We provide evidence that noble gasses (NGs) trapped in Pele's hairs and tears can be used as a tool to monitor the degassing behaviour of persistently active volcanic systems. We investigated ⁴He, ³⁶Ar, ⁴⁰Ar abundances and ⁴He/⁴⁰Ar* and ⁴⁰Ar/³⁶Ar isotopic ratios in samples collected in March 2015 and March 2016 from Masaya volcano (Nicaragua). The resurgence of a lava lake in December 2015 provided the opportunity to monitor NG variations during a specific volcanic event. The variations in the NG abundances of individual glass particles are here attributed to solubility-controlled NG fractionation between melt and bubbles, and consequently correlated with sample vesicularity and vesicle size. Inhomogeneous incorporation of ³⁶Ar, along with kinetic mass fractionation during magma degassing, vesiculation and fast-quenching of the samples after eruption, are the mechanisms that control the variability of the ⁴⁰Ar/³⁶Ar ratios observed in the samples. From March 2015 to March 2016, our data indicate a general increase of mean ⁴⁰Ar* abundances from 1.9E⁻⁸ ± 1.4E⁻⁸ cc/g to 9.3E⁻⁸ ± 8.9E⁻⁸ cc/g and decrease in mean ⁴He/⁴⁰Ar* ratios from 0.37 ± 0.15 to 0.18 ± 0.13. We ascribe this to the upward migration of a gas-rich magma from depth that recharged the shallow magmatic reservoir of Masaya at some point between the two collection periods. Since this model agrees well with the physical volcanology of Masaya and with gas plume measurements spanning our collection period, we suggest that NG in Pele's hairs and tears can be further used as a valuable tool to monitor degassing processes at Masaya volcano and, when samples are available, at other persistently degassing systems (e.g. Etna, Hawaii).

我们提供的证据表明，困在贝利的头发和眼泪中的稀有气体（NGs）可用作监测持续活动的火山系统脱气行为的工具。我们研究了⁴ He，³⁶ Ar，⁴⁰ Ar丰度和⁴ He / ⁴⁰ Ar *和⁴⁰ Ar / ³⁶2015年3月和2016年3月从马萨亚火山（尼加拉瓜）采集的样品中的Ar同位素比。2015年12月，熔岩湖的复兴为特定火山事件期间监测天然气变化提供了机会。单个玻璃颗粒的NG丰度的变化在此归因于熔体和气泡之间的溶解度控制的NG分离，因此与样品的囊泡性和囊泡大小相关。³⁶ Ar的不均匀掺入以及喷发后样品的岩浆脱气，囊泡化和快速淬灭过程中的动力学质量分馏是控制⁴⁰ Ar / ³⁶变异性的机制样品中观察到的Ar比。从2015年3月到2016年3月，我们的数据表明平均⁴⁰ Ar *丰度从1.9E ^-8 ±1.4E ^-8 cc / g普遍增加到9.3E ^-8 ±8.9E ^-8 cc / g，平均降低⁴他/ ⁴⁰Ar *比率从0.37±0.15到0.18±0.13。我们将其归因于富含天然气的岩浆从深处向上迁移，这在两个收集期之间的某个时间点为马萨亚浅岩浆储层补充了能量。由于此模型与Masaya的物理火山学以及整个采集期的气羽测量非常吻合，因此我们建议将Pele的头发和眼泪中的NG进一步用作监测Masaya火山脱气过程的有价值的工具，以及在采样时可在其他持续除气系统（例如，埃特纳火山，夏威夷）上使用。