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Brecciation at the grain scale within the lithologies of the Winchcombe Mighei‐like carbonaceous chondrite (2024)
Journal Article
Daly, L., Suttle, M. D., Lee, M. R., Bridges, J., Hicks, L., Martin, P. M. C., …Black, K. (2024). Brecciation at the grain scale within the lithologies of the Winchcombe Mighei‐like carbonaceous chondrite. Meteoritics & Planetary Science, https://doi.org/10.1111/maps.14164

The Mighei‐like carbonaceous (CM) chondrites have been altered to various extents by water–rock reactions on their parent asteroid(s). This aqueous processing has destroyed much of the primary mineralogy of these meteorites, and the degree of alterat... Read More about Brecciation at the grain scale within the lithologies of the Winchcombe Mighei‐like carbonaceous chondrite.

The rheological response of magma to nanolitisation (2024)
Journal Article
Pereira, L., Linard, Y., Wadsworth, F. B., Vasseur, J., Hess, K., Moretti, R., …Neuville, D. R. (2024). The rheological response of magma to nanolitisation. Journal of Volcanology and Geothermal Research, 448, Article 108039. https://doi.org/10.1016/j.jvolgeores.2024.108039

Viscosity exerts a fundamental control on magmatic kinetics and dynamics, controlling magma ascent, eruptive style, and the emplacement of lava. Nanolites – crystals smaller than a micron – are thought to affect magma viscosity, but the underlying me... Read More about The rheological response of magma to nanolitisation.

Estimating π Using the Topography of the Terrestrial Planets (2024)
Journal Article
Vasseur, J., & Wadsworth, F. B. (2024). Estimating π Using the Topography of the Terrestrial Planets. Journal of Geophysical Research: Planets, 129(3), Article e2024JE008378. https://doi.org/10.1029/2024je008378

It is π‐day 2024 (March 14th) and to celebrate, we ask the question: can π be estimated accurately using the shape of the terrestrial planets and the Moon? We proceed by using models for the planet topographies in slices of constant latitude and comp... Read More about Estimating π Using the Topography of the Terrestrial Planets.

Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation (2023)
Journal Article
Pereira, L., Schuller, S., Wadsworth, F. B., Vasseur, J., Lancelotti, R. F., Hess, K., …Dingwell, D. B. (2023). Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation. International Journal of Applied Glass Science, https://doi.org/10.1111/ijag.16650

During glass production, phase separation can result in the formation of suspended liquid droplets, which can cause changes in the system rheology. In nuclear waste vitrification context, some new glassy matrices may present this phase separation mat... Read More about Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation.

Microstructural Controls on the Uniaxial Compressive Strength of Porous Rocks Through the Granular to Non‐Granular Transition (2023)
Journal Article
Carbillet, L., Wadsworth, F. B., Heap, M. J., & Baud, P. (2023). Microstructural Controls on the Uniaxial Compressive Strength of Porous Rocks Through the Granular to Non‐Granular Transition. Geophysical Research Letters, 50(21), Article e2023GL104678. https://doi.org/10.1029/2023gl104678

Under uniaxial compression, a porous rock fails by coalescence of stress‐induced microcracks. The micromechanical models developed to analyze uniaxial compressive strength data consider a single mechanism for the initiation and propagation of microcr... Read More about Microstructural Controls on the Uniaxial Compressive Strength of Porous Rocks Through the Granular to Non‐Granular Transition.

Sintering of vesiculating pyroclasts (2023)
Journal Article
Weaver, J., Lamur, A., Lea, T., Wadsworth, F., Kendrick, J., Schauroth, J., & Lavallée, Y. (2023). Sintering of vesiculating pyroclasts. Earth and Planetary Science Letters, 623, Article 118410. https://doi.org/10.1016/j.epsl.2023.118410

Hot volcanic pyroclasts can sinter, vesiculate, and outgas in concert – a combination of processes which remains poorly constrained. And yet this combination of processes can occur coincidently during deposition from pyroclastic density currents, in... Read More about Sintering of vesiculating pyroclasts.

Alternating Subplinian and phreatomagmatic phases during the construction of a phonolitic maar-diatreme volcano (Caldera del Rey, Tenerife, Canary Islands) (2023)
Journal Article
Bowers, O., Dávila Harris, P., Winstanley, R., Wadsworth, F. B., & Brown, R. J. (2023). Alternating Subplinian and phreatomagmatic phases during the construction of a phonolitic maar-diatreme volcano (Caldera del Rey, Tenerife, Canary Islands). Journal of Volcanology and Geothermal Research, 443, 107920. https://doi.org/10.1016/j.jvolgeores.2023.107920

The Early Pleistocene, well exposed, Caldera del Rey maar-diatreme volcano, Tenerife, Canary Islands was constructed during a ∼ VEI 4 phonolitic eruption that involved two cycles of magmatic-to-phreatomagmatic activity and resulted in two overlapping... Read More about Alternating Subplinian and phreatomagmatic phases during the construction of a phonolitic maar-diatreme volcano (Caldera del Rey, Tenerife, Canary Islands).

A Scaling for the Permeability of Loose Magma Mush Validated Using X‐Ray Computed Tomography of Packed Confectionary in 3D and Estimation Methods From 2D Crystal Shapes (2023)
Journal Article
Bretagne, E., Wadsworth, F. B., Vasseur, J., & Dobson, K. J. (2023). A Scaling for the Permeability of Loose Magma Mush Validated Using X‐Ray Computed Tomography of Packed Confectionary in 3D and Estimation Methods From 2D Crystal Shapes. Journal of Geophysical Research: Solid Earth, 128(10), Article e2023JB026795. https://doi.org/10.1029/2023jb026795

Melt percolation through partially molten “mushy” regions of the crust underpins models for magma migration, accumulation, and processes that prime systems for eruption. Knowledge of the hydraulic properties of magma mush, specifically permeability,... Read More about A Scaling for the Permeability of Loose Magma Mush Validated Using X‐Ray Computed Tomography of Packed Confectionary in 3D and Estimation Methods From 2D Crystal Shapes.

Obsidian clasts as sintered remnants of agglutination processes in volcanic conduits, evidence from the Pepom tephras (Sete Cidades), São Miguel, Azores (2023)
Journal Article
Ellis, B., Pimentel, A., Cortes-Calderon, E., Moser, Z., Baumann, N., Bachmann, O., & Wadsworth, F. (2023). Obsidian clasts as sintered remnants of agglutination processes in volcanic conduits, evidence from the Pepom tephras (Sete Cidades), São Miguel, Azores. Chemical Geology, 638, Article 121694. https://doi.org/10.1016/j.chemgeo.2023.121694

The youngest explosive eruptions of the Sete Cidades volcano, São Miguel, Azores, are recorded by a series of relatively small-volume (

Melt diffusion-moderated crystal growth and its effect on euhedral crystal shapes (2023)
Journal Article
Mangler, M. F., Humphreys, M. C. S., Geifman, E., Iveson, A. A., Wadsworth, F. B., Brooker, R. A., …Hammond, K. (2023). Melt diffusion-moderated crystal growth and its effect on euhedral crystal shapes. Journal of Petrology, 64(8), https://doi.org/10.1093/petrology/egad054

Crystal growth is often described as either interface-controlled or diffusion-controlled. Here, we study crystal growth in an intermediate scenario where reaction rates at the crystal-melt interface are similar to the rates of diffusive transport of... Read More about Melt diffusion-moderated crystal growth and its effect on euhedral crystal shapes.

The permeability of loose magma mush (2023)
Journal Article
Bretagne, E., Wadsworth, F. B., Vasseur, J., Humphreys, M. C., Dingwell, D. B., Dobson, K. J., …Rooyakkers, S. M. (2023). The permeability of loose magma mush. Geology, 51(9), 829-832. https://doi.org/10.1130/g51133.1

Models for the evolution of magma mush zones are of fundamental importance for understanding magma storage, differentiation in the crust, and melt extraction processes that prime eruptions. These models require calculations of the permeability of the... Read More about The permeability of loose magma mush.

The physics of dancing peanuts in beer (2023)
Journal Article
Pereira, L., Wadsworth, F. B., Vasseur, J., Schmid, M., Thivet, S., Nuernberg, R. B., & Dingwell, D. B. (2023). The physics of dancing peanuts in beer. Royal Society Open Science, 10(6), https://doi.org/10.1098/rsos.230376

In Argentina, some people add peanuts to their beer. Once immersed, the peanuts initially sink part way down into the beer before bubbles nucleate and grow on the peanut surfaces and remain attached. The peanuts move up and down within the beer glass... Read More about The physics of dancing peanuts in beer.

Bubble Formation in Magma (2023)
Journal Article
Gardner, J. E., Wadsworth, F. B., Carley, T. L., Llewellin, E. W., Kusumaatmaja, H., & Sahagian, D. (2023). Bubble Formation in Magma. Annual Review of Earth and Planetary Sciences, 51(1), 131-154. https://doi.org/10.1146/annurev-earth-031621-080308

Volcanic eruptions are driven by bubbles that form when volatile species exsolve from magma. The conditions under which bubbles form depend mainly on magma composition, volatile concentration, presence of crystals, and magma decompression rate. These... Read More about Bubble Formation in Magma.

The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption (2023)
Journal Article
Unwin, H. E., Tuffen, H., Wadsworth, F. B., Phillips, E. R., James, M. R., Foster, A., …Porritt, L. A. (2023). The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption. Bulletin of Volcanology, 85(5), Article 28. https://doi.org/10.1007/s00445-023-01638-z

Silicic volcanic eruptions commonly begin with the explosive ejection of pyroclastic material, before transitioning to gentler effusion-dominated activity. Well-exposed dissected silicic systems are scarce and poorly studied, hindering the advances i... Read More about The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption.

Dehydration‐driven mass loss from packs of sintering hydrous silicate glass particles (2023)
Journal Article
Vasseur, J., Wadsworth, F. B., Lavallée, Y., & Dingwell, D. B. (2023). Dehydration‐driven mass loss from packs of sintering hydrous silicate glass particles. Journal of the American Ceramic Society, 106(8), 4643-4653. https://doi.org/10.1111/jace.19120

Glass sintering involves the densification of packs of particles and the expulsion of the interparticle pore gas. The pore space begins as a convolute interconnected interparticle network, and ends as distributed isolated bubbles; two configurations... Read More about Dehydration‐driven mass loss from packs of sintering hydrous silicate glass particles.

A universal model for the permeability of sintered materials (2023)
Journal Article
Wadsworth, F. B., Vasseur, J., Heap, M. J., Carbillet, L., Dingwell, D. B., Reuschlé, T., & Baud, P. (2023). A universal model for the permeability of sintered materials. Acta Materialia, 250, https://doi.org/10.1016/j.actamat.2023.118859

Sintered materials are used as permeable filters and flow controllers, for which a validated and general model of porosity and permeability is required. Here, we prepare samples built from mono- and polydisperse glass bead populations sintered for kn... Read More about A universal model for the permeability of sintered materials.

The performance of differential point positioning using low-cost GNSS in comparison to DInSAR for monitoring coseismic displacement of the Provenzana–Pernicana fault system (Mt. Etna, 2018 December eruptive phase) (2023)
Journal Article
Wilkinson, M. W., Bonforte, A., Jones, R. R., Wadsworth, F. B., Roberts, G. P., & Guglielmino, F. (2023). The performance of differential point positioning using low-cost GNSS in comparison to DInSAR for monitoring coseismic displacement of the Provenzana–Pernicana fault system (Mt. Etna, 2018 December eruptive phase). Geophysical Journal International, 234(2), 1012-1023. https://doi.org/10.1093/gji/ggad118

Mt. Etna is a perfect laboratory for testing new approaches and new technologies in a very active geodynamic environment. It offers, in fact, the opportunity for measuring active crustal deformation, related to volcanic activity as well as to seismic... Read More about The performance of differential point positioning using low-cost GNSS in comparison to DInSAR for monitoring coseismic displacement of the Provenzana–Pernicana fault system (Mt. Etna, 2018 December eruptive phase).

Shear thinning and brittle failure in crystal-bearing magmas arise from local non-Newtonian effects in the melt (2023)
Journal Article
Vasseur, J., Wadsworth, F. B., & Dingwell, D. B. (2023). Shear thinning and brittle failure in crystal-bearing magmas arise from local non-Newtonian effects in the melt. Earth and Planetary Science Letters, 603, Article 117988. https://doi.org/10.1016/j.epsl.2023.117988

Crystal-bearing magmas are often assumed to be intrinsically non-Newtonian, but the mechanism underlying suspension shear thinning remains unconstrained. Here, we test the hypothesis that shear thinning in these suspensions arises solely from unrelax... Read More about Shear thinning and brittle failure in crystal-bearing magmas arise from local non-Newtonian effects in the melt.