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地质学报  2009 

Sr-Nd同位素初始比值和Nd模式年龄的误差估算

, PP. 1030-1038

Keywords: SrNd同位素,示踪参数,误差传播定律,精度,计算公式

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Abstract:

SrNd同位素参数广泛应用于岩石物质来源及其成因研究,但绝大多数研究者在应用这些参数时并未说明它们的误差大小,这种做法并不科学。作者首次利用误差传播定律推导出了有关参数的误差估算公式,这些参数包括Sr同位素的初始比值(??87?Sr/??86?Sr)???t??、Nd同位素的初始比值(??143?Nd/??144?Nd)???t??、ε??Sr?(?t?)、ε??Nd?(?t?)、Nd同位素模式年龄等。Rb、Sr含量的高低及其测定误差决定着(??87?Rb/??86?Sr)???s??的误差,Sm、Nd含量的高低及其测定误差决定着(??147?Sm/??144?Nd)???s??的误差,(??87?Rb/??86?Sr)???s??的大小及其误差、(??87?Sr/??86?Sr)???s??误差、年龄值大小及其误差共同影响着(??87?Sr/???86?Sr?)???t??的误差。同样,(??147?Sm/??144?Nd)???s??的大小及其误差、(??143?Nd/??144?Nd)???s??的误差、年龄值大小及其误差共同影响着(???143?Nd/???144?Nd)???t??的误差。Nd同位素球粒陨石模式年龄?T???CHUR?和单阶段亏损地幔模式年龄?T???DM?的误差影响因素主要包括(??147?Sm/??144?Nd)???s??的大小、(??143?Nd/??144?Nd)???s??的大小及这两个比值的误差,而Nd同位素两阶段亏损地幔模式年龄T??DM2?的误差除上述影响因素之外,还包括年龄值大小及其误差。通过对广西姑婆山4个花岗岩样品SrNd同位素参数及其误差的计算,作者对各个影响因素进行了详细分析,认为采用同位素稀释质谱法测试数据和高精度的年龄数据是获得理想示踪参数的保证,Rb、Sr、Sm、Nd含量沿用微量(包括稀土)元素测试结果的做法是不可取的,对高Rb样品更应该谨慎从事。建议研究者在使用SrNd同位素参数时能够估算这些参数的误差,并在文章中有所说明。

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