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矿床地质  2005 

两阶段铅演化体系μ值的计算

Keywords: 地球化学,铅同位素,二次等时线,μ1值计算,地质实例

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Abstract:

异常铅二次等时线是普通铅同位素地质学研究中非常重要的一个课题。在解释二次等时线时,当铅源岩年龄确定后,如何计算铅源岩的μ值是个经常遇到的问题。文章详尽地介绍了计算μ1值的3种方法:①先求μ2法;②先求T164法;③图解法。对这3种方法分别以实例予以说明。

References

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[3]  该公式由David R. Nelson提供. 2002. 私人通信. 其来龙去脉及推导过程由作者自己完成.
[4]  因该点明显偏离异常铅二次等时线,若以T264值为准,则T274应取二次等时线上相应点的坐标值,即T274=R·T264+Y(见前述).
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