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首页> 外文期刊>Contributions to Mineralogy and Petrology >Time evolution of chemical exchanges during mixing of rhyolitic and basaltic melts
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Time evolution of chemical exchanges during mixing of rhyolitic and basaltic melts

机译：流纹和玄武质熔体混合过程中化学交换的时间演变

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摘要

We present the first set of chaotic mixing experiments performed using natural basaltic and rhyolitic melts. The mixing process is triggered by a recently developed apparatus that generates chaotic streamlines in the melts, mimicking the development of magma mixing in nature. The study of the interplay of physical dynamics and chemical exchanges between melts is carried out performing time series mixing experiments under controlled chaotic dynamic conditions. The variation of major and trace elements is studied in detail by electron microprobe and Laser Ablation ICP-MS. The mobility of each element during mixing is estimated by calculating the decrease in the concentration variance in time. Both major and trace element variances decay exponentially, with the value of exponent of the exponential function quantifying the element mobility. Our results confirm and quantify how different chemical elements homogenize in the melt at differing rates. The differential mobility of elements in the mixing system is considered to be responsible for the highly variable degree of correlation (linear, nonlinear, or scattered) of chemical elements in many published inter-elemental plots. Elements with similar mobility tend to be linearly correlated, whereas, as the difference in mobility increases, the plots become progressively more nonlinear and/or scattered. The results from this study indicate that the decay of concentration variance is in fact a robust tool for obtaining new insights into chemical exchanges during mixing of silicate melts. Concentration variance is (in a single measure) an expression of the influence of all possible factors (e.g., viscosity, composition, and fluid dynamic regime) controlling the mobility of chemical elements and thus can be an additional petrologic tool to address the great complexity characterizing magma mixing processes.
机译：我们介绍了使用天然玄武岩和流纹岩熔体进行的第一组混沌混合实验。混合过程由最近开发的设备触发，该设备在熔体中产生混乱的流线，模仿了自然界中岩浆混合的发展。熔体之间的物理动力学和化学交换之间相互作用的研究是在受控的混沌动力学条件下进行时间序列混合实验进行的。通过电子探针和激光烧蚀ICP-MS详细研究了主要元素和痕量元素的变化。通过计算浓度随时间变化的减少来估计混合期间每种元素的迁移率。主要元素和痕量元素方差均呈指数衰减，而指数函数的指数值可量化元素迁移率。我们的结果证实并量化了不同化学元素在熔体中以不同速率均匀化的方式。元素在混合系统中的差异迁移率被认为是导致许多公开的元素间图谱中化学元素的高度相关性（线性，非线性或分散）的原因。具有相似迁移率的元素趋向于线性相关，而随着迁移率差异的增加，曲线逐渐变得更加非线性和/或分散。这项研究的结果表明，浓度方差的衰减实际上是一种强大的工具，可用于在硅酸盐熔体混合过程中获得有关化学交换的新见解。浓度方差（单一度量）表示控制化学元素迁移率的所有可能因素（例如，粘度，组成和流体动力学状态）的影响的表达式，因此可以作为解决复杂性表征的附加岩石学工具岩浆混合过程。

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