Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma
Abstract Explosivity in erupting volcanoes is controlled by the degassing dynamics and the viscosity of the ascending magma in the conduit. Magma crystallisation enhances both heterogeneous bubble nucleation and increases in magma bulk viscosity. Nanolite crystallisation has been suggested to enhanc...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-44850-x |
| _version_ | 1797349878034071552 |
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| author | Francisco Cáceres Kai-Uwe Hess Michael Eitel Markus Döblinger Kelly N. McCartney Mathieu Colombier Stuart A. Gilder Bettina Scheu Melanie Kaliwoda Donald B. Dingwell |
| author_facet | Francisco Cáceres Kai-Uwe Hess Michael Eitel Markus Döblinger Kelly N. McCartney Mathieu Colombier Stuart A. Gilder Bettina Scheu Melanie Kaliwoda Donald B. Dingwell |
| author_sort | Francisco Cáceres |
| collection | DOAJ |
| description | Abstract Explosivity in erupting volcanoes is controlled by the degassing dynamics and the viscosity of the ascending magma in the conduit. Magma crystallisation enhances both heterogeneous bubble nucleation and increases in magma bulk viscosity. Nanolite crystallisation has been suggested to enhance such processes too, but in a noticeably higher extent. Yet the precise causes of the resultant strong viscosity increase remain unclear. Here we report experimental results for rapid nanolite crystallisation in natural silicic magma and the extent of the subsequent viscosity increase. Nanolite-free and nanolite-bearing rhyolite magmas were subjected to heat treatments, where magmas crystallised or re-crystallised oxide nanolites depending on their initial state, showing an increase of one order of magnitude as oxide nanolites formed. We thus demonstrate that oxide nanolites crystallisation increases magma bulk viscosity mainly by increasing the viscosity of its melt phase due to the chemical extraction of iron, whereas the physical effect of particle suspension is minor, almost negligible. Importantly, we further observe that this increase is sufficient for driving magma fragmentation depending on magma degassing and ascent dynamics. |
| first_indexed | 2024-03-08T12:36:44Z |
| format | Article |
| id | doaj.art-b3cb2557194a4c2eb830534b4631399b |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-08T12:36:44Z |
| publishDate | 2024-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-b3cb2557194a4c2eb830534b4631399b2024-01-21T12:27:03ZengNature PortfolioNature Communications2041-17232024-01-0115111110.1038/s41467-024-44850-xOxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magmaFrancisco Cáceres0Kai-Uwe Hess1Michael Eitel2Markus Döblinger3Kelly N. McCartney4Mathieu Colombier5Stuart A. Gilder6Bettina Scheu7Melanie Kaliwoda8Donald B. Dingwell9Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Chemistry, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth Sciences, University of Hawai’i at ManoaDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU) MünchenAbstract Explosivity in erupting volcanoes is controlled by the degassing dynamics and the viscosity of the ascending magma in the conduit. Magma crystallisation enhances both heterogeneous bubble nucleation and increases in magma bulk viscosity. Nanolite crystallisation has been suggested to enhance such processes too, but in a noticeably higher extent. Yet the precise causes of the resultant strong viscosity increase remain unclear. Here we report experimental results for rapid nanolite crystallisation in natural silicic magma and the extent of the subsequent viscosity increase. Nanolite-free and nanolite-bearing rhyolite magmas were subjected to heat treatments, where magmas crystallised or re-crystallised oxide nanolites depending on their initial state, showing an increase of one order of magnitude as oxide nanolites formed. We thus demonstrate that oxide nanolites crystallisation increases magma bulk viscosity mainly by increasing the viscosity of its melt phase due to the chemical extraction of iron, whereas the physical effect of particle suspension is minor, almost negligible. Importantly, we further observe that this increase is sufficient for driving magma fragmentation depending on magma degassing and ascent dynamics.https://doi.org/10.1038/s41467-024-44850-x |
| spellingShingle | Francisco Cáceres Kai-Uwe Hess Michael Eitel Markus Döblinger Kelly N. McCartney Mathieu Colombier Stuart A. Gilder Bettina Scheu Melanie Kaliwoda Donald B. Dingwell Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma Nature Communications |
| title | Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma |
| title_full | Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma |
| title_fullStr | Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma |
| title_full_unstemmed | Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma |
| title_short | Oxide nanolitisation-induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma |
| title_sort | oxide nanolitisation induced melt iron extraction causes viscosity jumps and enhanced explosivity in silicic magma |
| url | https://doi.org/10.1038/s41467-024-44850-x |
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