************************************************************* From: Cynthia A Werner <cwerner@xxxxxxxx> ************************************************************* Colleagues: Please consider contributing to the following topical session, to be held at the 2009 Geological Society of America National Meeting, Portland, Oregon (USA), October 18-21, 2009. T63. Hydrothermal Systems and Volatile Emissions of Volcanic Arcs GSA Hydrogeology Division Description: 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. Convenors: Cynthia Werner, Shaul Hurwitz, Johan Varekamp, and Adam Simon Abstract deadline: August 11, 2009 To submit abstract, find session on this page: http://www.geosociety.org/meetings/2009/sessions/topical.asp?CatID=Hydrogeology&submit=Go 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. General Information: http://www.geosociety.org/meetings/2009/ ============================================================== 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. ==============================================================
