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首页> 外文期刊>Journal of Volcanology and Geothermal Research >A post-eruption study of gases and thermal waters at Okmok volcano, Alaska
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A post-eruption study of gases and thermal waters at Okmok volcano, Alaska

机译：阿拉斯加州Okmok Volcano的气体和热水后爆发研究

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We report here on the first focused study of gas discharges and thermal spring waters at Okmok volcano since the 2008 phreatomagmatic eruptions. Results include the first compositional gas data from Okmok with minimal air contamination and the first data on magmatic carbon in Okmok spring waters. Chemical and isotopic analyses of the waters and gases are used to assess the character of Okmok fluids eight years after the eruptions ceased.Gases from vents on intracaldera Cone C have high concentrations of H-2 and contain H2S rather than SO2, demonstrating the influence of a hydrothermal system, while isotope values of carbon (-10.2 to -8.9 parts per thousand and helium (similar to 8 R-A) confirm the presence of magma-derived volatiles. Estimates of equilibrium temperatures for the Cone C gas are similar to 230 +/- 30 degrees C. A much cooler reservoir with a maximum temperature of -55 degrees C feeds the intracaldera warm springs. Based on discharge measurements of creeks draining the caldera, the total heat output of the warm springs is estimated to be about 32 MW.Gas data from a single location of steaming ground at the Geyser Bight geothermal area southwest of the Okmok Caldera are given. The gas is typical of geothermal gases with high concentrations of H2S and an air-corrected helium isotope ratio of 7.15 R-A. Published by Elsevier B.V.
机译：自2008年的Phreatomagic爆发以来，我们在此报告了Okmok火山的第一个重点研究了Okmok火山的热弹簧水。结果包括来自Okmok的第一种组成气体数据，气体污染的最小空气污染以及Okmok Spring Waters中的岩浆碳的第一数据。水和气体的化学和同位素分析用于评估爆发后八年的Okmok液体的特征。从肝癌锥C癌的通风口中的抑制浓度的H 2 S而不是SO2，展示了影响水热系统，而碳的同位素值（-10.2至-8.9份，氦气（类似于8 ra）证实了岩浆衍生挥发物的存在。锥形气体的平衡温度估计类似于230 + / - 30摄氏度，最高温度为-55摄氏度的冷却器储存器饲喂intracaldera温泉。基于排出火山的小溪的放电测量，温泉的总热输出估计为约32兆瓦。给出了来自Okmok Caldera西南地热地热区域的蒸涌地区的单个位置的气体数据。气体是具有高浓度H2的地热气体和空气正确的典型ED氦同位素比例为7.15 r-a。由elsevier b.v出版。

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