******************************************
From:
David Pyle <David.Pyle@xxxxxxxxxxxxxx>
******************************************
I remind the Volcano List of a couple of sessions on Volatiles in
Magmatic Systems that will be on offer at the forthcoming Goldschmidt
meeting in Cologne from August 19-24, 2007. The abstract deadline is
April 19th; full details at http://www.goldschmidt2007.org/
S65: Water and volatiles in volcanic processes
Convener: David Pyle (David.Pyle@xxxxxxxxxxxxxx)
Keynote: Jon Blundy (Bristol)
Volatile constituents of melts and their source regions control the
formation, evolution and ultimate fate of magmas - whether erupted, or
not. But the eruptive products present us with a challenge since they
usually contain only residual traces of these fugitive species. We seek
contributions which shed light on any of the roles of volatiles in
volcanic processes; from studies of solidified volcanic products, to
measurements of gaseous emissions and models which seek to inform these
diverse approaches.
S45: Volcanic processes and volatiles in island arcs
Conveners: Alison Shaw (ashaw@xxxxxxxx)
Keynotes: Jon Blundy (Bristol, England), Paul Wallace
(Eugene, USA)
Various factors influence how materials are transferred through volcanic
arc systems; these include primary volatile contents, magmatic
differentiation, crystallization, degassing and magma ascent rates. This
symposium will focus on the mass transfer of magmas and volatiles in
subduction zones - from the zone of arc magma generation through to
eruption at the surface. Arc magmas span a wide compositional range
reflecting varying degrees of fractional crystallisation and magmatic
differentiation. Their composition plays an important role in
determining how they evolve during ascent or residence within crustal
reservoirs. Silica and volatile contents in particular will control
physical constraints on the mode of magma movement within the crust as
well as the eruption style (e.g., effusive vs. explosive). Rates of
cooling and degassing during ascent will also strongly affect the
magma's physical parameters through enhanced rates of crystallisation.
Finally, subsurface exsolution, fumarolic degassing and volatile release
during eruption are all important processes of subduction zone
magmatism. We welcome all contributions that address questions related
to mass transfer in subduction zone systems, considering all possible
scales from melt inclusions to global mass transfer budgets.
--------------------------------------------------
Dr David Pyle
Department of Earth Sciences
University of Oxford
Parks Rd, Oxford
OX1 3PR
UK
Tel +44 (0) 1865 272048
Fax +44 (0) 1865 272072
==============================================================
To unsubscribe from the volcano list, send the message:
signoff volcano
to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx
To contribute to the volcano list, send your message to:
volcano@xxxxxxxx Please do not send attachments.
==============================================================
