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首页> 外文期刊>The American mineralogist >In situ bubble vesiculation in silicic magmas
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In situ bubble vesiculation in silicic magmas

机译：硅质岩浆中的原位泡沫囊泡

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Volatile degassing is a major process driving volcanic eruptions. Therefore, a full understanding of mechanisms ranging from bubble nucleation, growth, coalescence, to magma fragmentation is required. We have simulated magma degassing during ascent in the volcanic conduit by depressurizing hydrated haplogranite melts in high-pressure and high-temperature optical cells (a hydrothermal diamond-anvil cell and an internally heated pressure vessel fitted with sapphire windows). This allowed the whole process of bubble nucleation, growth, and coalescence to be directly observed in situ through images captured from the recording videos. Bubble nucleation pressures, number densities, growth laws, and characteristics of coalescence were estimated as a function of melt water content, decompression rate, and temperature. Melt/vapor surface tension during bubble nucleation and coalescence was calculated. Our data show good agreement with those previously obtained in classical vessels. Methodological improvements are proposed for the experimental simulation of magma degassing in volcanic conduits.
机译：挥发性脱气是驱动火山喷发的主要过程。因此，需要对从气泡成核，生长，聚结到岩浆碎裂的机制有充分的了解。我们通过对高压和高温光学电池（水热金刚石-铁砧电池和装有蓝宝石窗的内部加热压力容器）中的水合高辉石熔体减压，模拟了火山管道上升过程中的岩浆脱气。这样就可以通过从录制视频中捕获的图像直接原位观察气泡成核，生长和聚结的整个过程。气泡成核压力，数量密度，生长规律和聚结特性被估算为熔体水含量，减压速率和温度的函数。计算了气泡成核和聚结过程中的熔体/蒸气表面张力。我们的数据显示与以前在经典船只中获得的数据吻合良好。提出了方法上的改进，用于火山岩管道中岩浆脱气的实验模拟。

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