JpGU-AGU Joint Meeting 2020

Session information

[E] Oral

S (Solid Earth Sciences ) » S-VC Volcanology

[S-VC43] Magma crystallization, fragmentation, and their roles on volcanic eruption

convener:Takahiro Miwa(National research institute for earth science and disaster prevention), Satoshi Okumura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Pranabendu Moitra(University of Arizona)

Crystallization of magma during magma ascent in the conduit has a large impact on the dynamics of volcanic eruptions. Magma viscosity and brittleness increase with crystallization. This change of rheological properties may cause brittle fragmentation of low-viscosity basaltic magma during highly explosive subplinian and Plinian eruptions. On the other hand, crystallization may form rigid crystal frameworks, causing efficient outgassing through the interaction between the crystal frameworks and growing gas bubbles in ascending magma, resulting in effusive eruptions. This session aims to integrate information of elementary processes to develop physical models of multiphase magma ascent and eruption. In this view, we welcome innovative and multidisciplinary contributions from experimental volcanologists, numerical modelers, petrologists, and also geophysicists who develop and extend techniques to explore crystallization and bubble-crystal interactions, and their effects on fragmentation and outgassing of multiphase magma during effusive and explosive eruptions.

*Mike Burton1, Fabio Arzilli1, Giuseppe La Spina1, Margherita Polacci1, Nolwenn Le Gall2, Margaret Hartley1, Danilo Di Genova3, Biao Cai4, Nghia Vo5, Sara Nonni1, Robert Atwood5, Edward Llewellin6, Richard Brooker7, Heidy Mader7, Peter Lee2 (1.Department of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK, 2.Department of Mechanical Engineering, University College London, London, UK, 3.Institute of Non-Metallic Materials, Clausthal University of Technology, Zehntner Str. 2a, 38678 Clausthal-Zellerfeld, Germany, 4.School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK, 5.Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK, 6.Department of Earth Sciences, Durham University, Durham DH1 3LE, UK, 7.School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK)

*Kyungmin Kim1, Michihiko Nakamura1, Tomofumi Kozono2, Mitsuhiro Yoshimoto3 (1.Department of Earth Science, Graduate School of Science, Tohoku University, Sendai, Japan, 2.Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan, 3.Mount Fuji Research Institute, Yamanashi Prefecture Government, Japan)