academy of Geological Sciences, Beijing 100037, China and National Research Center for Geoanalysis, Beijing 100037, China;Key Laboratory of Re-Os Isotope Geochemistry, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | Re-Os isotope method is a powerful tool for dating ore deposits,but digesting samples with the Carius tube is complicated and dangerous.A simple and quick method to determine the age of molybdenite Re-Os and Re content has been established.5-15 mg of molybdenite samples were digested with 3 mL HNO3 in a 10 mL colorimetric cylinder.Molybdic acid in solution was removed by a centrifuge,the supernatant of the solution was then diluted to an appropriate volume.M187/M185 ratio of the resulting solution was determined directly by Inductively Coupled Plasma-Mass Spectrometry(ICP-MS).According to the principle of radioactive decay,it can be inferred that the mass ratio is positively correlated with the age.The Re-Os age of the sample can be calculated by comparing with the M187/M185 ratio of the molybdenite standard material(JDC and HLP).The Re content in the sample can be calculated on the basis of 185Re counting using the relative method.In order to test the reliability of this method,a series of molybdenite samples,whose ages vary from 13.26 Ma to 2130 Ma,were analyzed.The resulting ages were generally identical to the reference ages within 0.36%-7.42% deviations.The samples with older ages yield better results because the 187Os is more radiogenic.This method,without spike addition,can avoid the trouble of sealing and opening the Carius tube and the process of separating and purifying Re and Os,which significantly improves the experimental efficiency.This simple and quick method is highly suitable for the preliminary analysis of molybdenite Re-Os ageing. |
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| Keywords: | molybdenite Re-Os Dating Re content M187/M185 mass ratio Inductively Coupled Plasma-Mass Spectrometry |
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