EGU 2012 session 6b. The dynamics of volcanic excess degassing: from source to surface
From: Séverine Moune <S.Moune@xxxxxxxxxxxxxxxxxxxxxxx>
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"Dear Colleagues,
We would like to draw your attention to the following session at the Goldschmidt 2012 (Montreal, 24-29 June 2012). The abstract submission deadline is 1st February 2012.
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6b. The dynamics of volcanic excess degassing: from source to surface
Co-convenors:
Séverine Moune (Université Clermont-Ferrand) – s.mouneopgc.univ-bpclermont.fr
Glyn Williams-Jones (Simon Fraser University) - glynwjsfu.ca
Pierre Delmelle (Université de Louvain) -
pierre.delmelle@xxxxxxxxxxxx
Compared to rift- and hotspot-associated volcanism, it is common
in subduction zones to observe volcanoes that emit larger amounts
of gas than can be dissolved in the volume of erupted magma.
Combined with an understanding of the underlying mechanisms,
quantification of this so-called excess degassing during
explosive, effusive and non-eruptive activity provides valuable
insights into eruptive processes. Moreover, the dynamics of
eruptive processes are known to be linked to both the gas
composition in magmas and the physics of the degassing process
itself. Hence, a multi-disciplinary approach with measurements of
dissolved, exsolved and emitted magmatic volatiles should increase
our knowledge of eruptive dynamics. Thus, it is crucial to
integrate studies on the behaviour and transfer of volatile
components from their starting conditions in deep magmatic systems
(e.g., pre-eruptive content, volatile solubility) through ascent
in the volcanic conduit and release into the atmosphere (e.g. gas
composition and flux, ash-gas-aerosol interactions). Combining
these data with other modern geophysical methods (e.g. seismic and
IR measurements) and numerical modelling, will improve our
understanding of the dynamics of magmatic excess degassing. This
session aims to bring together geochemists, geophysicists,
petrologists, experimentalists and volcanologists to discuss their
latest results on volatiles and their escape from magma systems in
subduction zones.
Please contact the conveners (see above)
if you have any questions about this session."
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