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- W4285386616 abstract "Multi-disciplinary volcanic gas observations, including FTIR, Multi-GAS, and Alkali filter pack, were made at Masaya Volcano, Nicaragua, in January 2018. During the observation period, a lava lake was present, and the majority of the volcanic gases were likely emitted directly from the lava without any hydrothermal alterations. It is expected that the volcanic gas composition reflects the conditions of the magma, exhibiting a high equilibrium temperature. The fractions of the major components showed good consistency with previous studies; however, we found the fraction of the combustible components (such as H 2 ) were lower than expected. The R H [log(H 2 /H 2 O)] value was measured to be less than −6, compared to the equilibrium R H value calculated to be around −3 from the iron speciation. The equilibrium calculations suggest oxidation of the volcanic gases by high-temperature mixing with the air once they are emitted from the lava lake, lowering the H 2 content of the plume. In contrast to H 2 , a small amount of CO, another combustible species, was detected and the derived CO 2 /CO ratio of ca. 1,000 is consistent with the equilibrium magmatic value. This indicates that CO is kinetically inert compared to H 2 . Our findings suggest that volcanic gases in the Masaya plume do not preserve information from when the gases were originally in equilibrium with the high-temperature surrounding magma." @default.
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- W4285386616 date "2022-07-14" @default.
- W4285386616 modified "2023-10-11" @default.
- W4285386616 title "Behaviors of Redox-Sensitive Components in the Volcanic Plume at Masaya Volcano, Nicaragua: H2 Oxidation and CO Preservation in Air" @default.
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- W4285386616 doi "https://doi.org/10.3389/feart.2022.867562" @default.
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