Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Ash aggregation enhanced by deposition and redistribution of salt on the surface of volcanic ash in eruption plumes.

Mueller, Sebastian B. and Ayris, Paul M. and Wadsworth, Fabian B. and Kueppers, Ulrich and Casas, Ana S. and Delmelle, Pierre and Taddeucci, Jacopo and Jacob, Michael and Dingwell, Donald B. (2017) 'Ash aggregation enhanced by deposition and redistribution of salt on the surface of volcanic ash in eruption plumes.', Scientific reports., 7 . p. 45762.

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.

Item Type:Article
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
Download PDF
(1019Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1038/srep45762
Publisher statement: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/
Date accepted:02 March 2017
Date deposited:18 April 2018
Date of first online publication:31 March 2017
Date first made open access:18 April 2018

Save or Share this output

Export:
Export
Look up in GoogleScholar