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Goldschmidt 2014. 07a: Geochemical, Petrological, and Physical Controls on Arc Eruptions
From: Philipp Ruprecht <ruprecht@xxxxxxxxxxxxxxxxx>Goldschmidt 2014. 07a: Geochemical, Petrological, and Physical Controls on Arc Eruptions
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Dear colleagues,
Caroline Bouvet de Maissoneuve, Tom Shea, and I would like to draw your attention to session 07a: Geochemical, Petrological, and Physical Controls on Arc Eruptions at the 2014 Goldschmidt Meeting in Sacramento. The abstract deadline is approaching quickly: February 8; with abstract submission information available on the conference website (http://goldschmidt.info/2014/).
The keynote speaker will be Jessica Larsen from Alaska Volcano Observatory and the Univ. of Alaska, Fairbanks.
07a: Geochemical, Petrological, and Physical Controls on Arc Eruptions
Eruptions
at arc volcanoes vary widely in magnitude and in style from effusive
lavas and domes to explosive blasts and sustained plinian columns, and
eruptive activity can transition between end-member styles during a
single unrest period. Eruptive behavior is largely controlled by
processes affecting the magma system at depth. Arc magmas, initially
supplied from the mantle, often reside and evolve within the shallow
crust for extended times before their final ascent towards the surface,
during which they may crystallize, vesiculate, assimilate foreign
material, as well as mix with other magmas. Such processes constantly
redefine the physical state of magmas (geochemical constituency,
P-T-fO2 conditions, viscosity, and many more), which ultimately
determines their eruptive style (e.g. open vs. closed system behavior).
Outstanding issues remain unresolved for arc eruptions: What controls
open and closed-system behavior, and are there systematic transitions or
cycles between these modes? How frequently do recharge magmas perturb
evolving magma reservoirs and in what volumes? What are the timescales
required for eruption triggering and the associated processes? How
closely are degassing and crystallization linked in the reservoir and
during ascent? At which depth level is the fate of the eruption
determined – do conduit dynamics or the state of the magma prior to
ascend control the eruptive behavior? This session encourages diverse
contributions ranging from case studies of historic and prehistoric
eruption products to advanced numerical models of magma reservoirs,
conduits, and eruptions, with the unifying theme of seeking to
understand controls on arc eruptive styles.
Looking forward to seeing you in Sacramento and apologies for multiple postings,
Best regards,
Caroline, Tom and Philipp
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