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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 >Radial variations of melt viscosity around growing bubbles and gas overpressure in vesiculating magmas
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Radial variations of melt viscosity around growing bubbles and gas overpressure in vesiculating magmas

机译：气泡状熔岩周围气泡和气体超压周围熔体粘度的径向变化

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摘要

The viscosity of silicic melts depends strongly on their water content. As bubbles grow in a supersaturated melt, water evaporates from the bubble-melt interface. A diffusive profiles develops and leads to steep viscosity gradients across the melt shell. Here we investigate the effects of radial viscosity profiles on the dynamics of bubble growth. We find that the effective melt viscosity resisting gas overpressure in the bubbles is close to the viscosity at the dehydrated rind, and may be higher than that of the surrounding melt by more than an order of magnitude. As a result, bubbles may retain pressures that are higher than ambient pressure for longer times, magma degassing is delayed to shallower depth, and fragmentation of magma due to gas overpressure may occur over a wider range of conditions. Measured water content in eruption products yields information on the average melt viscosity, however additional information about the concentration profiles is needed for estimating the effective viscosity that controlled the evolution of bubble growth in the ejecta.
机译：硅质熔体的粘度在很大程度上取决于其水含量。当气泡在过饱和熔体中生长时，水会从气泡熔体界面蒸发。会形成扩散曲线，并导致整个熔体壳出现陡峭的粘度梯度。在这里，我们研究了径向粘度分布对气泡生长动力学的影响。我们发现气泡中抵抗气体超压的有效熔体粘度接近脱水皮的粘度，并且可以比周围熔体的粘度高一个数量级以上。结果，气泡可能会在更长的时间内保持高于环境压力的压力，岩浆脱气被延迟到更浅的深度，并且由于气体超压导致的岩浆破碎可能会在更宽的条件范围内发生。测出的喷发产物中的水含量可得出有关平均熔体粘度的信息，但是，需要有关浓度分布的其他信息来估算控制喷射器中气泡生长的有效粘度。

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