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Magma decompression rate calculations with EMBER: A user‐friendly software to model diffusion of H 2 O, CO 2 and S in melt embayments

Abstract : Magma decompression rate is one of the most important parameters in controlling eruption dynamics. One way to determine decompression rate is by fitting a volatile elements diffusion profile to a concentration gradient in crystal-hosted embayments. Previous studies have used a variety of diffusion models, limiting the possibility for inter-study comparison. Here, we introduce EMBER (EMBayment-Estimated Rates), a standalone versatile tool that models diffusion of volatile elements along melt embayments. Our model relies on the pdepe function of MATLAB to calculate diffusion profiles of H2O, CO2 and S through the finite difference method. EMBER uses a grid search seeking out the best fits for decompression rates, initial dissolved concentration of each studied volatile and initial exsolved gas content, while setting three constants: temperature along the ascent and pressure at the beginning and end of the ascent. Our model can compute the rate for basaltic, intermediate, and rhyolitic compositions. We applied EMBER to previous studies to evaluate and validate our model. We then re-processed ”homogeneously” the raw data from the literature for a comparison. In other words, the same protocol was used for each diffusion profiles removing the literature-specific strategies used to constrain unknown parameters. With this comparison, we found a statistically significant positive correlation between maximum magma decompression rates and explosivity of the related eruption. EMBER is expected to help increase the number of volatile diffusion in embayments studies aiming at constraining magma decompression and ascent rates and to facilitate inter-study comparisons.
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https://hal.uca.fr/hal-03265994
Contributor : Sylvaine Jouhannel Connect in order to contact the contributor
Submitted on : Monday, June 21, 2021 - 1:33:24 PM
Last modification on : Tuesday, October 19, 2021 - 7:02:01 PM
Long-term archiving on: : Wednesday, September 22, 2021 - 6:36:42 PM

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Distributed under a Creative Commons Attribution 4.0 International License

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Guillaume Georgeais, Kenneth Koga, Yves Moussallam, Estelle Rose-Koga. Magma decompression rate calculations with EMBER: A user‐friendly software to model diffusion of H 2 O, CO 2 and S in melt embayments. Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2021, ⟨10.1029/2020GC009542⟩. ⟨hal-03265994⟩

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