辉钼矿Re-OS同位素定年前处理方法改进
An Improved Sample-preparation Method for the Re-Os Isotopic Dating of Molybdenite
查看参考文献21篇
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文摘
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辉钼矿Re-Os同位素定年是热液矿床成矿年龄的经典定年方法。卡洛斯管在室温条件下密封时,有时会出现年龄偏大情况,推测为因OsO_4具有挥发性而使加入的同位素稀释剂中的Os发生部分挥发而导致。本文对辉钼矿Re-Os同位素定年前处理过程中的同位素稀释剂加入方法进行了改进,通过单独用小玻璃管盛放稀释剂,避免了因卡洛斯管密封前稀释剂与酸直接接触所造成的稀释剂Os的挥发损失,改进后可在常温下操作完成加酸与密封卡洛斯管的流程。此外,温度实验结果表明,在溶样时间为6 h、溶样温度为180 ℃的条件下用改进方法处理后的样品仍然能够得到较为理想的定年结果;而当溶样温度降至160 ℃,溶样时间为6 h的条件下用改进方法处理后的样品进行定年的结果偏离真实值且不稳定。运用本文改进的方法对辉钼矿标样JDC进行了测定,结果显示该方法是稳定可靠的。 |
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其他语种文摘
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The Re-Os isotopic dating of molybdenite is a classic method for dating the ore-forming ages of hydrothermal deposits. When the Carius tube was sealed at normal room temperature,the dating result of the prepared sample sometimes appears to be older than its true age. It is inferred that this could be resulted from the partial volatilization of Os from added spike in the Carus tube sealing process of the sample with added spike due to the volatility of OsO_4. In this paper,we have improved the method for adding isotope spike into a Carius tube in the sample pre-preparation process for the Re-Os isotopic dating of molybdenite. The isotopic spike was added independently into a small glass tube which was then put into the sample solution-contained Carius tube for sealing at room temperature. This new method can result in the avoidance of the partial loss of Os in spike due to the volatility of OsO_4 which was formed by the direct contact of added spike with added HNO_3 in the Carius tube before its sealing. Then the addition of acid into Carius tube and the sealing of Carius tube can be performed at room temperature. In addition,our experimental results also show that relatively ideal dating results can be obtained for the sample which had been dissolved at 180 ℃ for 6 hours,whereas only the unstable dating results deviated from the real values can be obtained for the sample which had been dissolved at 160 ℃ for 6 hours. The dating results for the molybdenite reference material JDC treated by using the newly improved method are in good agreement with the certified values,indicating that the method is stable and reliable. |
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来源
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矿物岩石地球化学通报
,2022,41(4):849-853 【核心库】
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DOI
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10.19658/j.issn.1007-2802.2022.41.036
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关键词
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Re-OS同位素
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辉钼矿
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分析测试
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前处理方法
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地址
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1.
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
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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文献收藏号
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CSCD:7304399
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