Rapid FTIR sensing of volcanic gases released by Strombolian explosions at Yasur volcano, Vanuatu
Rapid FTIR sensing of volcanic gases released by Strombolian explosions at Yasur volcano, Vanuatu
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对瓦努阿图亚苏尔火山 Strombolian 爆炸释放的火山气体进行快速 FTIR 传感
DOI：
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发表时间：
2006
期刊：
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通讯作者：
G. Sawyer
中科院分区：
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作者：
C. Oppenheimer;P. Bani;J. Calkins;M. Burton;G. Sawyer
我们在这里报告的结果，一个便携式傅里叶变换红外（FTIR）光谱仪被用来测量从亚苏尔火山，瓦努阿图，在2005年1月的气体排放量的实地活动。通过以高速率（约1 Hz）收集FTIR光谱，我们能够观察到Strombolian喷发（SO2/HCl摩尔比高达1.30或更高）期间释放的排放物中SO2和HCl的比例与从岩浆喷口（SO2/HCl = 1.22）排放的被动排放物相比存在显着差异。这种对比可以解释为源气体在不同的深度相对于水平，SO2和HCl exsolve从熔体：更深的挥发性exsolution供应相对SO2丰富的气体负责在管道的顶部短暂的爆炸，而脱气浅岩浆，贫硫，但富含氯，有助于被动排放。
We report here the results of a field campaign in which a portable Fourier transform infrared (FTIR) spectrometer was used to measure gas emissions from Yasur volcano, Vanuatu, in January 2005. By collecting FTIR spectra at a high rate (about 1 Hz), we were able to observe a marked difference in the proportions of SO2 and HCl in emissions released during Strombolian eruptions (SO2/HCl molar ratio up to ∼30 or more) compared with the intervening passive emissions discharged from the magmatic vent (SO2/HCl ∼2). This contrast can be explained by sourcing gas at different depths with respect to levels at which SO2 and HCl exsolve from the melt: deeper volatile exsolution supplies relatively SO2-rich gas responsible for the ephemeral explosions at the top of the conduit; while degassing of shallow magma, depleted in sulfur but rich in chlorine, contributes to the passive emission.