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Oxygen fugacity stratification of a magma chamber revealed by Mössbauer spectroscopy: evidence from the 1875 Askja eruption, N. Iceland

  • Mineralogy, Geology and Archaeology
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Abstract

Mössbauer spectra of volcanic glasses from the 1875 Askja eruption reveals that the dacitemagma chamber was stratified in oxygen fugacity. The eruption was triggered by basaltic magma which was intruded into the base of the chamber. The observed oxidation state falls within the range of oxygen fugacities of H2O/CO2 mixtures at the liquidus temperature of the magma. It is concluded that oxygen fugacity of the chamber was effected by volcanic gases. The source of the gases was the degassing of superheated dacite at the dacite/basalt interface along the bottom of the chamber.

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Authors and Affiliations

  1. Science Institute, University of Iceland, Dunhaga 3, IS-107, Reykjavík, Iceland

    Ö Helgason

  2. Nordic Volcanological Institute, University of Iceland, Iceland

    N. Oskarsson & G. E. Sigvaldason

Authors
  1. Ö Helgason
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  2. N. Oskarsson
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  3. G. E. Sigvaldason
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Helgason, Ö., Oskarsson, N. & Sigvaldason, G.E. Oxygen fugacity stratification of a magma chamber revealed by Mössbauer spectroscopy: evidence from the 1875 Askja eruption, N. Iceland. Hyperfine Interact 70, 989–992 (1992). https://doi.org/10.1007/BF02397494

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  • DOI: https://doi.org/10.1007/BF02397494

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