首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >’New ~(40)Ar/~(39)Ar dating of the Grande Ronde lavas, Columbia River Basalts, USA: Implications for duration of flood basalt eruption episodes‘ by Barry et al. (2010) - Discussion
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’New ~(40)Ar/~(39)Ar dating of the Grande Ronde lavas, Columbia River Basalts, USA: Implications for duration of flood basalt eruption episodes‘ by Barry et al. (2010) - Discussion

机译:Barry等人的“美国哥伦比亚河玄武岩大朗德熔岩的新〜(40)Ar /〜(39)Ar年代:对洪水玄武岩喷发持续时间的影响”。 (2010)-讨论

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Barry et al. (2010) presented ~(40)Ar/~(39)Ar ages to argue for a very limited duration (~ 0.4 ray.) for the eruption of the Grande Ronde lavas. Critical examination of their data sets shows (1) a number of their plateau ages are statistically invalid and (2) many of their groundmass matrix samples were altered, and did not yield valid estimates of the time of crystallization. In general, their ages err on the young side, reflecting partial ~(40)Ar * loss, due to alteration, and there is no compelling evidence therein, to argue for very limited duration for the Grande Ronde Basalt The Imnaha, Grande Ronde and Wanapum Basalt erupted within~0.7 m.y., starting at~16.4 Ma. By contrast, the "ages" of Barry et al. (2010) span the interval~16.6 to~14.7 Ma and, in some instances, are out of stratigraphic sequence.
机译:巴里等。 (2010)提出了〜(40)Ar /〜(39)Ar年龄,认为隆德熔岩喷发的持续时间非常有限(〜0.4射线)。对其数据集进行的严格检查显示:(1)他们的多个平稳年龄在统计学上是无效的,并且(2)他们的许多地面质量矩阵样本发生了变化,并且没有得出有效的结晶时间估算值。通常,他们的年龄偏年轻,反映出由于改变而造成的部分〜(40)Ar *损失,并且其中没有令人信服的证据,因此可以为格兰德·朗德·玄武岩,伊姆纳哈,格兰德·朗德和瓦纳普玄武岩在〜1.6 Ma内爆发,距我约0.7 my。相比之下,巴里等人的“年龄”。 (2010)的跨度在16.6〜14.7Ma之间,在某些情况下不属于地层层序。

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