| 含有普通锇的辉钼矿Re-Os同位素定年研究 |
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| 引用本文： | 李超,屈文俊,杜安道,周利敏.含有普通锇的辉钼矿Re-Os同位素定年研究[J].岩石学报,2012,28(2):702-708. |
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| 作者姓名： | 李超 屈文俊 杜安道 周利敏 |
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| 作者单位： | 1. 国家地质实验测试中心,北京,100037
2. 中国地质科学院地质研究所,北京100037;中国地质科学院研究生部,北京100037 |
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| 基金项目： | 本文受国家自然科学基金重点项目(41030421)和国家自然科学基金项目(40972070)联合资助. |
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| 摘 要： | 通过大量数据统计,表明较高比例的辉钼矿中存在普通锇。普通锇可能以类质同像形式存在于辉钼矿样品中,理论上辉钼矿中可能含有较高含量普通锇。辉钼矿样品含有较高含量普通锇可能对Re-Os定年结果产生很大影响,从原理上并结合实例证实了普通锇含量对辉钼矿Re-Os年龄影响程度。对于一般辉钼矿样品来讲,如果187Os总量(放射成因187Os与非放射成因187Os之和)与普通锇比值小于20,需要考虑普通锇对Re-Os模式年龄的影响,并提出了对于含有普通锇辉钼矿模式年龄的计算方法。先做出187Os/188Os-187Re/188Os等时线,求得初始187Os/188Os值,再根据初始187Os/188Os值和单个样品的普Os含量求得非放射成因的普Os中187Os的量。最后根据Re含量以及放射成因187Os含量得到模式年龄。
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| 关 键 词： | 辉钼矿 Re-Os 定年 普通Os |
| 收稿时间： | 2011/11/7 0:00:00 |
| 修稿时间： | 1/8/2012 12:00:00 AM |
Study on Re-Os isotope in molybdenite containing common Os |
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| LI Chao,QU WenJun,DU AnDao and ZHOU LiMin.Study on Re-Os isotope in molybdenite containing common Os[J].Acta Petrologica Sinica,2012,28(2):702-708. |
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| Authors: | LI Chao QU WenJun DU AnDao and ZHOU LiMin |
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| Institution: | National Center of Rock and Mineral Analysis, CAGS, Beijing 100037, China;National Center of Rock and Mineral Analysis, CAGS, Beijing 100037, China;National Center of Rock and Mineral Analysis, CAGS, Beijing 100037, China;Institute of Geology, CAGS, Beijing 100037, China;Graduate Department, CAGS, Beijing 100037, China |
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| Abstract: | A number of statistics indicate that high content common Os universally occur in the molybdenite which is different from the previous study results. The common Os may occur in molybdenite as substitution atoms, therefore the molybdenite containing high content common Os has possibility in principle. Many analysis results demonstrate that high content common Os in the molybdenite may significantly affects the Re-Os model age. For most of molybdenite, the influence of common Os on the Re-Os model age cannot be ignored in case of OsCommon /187Os Total<20, and the Re-Os model age should be calculated based on the method given in the paper rather than directly using the decay formula. 187Os/188Os-187Re/188Os isochron is made to obtain the initial187Os/188Os value, then the non-radiogenic 187Os in total Os is obtained according to the initial 187Os/188Os value and single sample common Os content. Model age is got according to the Re content and radiogenic 187Os content finally. |
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| Keywords: | Molybdenite Re-Os isotopic system Dating Common Os |
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