The composition of the magmatic gas of Kilauea and its behavior in the near surface environment

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ID: 295047
1971
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Abstract
Kilauea gas collections are used to calculate the composition of the magmatic gas from which they were derived. Atmospheric gases by four methods results in four atomic compositions; these are used to compute four equilibrium (molecular) compositions for each sample. Simultaneous consideration of atmospheric and water contaminations defines the best method of atmospheric gas removal and shows that all variations in hydrogen content are due to contaminating water. Calculations also indicate that the carbon content of the magmatic gas is not significantly changed; large differences in sulfur are due to changes in SO 2 . When all modifying processes are considered simultaneously, all differences in sample compositions are accounted for. The changes caused by these processes are "reversed" to return each sample to its magmatic composition; all samples yield the same composition. The original analyses are then examined for the degree to which they approach equilibrium. Although none of the analyses is an equilibrium composition, each was at equilibrium at magmatic temperatures. Imperfect quenching and oxidation after collection caused nonequilibrium. Various groups of gases have different reaction rates and exhibit a "spectrum of quenching temperatures." H 2 O contamination and SO 2 changes occurred before cooling; atmospheric contamination occurred after quenching. Volumetric comparisons are made to assess the magnitude of compositional changes and their overall chemical effects.
Reference Key
openalex_W1977638695 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Bert E. Nordlie
Journal american journal of science
Year 1971
DOI
10.2475/ajs.271.5.417
URL
https://doi.org/10.2475/ajs.271.5.417
Keywords Keywords not found

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