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Hornby AJ, Ayris PM, Damby DE, Diplas S, Eychenne J, Kendrick JE, Cimarelli C, Kueppers U, Scheu B, Utley JEP, Dingwell DB. Nanoscale silicate melt textures determine volcanic ash surface chemistry. Nat Commun 2024; 15:531. [PMID: 38225238 PMCID: PMC10789741 DOI: 10.1038/s41467-024-44712-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 01/02/2024] [Indexed: 01/17/2024] Open
Abstract
Explosive volcanic eruptions produce vast quantities of silicate ash, whose surfaces are subsequently altered during atmospheric transit. These altered surfaces mediate environmental interactions, including atmospheric ice nucleation, and toxic effects in biota. A lack of knowledge of the initial, pre-altered ash surface has required previous studies to assume that the ash surface composition created during magmatic fragmentation is equivalent to the bulk particle assemblage. Here we examine ash particles generated by controlled fragmentation of andesite and find that fragmentation generates ash particles with substantial differences in surface chemistry. We attribute this disparity to observations of nanoscale melt heterogeneities, in which Fe-rich nanophases in the magmatic melt deflect and blunt fractures, thereby focusing fracture propagation within aureoles of single-phase melt formed during diffusion-limited growth of crystals. In this manner, we argue that commonly observed pre-eruptive microtextures caused by disequilibrium crystallisation and/or melt unmixing can modify fracture propagation and generate primary discrepancies in ash surface chemistry, an essential consideration for understanding the cascading consequences of reactive ash surfaces in various environments.
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Affiliation(s)
- Adrian J Hornby
- Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA.
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany.
| | - Paul M Ayris
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany
| | - David E Damby
- U.S. Geological Survey, Volcano Science Center, Menlo Park, CA, USA
| | | | - Julia Eychenne
- Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, F-63000, Clermont-Ferrand, France
- Université Clermont Auvergne, CNRS, INSERM, Institut de Génétique Reproduction et Développement, F-63000, Clermont-Ferrand, France
| | - Jackie E Kendrick
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany
| | - Corrado Cimarelli
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany
| | - Ulrich Kueppers
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany
| | - Bettina Scheu
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany
| | - James E P Utley
- Department of Earth, Ocean & Ecological Sciences, University of Liverpool, Liverpool, UK
| | - Donald B Dingwell
- Department of Earth and Environmental Science, Ludwig-Maximilians-Universtität (LMU), München, Germany
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Tomašek I, Damby DE, Horwell CJ, Ayris PM, Delmelle P, Ottley CJ, Cubillas P, Casas AS, Bisig C, Petri-Fink A, Dingwell DB, Clift MJD, Drasler B, Rothen-Rutishauser B. Assessment of the potential for in-plume sulphur dioxide gas-ash interactions to influence the respiratory toxicity of volcanic ash. Environ Res 2019; 179:108798. [PMID: 31629947 DOI: 10.1016/j.envres.2019.108798] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 09/09/2019] [Accepted: 10/04/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Volcanic plumes are complex environments composed of gases and ash particles, where chemical and physical processes occur at different temperature and compositional regimes. Commonly, soluble sulphate- and chloride-bearing salts are formed on ash as gases interact with ash surfaces. Exposure to respirable volcanic ash following an eruption is potentially a significant health concern. The impact of such gas-ash interactions on ash toxicity is wholly un-investigated. Here, we study, for the first time, whether the interaction of volcanic particles with sulphur dioxide (SO2) gas, and the resulting presence of sulphate salt deposits on particle surfaces, influences toxicity to the respiratory system, using an advanced in vitro approach. METHODS To emplace surface sulphate salts on particles, via replication of the physicochemical reactions that occur between pristine ash surfaces and volcanic gas, analogue substrates (powdered synthetic volcanic glass and natural pumice) were exposed to SO2 at 500 °C, in a novel Advanced Gas-Ash Reactor, resulting in salt-laden particles. The solubility of surface salt deposits was then assessed by leaching in water and geochemical modelling. A human multicellular lung model was exposed to aerosolised salt-laden and pristine (salt-free) particles, and incubated for 24 h. Cell cultures were subsequently assessed for biological endpoints, including cytotoxicity (lactate dehydrogenase release), oxidative stress (oxidative stress-related gene expression; heme oxygenase 1 and NAD(P)H dehydrogenase [quinone] 1) and its (pro-)inflammatory response (tumour necrosis factor α, interleukin 8 and interleukin 1β at gene and protein levels). RESULTS In the lung cell model no significant effects were observed between the pristine and SO2-exposed particles, indicating that the surface salt deposits, and the underlying alterations to the substrate, do not cause acute adverse effects in vitro. Based on the leachate data, the majority of the sulphate salts from the ash surfaces are likely to dissolve in the lungs prior to cellular uptake. CONCLUSIONS The findings of this study indicate that interaction of volcanic ash with SO2 during ash generation and transport does not significantly affect the respiratory toxicity of volcanic ash in vitro. Therefore, sulphate salts are unlikely a dominant factor controlling variability in in vitro toxicity assessments observed during previous eruption response efforts.
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Affiliation(s)
- Ines Tomašek
- Institute of Hazard, Risk and Resilience, Department of Earth Sciences, Durham University, Science Labs, Durham, DH1 3LE, United Kingdom; BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland.
| | - David E Damby
- Volcano Science Center, United States Geological Survey, Menlo Park, California, 94025, United States
| | - Claire J Horwell
- Institute of Hazard, Risk and Resilience, Department of Earth Sciences, Durham University, Science Labs, Durham, DH1 3LE, United Kingdom
| | - Paul M Ayris
- Department of Earth and Environmental Sciences, Section for Mineralogy, Petrology and Geochemistry, Ludwig-Maximilians-Universität München, Theresienstrasse 41, D-80333, Munich, Germany
| | - Pierre Delmelle
- Earth & Life Institute, Université catholique de Louvain, Croix Du Sud 2, 1348, Louvain-la-Neuve, Belgium
| | - Christopher J Ottley
- Department of Earth Sciences, Durham University, Science Labs, Durham, DH1 3LE, United Kingdom
| | - Pablo Cubillas
- Department of Earth Sciences, Durham University, Science Labs, Durham, DH1 3LE, United Kingdom
| | - Ana S Casas
- Department of Earth and Environmental Sciences, Section for Mineralogy, Petrology and Geochemistry, Ludwig-Maximilians-Universität München, Theresienstrasse 41, D-80333, Munich, Germany
| | - Christoph Bisig
- BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland
| | - Alke Petri-Fink
- BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland; Chemistry Department, University of Fribourg, Chemin des Musee, CH-1700, Fribourg, Switzerland
| | - Donald B Dingwell
- Department of Earth and Environmental Sciences, Section for Mineralogy, Petrology and Geochemistry, Ludwig-Maximilians-Universität München, Theresienstrasse 41, D-80333, Munich, Germany
| | - Martin J D Clift
- In Vitro Toxicology Group, Swansea University Medical School, Singleton Park Campus, Swansea, SA2 8PP, United Kingdom
| | - Barbara Drasler
- BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland
| | - Barbara Rothen-Rutishauser
- BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland
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