The interaction between volcanic gases and tephra; fluorine adhering to tephra of the 1970 Hekla eruption

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Authors:Oskarsson, Niels
Volume Title:Journal of Volcanology and Geothermal Research
Source:Journal of Volcanology and Geothermal Research, 8(2-4), p.251-266. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-0273
Publication Date:1980
Note:In English. 14 refs.; illus. incl. tables, sketch map
Summary:The mass distribution and sorting of tephra produced in the plinian phase of the 1970 Hekla eruption was controlled by the particle-size distribution, the height of the eruption column and velocity of transport. Near the volcano the mass distribution of soluble F was controlled by particle size of the deposits, but approaches the mass distribution of the tephra at longer distances. Adsorbed soluble F reaches a maximum at a distance from the volcano determined by the velocity of the transporting medium. SEM studies show the soluble F to be chemically adsorbed on the surface of tephra particles. The adsorption is shown by experiment to occur at T < 600°C in the cooling eruption column. Evaluation of reactions in the eruption column leads to the conclusion that formation of water-soluble compounds adhering to tephra is principally controlled by environmental factors and to a lesser degree by the composition of the volcanic gas phase. (Author's abstract) [T.R.]
Subjects:Adsorption; Eruptions; Fluorine; Gases; Geochemistry; Grain size; Halogens; Igneous rocks; Processes; Pyroclastics; SEM data; Volcanic rocks; Volcanoes; Volcanology; Europe; Hekla; Iceland; Western Europe
Coordinates:N633000 N650000 W0180000 W0200000
Abstract Numbers:83M/5218
Record ID:1981026667
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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