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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Magma recharge, contamination and residence times revealed by in situ laser ablation isotopic analysis of feldspar in volcanic rocks
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Magma recharge, contamination and residence times revealed by in situ laser ablation isotopic analysis of feldspar in volcanic rocks

机译：火山岩中长石的原位激光烧蚀同位素分析揭示了岩浆充注，污染和停留时间

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摘要

We illustrate a rapid and effective method for determining variation in ~(87)Sr/~(86)Sr across single plagioclase feldspar crystals using laser ablation interfaced to a multicollector inductively coupled plasma source mass spectrometer. The speed of analysis proves to be a particular advantage permitting representative populations of crystals to be characterized, or enabling reconnaissance analysis of rocks to test for mineral-scale isotopic heterogeneity. Our results from magmatic crystals in lavas from El Chichon volcano confirm trends previously obtained by the more time-consuming microdrilling method. For the first time with confidence, the laser data allow us to associate abrupt changes in ~(87)Sr/~(86)Sr with distinct petrographic discontinuities such as dissolution surfaces in the crystal. Because the isotopic variations within crystals would be expected to equilibrate diffusively with time, the width over which abrupt changes in ~(87)Sr/~(86)Sr occur can also be used to constrain timescales at which the crystal has been held at magmatic temperatures.
机译：我们说明了一种快速有效的方法，该方法使用与多收集器电感耦合等离子体源质谱仪连接的激光烧蚀来确定单个斜长石长晶中〜（87）Sr /〜（86）Sr的变化。分析速度证明是一个特别的优势，它可以表征典型的晶体种群，或者可以对岩石进行侦察分析以测试矿物级同位素异质性。我们从El Chichon火山熔岩中的岩浆晶体获得的结果证实了以前通过耗时的微钻孔方法获得的趋势。激光数据首次使我们有信心地将〜（87）Sr /〜（86）Sr的突然变化与独特的岩相学不连续性（例如晶体中的溶蚀表面）联系起来。因为预计晶体中的同位素变化会随时间扩散扩散，所以〜（87）Sr /〜（86）Sr发生突然变化的宽度也可以用来限制将晶体保持在岩浆状态的时间尺度温度。

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