Sebastian B. Mueller
Ash aggregation enhanced by deposition and redistribution of salt on the surface of volcanic ash in eruption plumes
Mueller, Sebastian B.; Ayris, Paul M.; Wadsworth, Fabian B.; Kueppers, Ulrich; Casas, Ana S.; Delmelle, Pierre; Taddeucci, Jacopo; Jacob, Michael; Dingwell, Donald B.
Authors
Paul M. Ayris
Dr Fabian Wadsworth fabian.b.wadsworth@durham.ac.uk
Associate Professor
Ulrich Kueppers
Ana S. Casas
Pierre Delmelle
Jacopo Taddeucci
Michael Jacob
Donald B. Dingwell
Abstract
Interactions with volcanic gases in eruption plumes produce soluble salt deposits on the surface of volcanic ash. While it has been postulated that saturation-driven precipitation of salts following the dissolution of ash surfaces by condensed acidic liquids is a primary mechanism of salt formation during an eruption, it is only recently that this mechanism has been subjected to detailed study. Here we spray water and HCl droplets into a suspension of salt-doped synthetic glass or volcanic ash particles, and produce aggregates. Deposition of acidic liquid droplets on ash particles promotes dissolution of existing salts and leaches cations from the underlying material surface. The flow of liquid, due to capillary forces, will be directed to particle-particle contact points where subsequent precipitation of salts will cement the aggregate. Our data suggest that volcanically-relevant loads of surface salts can be produced by acid condensation in eruptive settings. Several minor and trace elements mobilised by surface dissolution are biologically relevant; geographic areas with aggregation-mediated ash fallout could be “hotspots” for the post-deposition release of these elements. The role of liquids in re-distributing surface salts and cementing ash aggregates also offers further insight into the mechanisms which preserve well-structured aggregates in some ash deposits.
Citation
Mueller, S. B., Ayris, P. M., Wadsworth, F. B., Kueppers, U., Casas, A. S., Delmelle, P., …Dingwell, D. B. (2017). Ash aggregation enhanced by deposition and redistribution of salt on the surface of volcanic ash in eruption plumes. Scientific Reports, 7, Article 45762. https://doi.org/10.1038/srep45762
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 2, 2017 |
Online Publication Date | Mar 31, 2017 |
Publication Date | Mar 31, 2017 |
Deposit Date | Mar 20, 2018 |
Publicly Available Date | Apr 18, 2018 |
Journal | Scientific Reports |
Publisher | Nature Research |
Peer Reviewed | Peer Reviewed |
Volume | 7 |
Article Number | 45762 |
DOI | https://doi.org/10.1038/srep45762 |
Public URL | https://durham-repository.worktribe.com/output/1332296 |
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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
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