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GSA Session: T63. Hydrothermal Systems and Volatile Emissions of Volcanic Arcs
From: cwerner@xxxxxxxx
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Dear Colleagues:
The deadline of August 11, 2009 is fast approaching for the
2009 Geological Society of America National Meeting, to be held in,
Portland, Oregon (USA), October 18-21, 2009.
PLEASE CONSIDER CONTRIBUTING TO THE FOLLOWING TOPICAL SESSION
The deadline of August 11, 2009 is fast approaching for the
2009 Geological Society of America National Meeting, to be held in,
Portland, Oregon (USA), October 18-21, 2009.
PLEASE CONSIDER CONTRIBUTING TO THE FOLLOWING TOPICAL SESSION
T63. Hydrothermal Systems and Volatile Emissions of Volcanic Arcs
convenors: Cynthia Werner, Shaul Hurwitz, Johan Varekamp, Adam Simon
This session focuses on hydrothermal and volcanic emissions in volcanic
arcs, both subaerial and submarine. Topics include field studies,
experiments, and modeling related to volatile budgets,
magmatic/hydrothermal processes, groundwater flow/chemistry, and global
contributions. Oral.
arcs, both subaerial and submarine. Topics include field studies,
experiments, and modeling related to volatile budgets,
magmatic/hydrothermal processes, groundwater flow/chemistry, and global
contributions. Oral.
Invited contributors include:
Paul Wallace (U.Oregon)
Yuri Taran (UNAM)
Deb Bergfeld (USGS)
Rationale:
Volcanic arcs are the locus of significant heat and mass transfer between
shallow-level magma, the atmosphere, and hydrothermal systems. The
degassing of silicate melt at depth produces volatile emissions that
egress through the volcanic edifice either as focused fumaroles, diffuse
emission through soils, or condense into surface or subsurface waters,
sometimes resulting in significant hydrothermal systems. Quantification
of the volatile budgets of volcanoes within arcs will lead to a better
understanding of mantle vs. slab/seawater contributions in global volcanic
systems as well as the role of hydrology/hydrogeology in masking or
influencing magmatic processes (i.e., scrubbing of magmatic volatiles,
directing flow). Recent research and extensive mapping have also
highlighted the importance of submarine hydrothermal venting and the
global contribution of submarine volcanic arcs. Volcanic emissions also
make substantial contributions to toxic element budgets (e.g., As, Hg, B,
Li), and knowledge of these fluxes are of great importance to weigh the
severity of anthropogenic impacts on toxic element cycles. Finally,
assessing the timescales of magmatic degassing processes in arc settings
is important for understanding the transition from passive to eruptive
activity at arc volcanoes.
Volcanic arcs are the locus of significant heat and mass transfer between
shallow-level magma, the atmosphere, and hydrothermal systems. The
degassing of silicate melt at depth produces volatile emissions that
egress through the volcanic edifice either as focused fumaroles, diffuse
emission through soils, or condense into surface or subsurface waters,
sometimes resulting in significant hydrothermal systems. Quantification
of the volatile budgets of volcanoes within arcs will lead to a better
understanding of mantle vs. slab/seawater contributions in global volcanic
systems as well as the role of hydrology/hydrogeology in masking or
influencing magmatic processes (i.e., scrubbing of magmatic volatiles,
directing flow). Recent research and extensive mapping have also
highlighted the importance of submarine hydrothermal venting and the
global contribution of submarine volcanic arcs. Volcanic emissions also
make substantial contributions to toxic element budgets (e.g., As, Hg, B,
Li), and knowledge of these fluxes are of great importance to weigh the
severity of anthropogenic impacts on toxic element cycles. Finally,
assessing the timescales of magmatic degassing processes in arc settings
is important for understanding the transition from passive to eruptive
activity at arc volcanoes.
To submit to this session, follow the link on this page under T63.:
http://www.geosociety.org/meetings/2009/sessions/topical.asp
Cynthia Werner, Shaul Hurwitz, Johan Varekamp, and Adam Simon
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