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首页> 外文期刊>Contributions to Mineralogy and Petrology >Experimental simulation of magma-carbonate interaction beneath Mt. Vesuvius, Italy
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Experimental simulation of magma-carbonate interaction beneath Mt. Vesuvius, Italy

机译：山下岩浆-碳酸盐岩相互作用的实验模拟。意大利维苏威

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We simulated the process of magma-carbonate interaction beneath Mt. Vesuvius in short duration piston-cylinder experiments under controlled magmatic conditions (from 0 to 300 s at 0.5 GPa and 1,200℃), using a Vesuvius shoshonite composition and upper crustal limestone and dolostone as starting materials. Backscattered electron images and chemical analysis (major and trace elements and Sr isotopes) of sequential experimental products allow us to identify the textural and chemical evolution of carbonated products during the assimilation process. We demonstrate that melt-carbonate interaction can be extremely fast (minutes), and results in dynamic contamination of the host melt with respect to Ca, Mg and ~(87)Sr/~(86)Sr, coupled with intense CO_2 vesiculation at the melt-carbonate interface. Binary mixing between carbonate and uncontaminated melt cannot explain the geo-chemical variations of the experimental charges in full and convection and diffusion likely also operated in the charges. Physical mixing and mingling driven by exsolving volatiles seems to be a key process to promote melt homogenisation. Our results reinforce hypotheses that magma-carbonate interaction is a relevant and ongoing process at Mt. Vesuvius and one that may operate not only on a geological, but on a human timescale.
机译：我们模拟了山下的岩浆-碳酸盐相互作用的过程。维苏威火山在短时活塞缸实验中，在受控的岩浆条件下（0.5 GPa和1200℃，从0到300 s），以维苏威火山shoshonite成分和上地壳石灰石和白云岩为起始原料。顺序实验产品的反向散射电子图像和化学分析（主要和痕量元素以及Sr同位素）使我们能够确定同化过程中碳酸化产物的质构和化学演化。我们证明，熔体与碳酸盐的相互作用可能非常快（数分钟），并导致主体熔体相对于Ca，Mg和〜（87）Sr /〜（86）Sr的动态污染，以及在熔体处强烈的CO_2囊泡化。熔融碳酸盐界面。碳酸盐和未污染熔体之间的二元混合无法解释实验装料的地球化学变化，对流和扩散也可能在装料中起作用。通过溶解挥发物驱动的物理混合和混合似乎是促进熔体均质化的关键过程。我们的结果进一步证实了岩浆-碳酸盐相互作用是山中一个相关且持续的过程的假设。维苏威火山不仅可以在地质上运行，而且可以在人类时间尺度上运行。

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