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CO2 bubble generation and migration during magma-carbonate interaction
Stockholm University, Faculty of Science, Department of Geological Sciences. Centre for Experimental Mineralogy, Petrology, and Geochemistry (CEMPEG), Uppsala, Sweden.
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Number of Authors: 8
2015 (English)In: Contributions to Mineralogy and Petrology, ISSN 0010-7999, E-ISSN 1432-0967, Vol. 169, no 4, 42Article in journal (Refereed) Published
Abstract [en]

We conducted quantitative textural analysis of vesicles in high temperature and pressure carbonate assimilation experiments (1200 degrees C, 0.5 GPa) to investigate CO2 generation and subsequent bubble migration from carbonate into magma. We employed Mt. Merapi (Indonesia) and Mt. Vesuvius (Italy) compositions as magmatic starting materials and present three experimental series using (1) a dry basaltic-andesite, (2) a hydrous basaltic-andesite (2 wt% H2O), and (3) a hydrous shoshonite (2 wt% H2O). The duration of the experiments was varied from 0 to 300 s, and carbonate assimilation produced a CO2-rich fluid and CaO-enriched melts in all cases. The rate of carbonate assimilation, however, changed as a function of melt viscosity, which affected the 2D vesicle number, vesicle volume, and vesicle size distribution within each experiment. Relatively low-viscosity melts (i.e. Vesuvius experiments) facilitated efficient removal of bubbles from the reaction site. This allowed carbonate assimilation to continue unhindered and large volumes of CO2 to be liberated, a scenario thought to fuel sustained CO2-driven eruptions at the surface. Conversely, at higher viscosity (i.e. Merapi experiments), bubble migration became progressively inhibited and bubble concentration at the reaction site caused localised volatile over-pressure that can eventually trigger short-lived explosive outbursts. Melt viscosity therefore exerts a fundamental control on carbonate assimilation rates and, by consequence, the style of CO2-fuelled eruptions.

Place, publisher, year, edition, pages
2015. Vol. 169, no 4, 42
Keyword [en]
CO2, Carbonate assimilation, Melt viscosity, Bubble size distribution, Eruption style
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-126416DOI: 10.1007/s00410-015-1137-4ISI: 000367847900001OAI: oai:DiVA.org:su-126416DiVA: diva2:901387
Available from: 2016-02-08 Created: 2016-02-01 Last updated: 2016-02-08Bibliographically approved

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