Decompression experiments identify kinetic controls on explosive silicic eruptions
Decompression experiments identify kinetic controls on explosive silicic eruptions
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DOI：
10.1029/2004gl019509
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发表时间：
2004-04
影响因子：
5.2
通讯作者：
M. Mangan;T. Sisson;W. B. Hankins
中科院分区：
文献类型：
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作者：
M. Mangan;T. Sisson;W. B. Hankins
喷发强度在很大程度上受减压引起的溶解在岩浆中的富水气体的释放控制。决定岩浆在喷发过程中向上推进的力量的不仅仅是气体的数量，还有脱气的速率，脱气的速率部分地是触发气泡成核的过饱和压力（Δ P临界）的函数。使用流纹岩和英安岩熔体的高温和高压减压实验揭示了脱气的Δ P临界的成分依赖性差异，这可能解释了为什么流纹岩助长了一些有记录以来最具爆炸性的喷发。
Eruption intensity is largely controlled by decompression‐induced release of water‐rich gas dissolved in magma. It is not simply the amount of gas that dictates how forcefully magma is propelled upwards during an eruption, but also the rate of degassing, which is partly a function of the supersaturation pressure (ΔPcritical) triggering gas bubble nucleation. High temperature and pressure decompression experiments using rhyolite and dacite melt reveal compositionally‐dependent differences in the ΔPcritical of degassing that may explain why rhyolites have fueled some of the most explosive eruptions on record.