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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Intensive gas sampling of noble gases and carbon at Vulcano Island (southern Italy)
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Intensive gas sampling of noble gases and carbon at Vulcano Island (southern Italy)

机译：武尔卡诺岛（意大利南部）的稀有气体和碳的密集气体采样

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The helium isotopic ratio of crater, beach and submarine fumaroles, water wells, and soil gases at Vulcano Island has been, since 1987, repeatedly measured. The ~3He/~4He from crater fumaroles (F5 and FA) oscillates biennially between 4.9 and 6.0-6.2 R/R_a. The periodicity of the ~3He/~4He oscillation may be linked to pressure variations in a deep gas reservoir. Chemical and carbon isotope variations during the same period closely reflect rends shown by helium. These simultaneous variations, chemical and isotopic, suggest a close relationship between these species and reflect one dominant process, which belong to the routine activity of the volcano. The ~(40)Ar/~(36)Ar ratio up to 1200 is not consistent with the presence of an air-rich source and suggests the addition of radiogenic argon. Neon data (~(20)Ne/~(22)Ne and (~21)Ne/~(22)Ne) indicates that a crustal component is present beneath the volcano. Heavy carbon, 0 per thousand approx -2 per thousand, also supports the existence of a crustal component. The isotopic data here obtained do not indicate that the recorded variations (chemical and isotopic) indicate a "period of unrest" at Vulcano Island. The present phase of activity is explained with a two-state model of the feeding sources of the volcano: (a) a gas release from intermediate and surficial sources and (b) a magmatic pulse, ~3He-rich, from a deep gas reservoir (not migration of magma) which continuously mixes with more surficial fluids. Additions of surficial (air saturated waters) or atmospheric fluids are minor and may occur during the ascent of the gas phase to the surface or, more likely, be added at the time of the gas collection.
机译：自1987年以来，对Vulcano岛的火山口，海滩和海底喷气孔，水井和土壤气体中的氦同位素比率进行了反复测量。火山口喷气孔（F5和FA）的〜3He /〜4He每两年在4.9和6.0-6.2 R / R_a之间振荡。 〜3He /〜4He振荡的周期性可能与深层气藏中的压力变化有关。同一时期的化学和碳同位素变化紧密反映了氦气所显示的裂隙。这些同时发生的变化（化学和同位素）表明这些物种之间存在密切关系，并反映了一个主要过程，该过程属于火山的常规活动。高达（1200）的〜（40）Ar /〜（36）Ar与富含空气的气源的存在不一致，这表明添加了放射性氩。霓虹数据（〜（20）Ne /〜（22）Ne和（〜21）Ne /〜（22）Ne）表明火山下面存在地壳成分。重碳（千分之0到千分之二）也支持地壳成分的存在。此处获得的同位素数据并不表示记录的变化（化学和同位素）表明了Vulcano岛的“动荡时期”。目前的活动阶段是用火山的补给源的两种状态模型来解释的：（a）来自中间和地表源的气体释放，以及（b）来自深层气藏的岩浆脉冲（〜3He富集） （不是岩浆的迁移）与更多的地表流体不断混合。少量的表面（空气饱和水）或大气流体的添加可能会在气相上升至表面时发生，或者更有可能在收集气体时添加。

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