RELIABLE RE-OS AGE FOR MOLYBDENITE

被引：40
|
作者：
SUZUKI, K
QILU
SHIMIZU, H
MASUDA, A
机构：
[1] UNIV ELECTROCOMMUN,DEPT CHEM,CHOFU,TOKYO 182,JAPAN
[2] KUMAMOTO UNIV,FAC SCI,DEPT EARTH SCI,KUMAMOTO 860,JAPAN
来源：
GEOCHIMICA ET COSMOCHIMICA ACTA | 1993年 / 57卷 / 07期
关键词：
D O I：
10.1016/0016-7037(93)90021-N
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Re-Os ages for four molybdenites were determined by our newly developed method with isotope dilution-mass spectrometry. Special caution was given to achieve osmium isotopic equilibration between sample and ''spike'' during chemical treatment. Re-Os data for molybdenites from Mt. Mulgine (Australia), Matasvaara (Finland), Preissac (Canada), and Climax (USA) define ages of 2790 Ma, 2600 Ma, 2680 Ma, and 26.6 Ma, respectively. The reproducibilities of our Re-Os age determination are shown to be within 2% by the replicate analyses for Mt. Mulgine, Matasvaara, and Preissac samples. The ages obtained are in good agreement with reference ages estimated for wall rocks of molybdenite deposits concerned. Thus, with careful experimental procedure, it appears that the Re-Os geochronometer can be used to reliably determine the age of molybdenite.
引用
收藏
页码：1625 / 1628
页数：4
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