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首页> 外文期刊>Quaternary geochronology >In-situ ~(230)Th/U dating of Quaternary zircons using LA-MCICPMS
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In-situ ~(230)Th/U dating of Quaternary zircons using LA-MCICPMS

机译：用LA-MCICPMS对第四纪锆石进行原位〜（230）Th / U定年

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摘要

Zircon is the most widely used mineral for geochronology purposes, as parts of it can behave as a closed system for billions of years and resist most geochemical alteration; yet, its use in Quaternary geochronology has been largely overseen, and limited to few laboratories. Here we present a new simple methodology to obtain precise and accurate ~(238)U-~(230)Th-~(232)Th composition from zircons using LAMCICPMS, which permits obtaining meaningful ages of well constrained Pleistocene and Holocene volcanic samples from Mexico. The results are compared with that of alternative instrumental techniques, such as SIMS, and other radiogenic dating methods (~(40)Ar/~(39)Ar, ~(36)Cl and ~(14)C). Our results show that the technique presented here is superior to SIMS in terms of precision, and analysis time, and equivalent in terms of sensitivity and spatial resolution. Moreover, the ~(230)Th/U ages obtained here are also consistent with those obtained by other radiogenic dating methods, as well as the geological and geochemical constrains imposed by comparing ages from different mineral phases. The ~(230)Th- ~(232)Th- ~(238)U analysis of zircons by LA-MCICPMS allows to obtain significantly richer isotope information from any set of Quaternary zircons, opening a window into the temporal evolution of crustal magma chamber.
机译：锆石是用于年代学目的的最广泛使用的矿物，因为它的一部分可以作为封闭系统存在数十亿年，并且可以抵抗大多数地球化学变化。然而，它在第四纪年代学中的使用已受到很大监督，并且仅限于少数实验室。在这里，我们介绍了一种新的简单方法，可使用LAMCICPMS从锆石中获得精确准确的〜（238）U-〜（230）Th-〜（232）Th组成，该方法可以从墨西哥获得受约束的更新世和全新世火山样品的有意义年龄。 。将结果与替代仪器技术（如SIMS）和其他放射定年方法（〜（40）Ar /〜（39）Ar，〜（36）Cl和〜（14）C）进行了比较。我们的结果表明，本文介绍的技术在精度和分析时间方面均优于SIMS，在灵敏度和空间分辨率方面均优于SIMS。此外，此处获得的〜（230）Th / U年龄也与通过其他放射定年方法获得的年龄以及通过比较不同矿物相的年龄而施加的地质和地球化学约束条件一致。通过LA-MCICPMS对锆石进行的〜（230）Th-〜（232）Th-〜（238）U分析可从任何第四纪锆石集中获得丰富得多的同位素信息，从而为了解地壳岩浆室的时间演化开辟了一个窗口。

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