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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Origins of geothermal gases at Yellowstone
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Origins of geothermal gases at Yellowstone

机译：黄石地区地热气体的起源

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Gas emissions at the Yellowstone Plateau Volcanic Field (YPVF) reflect open-system mixing of gas species originating from diverse rock types, magmas, and crustal fluids, all combined in varying proportions at different thermal areas. Gases are not necessarily in chemical equilibrium with the waters through which they vent, especially in acid sulfate terrain where bubbles stream through stagnant acid water. Gases in adjacent thermal areas often can be differentiated by isotopic and gas ratios, and cannot be tied to one another solely by shallow processes such as boiling-induced fractionation of a parent liquid. Instead, they inherit unique gas ratios (e.g., CH4/He) from the dominant rock reservoirs where they originate, some of which underlie the Quaternary volcanic rocks. Steam/gas ratios (essentially H2O/CO2) of Yellowstone fumaroles correlate with Ar/He and N-2/CO2, strongly suggesting that H2O/CO2 is controlled by addition of steam boiled from water rich in atmospheric gases. Moreover, H2O/CO2 varies systematically with geographic location, such that boiling is more enhanced in some areas than others.
机译：黄石高原火山场（YPVF）的气体排放反映了来自不同岩石类型，岩浆和地壳流体的各种气体的开放系统混合，这些气体在不同的热区以不同的比例混合。气体不一定与它们排出的水处于化学平衡状态，尤其是在酸性硫酸盐地形中，气泡流过停滞的酸性水。相邻热区中的气体通常可以通过同位素和气体的比例来区分，并且不能仅通过浅层过程（例如母液的沸腾诱导分馏）相互结合。取而代之的是，它们从起源的主要岩石储层中继承了独特的天然气比例（例如CH4 / He），其中一些位于第四纪火山岩之下。黄石喷气孔的蒸汽/气体比率（基本上是H2O / CO2）与Ar / He和N-2 / CO2相关，强烈表明H2O / CO2通过添加从富含大气气体的水中煮沸的蒸汽来控制。此外，H2O / CO2随地理位置而系统地变化，因此某些区域的沸腾比其他区域更大。

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